Re: [Emc-users] Pittman BLDC + 7I39 experience?

2012-07-21 Thread Jon Elson
John Kasunich wrote:
> I recently picked up a couple Pittman ELCOM ST brushless servo motors.
> I haven't been able to find data for the exact part number, but
> everything
> appear to match up with the N2311 with 18.3V windings as described in
> this
> data sheet:
>
> www.control-drive.com/Products/Servo_Motors/PITTMAN/est_Brushless_2300.pdf
>
> The ones I have include both hall sensors (color code matches that
> datasheet)
> and a 1000 CPR encoder.
>
> I would like to drive them with a 5i20 and 7i39, and LinuxCNC's bldc HAL
> component.  I haven't really started digging into the docs yet, I was
> just
> wondering if anyone has any experience with these or similar motors.
>
> Thanks,
>   
I have had a Pittman 4443 motor on my minimill for several years.  It is 
the long, skinny
motor, not like the picture in your link.  I don't know if that makes 
any difference.
It works quite well with six-step drive.

Jon

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jon Elson
andy pugh wrote:
> On 21 July 2012 23:04, Jeshua Lacock  wrote:
>
>   
>> At 5cm/rev that is 547 IPM. I think I could happily live with that.
>> 
>
> That's a very high-lead ballscrew. I haven't seen any balls crews with
> a pitch twice the diameter. Are you sure you are not a factor of 10
> out?
>   
You can get high-lead ballscrews, but they are usually special-order 
items.  I have
some fairly small ballscrews with something like 20mm lead on my pick & 
place
machine (Yamaha/Philips).  They are over a meter long, so they were fighting
this exact problem.  This machine runs over a m/sec so they definitely 
run into
the danger region without a high-lead screw.

Jon

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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 23:09:13 Jason Burton did opine:

> What about torch heating the end and hot forging with the (cold) driver
> of your choice?
> 
Because the broach would be hot very fast.  This actually works fairly well 
cold except its pretty snug & I have to get serious to get it bounced back 
out.  I haven't checked the fit, but its possible the 3.5mm tool would make 
a socket that a 1/8 sae wrench would fit,  I may try that tomorrow & see 
how schloppy it is.

> Perhaps start with a full depth pilot hole so the forging tool doesn't
> have to displace as much material.

That 6 or 7mm I thought I ws drilling into it was plenty of clearance for 
the broach to displace the materiel in front of it.  The problem is that my 
mind was in mm's but the display was in inches and I had drilled about 3x 
deeper than I should have by the time I had the 'Duh' or senior moment.

The damage is done now, so all I can do is make another one.  Call it my 
Martian mistake. Mixing & matching inches & mm's is bad karma for me.
 
> You could then quench and temper to preference.

I don't have a real good way to heat.  Mapp gas I have, but with the dime 
store valves in those things its hopeless, can't be adjusted for a good 
flame.  I am a pretty good gas welder too but when I retired, somebody got 
away with the gas bottles I kept at the tv station to run my smith wrench 
with.  I have a mig kit too, but that doesn't lend itself to heating at all 
well either.

[...]

Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread Jason Burton
What about torch heating the end and hot forging with the (cold) driver of
your choice?

Perhaps start with a full depth pilot hole so the forging tool doesn't have
to displace as much material.

You could then quench and temper to preference.

Jason
 On Jul 21, 2012 9:32 PM, "Gene Heskett"  wrote:

> On Saturday 21 July 2012 22:14:28 Gene Heskett did opine:
>
> > On Saturday 21 July 2012 12:55:27 andy pugh did opine:
> > > On 21 July 2012 16:44, Gene Heskett  wrote:
> > > > And I just now did hit a page with some size specs.  Looks like T15
> > > > is as big as I can shoot for.  The thru hole in the extension is a
> > > > good fit for a 3.5 mm allen wrench.
> > >
> > > Broach it hex then, it can't be _that_ hard.
> > > Just don't do your real part first.
> >
> > A given.  I'll cut off half an inch of this drill rod and try that 2nd.
> > First will be a piece of hard plastic like micarta.
> >
> > Cheers, Gene
>
> I got it done, not once but twice, second time in the real screw.  Then I
> did a boo-boo after making a 7mm tapped pocket to hold the screw, I mounted
> the drill bit, dropping its diameter about 6 thou, and thinking in mm that
> I needed to drill maybe 7mm into the end of it, zeroed the z without
> checking to see if it really was, fed the bit in, glance at the dro
> occasionally but always seeing it as -2.something, so I kept on boring.
>
> When I realized the display was in inches and that there must have been a
> previous touch off in effect.  The net effect is that I bored to far and
> broke the screw at the size change.
>
> That made it beer thirty & I was one behind.  My biggest problem was that
> 3.5mm wrench, is damned near made out of unobtainium, I check Advance Auto,
> TSC and finally found 2 pocket kits at Lowes with a 3.5mm.  That turned out
> to be damned hard stuff, and my lathe drove it in 4 to 5mm very easily with
> about a 1/8" tail stock offset.  Veddy tight though, took a pair of BIG
> vice grips and a hammer to remove the key piece both times.  Without
> resorting to driving it back in with a hammer, it only goes back in about
> 1mm.
>
> So, I guess tomorrow I re-rig and sharpen my thread cutter, and make
> another screw.  Then its probably going to slow for a day or 3 because I
> have no clue how much nose I'll come home with Monday.  Squamus Cell they
> called them this time.  Several small ones.
>
> Cheers, Gene
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> My web page:  is up!
> Minimum charge for booths.
>
>
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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 22:14:28 Gene Heskett did opine:

> On Saturday 21 July 2012 12:55:27 andy pugh did opine:
> > On 21 July 2012 16:44, Gene Heskett  wrote:
> > > And I just now did hit a page with some size specs.  Looks like T15
> > > is as big as I can shoot for.  The thru hole in the extension is a
> > > good fit for a 3.5 mm allen wrench.
> > 
> > Broach it hex then, it can't be _that_ hard.
> > Just don't do your real part first.
> 
> A given.  I'll cut off half an inch of this drill rod and try that 2nd.
> First will be a piece of hard plastic like micarta.
> 
> Cheers, Gene

I got it done, not once but twice, second time in the real screw.  Then I 
did a boo-boo after making a 7mm tapped pocket to hold the screw, I mounted 
the drill bit, dropping its diameter about 6 thou, and thinking in mm that 
I needed to drill maybe 7mm into the end of it, zeroed the z without 
checking to see if it really was, fed the bit in, glance at the dro 
occasionally but always seeing it as -2.something, so I kept on boring.

When I realized the display was in inches and that there must have been a 
previous touch off in effect.  The net effect is that I bored to far and 
broke the screw at the size change.

That made it beer thirty & I was one behind.  My biggest problem was that 
3.5mm wrench, is damned near made out of unobtainium, I check Advance Auto, 
TSC and finally found 2 pocket kits at Lowes with a 3.5mm.  That turned out 
to be damned hard stuff, and my lathe drove it in 4 to 5mm very easily with 
about a 1/8" tail stock offset.  Veddy tight though, took a pair of BIG 
vice grips and a hammer to remove the key piece both times.  Without 
resorting to driving it back in with a hammer, it only goes back in about 
1mm.

So, I guess tomorrow I re-rig and sharpen my thread cutter, and make 
another screw.  Then its probably going to slow for a day or 3 because I 
have no clue how much nose I'll come home with Monday.  Squamus Cell they 
called them this time.  Several small ones.

Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page:  is up!
Minimum charge for booths.

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread John Kasunich
The idler pulleys push them together on either side of the pinion,
which is where the force is transferred from the upper belt to
the lower one.  The lower one is glued to the machine frame along
its entire length, so the force is then transferred to the frame.
Neither belt has any significant tension outside the area of the
idlers, so there isn't much needed to keep them together - gravity
does it.

I don't think it would work with regular trapezoidal timing belts
(like the MXK, XL, L, etc series), because the teeth are smaller
than the spaces between the teeth.  So they belts wouldn't mesh
tightly.  A GT or HTD belt might do better, I haven't looked up
those belt profiles to see if they would provide a positive mesh.

Thinking about it a bit, maybe even trapezoid belts would work.
The teeth on the upper belt don't need to be centered in the
spaces on the lower belt.  On the left side of the drive unit,
the right flank of the upper belt tooth could be in contact
with the left flank of the lower belt tooth, so it could transfer
tension to the lower belt.  On the right side of the drive unit
things are reversed, with the left flank of the upper tooth in
contact with the right flank of the lower tooth.  Again, it can
transfer tension to the lower belt.

The main problem is that force is transferred between belts by
only one or two teeth - the ones directly under the idler pulleys.
Making the idler pulleys as large as possible would improve that
a bit.  It all comes down to how much force is needed, and how
expensive is strong, wide belting compared to alternative ways
of doing the same thing (like rack and pinion).

By comparison, if you used only the upper belt, and stretched
it tight enough that both sides were under tension loading
even with maximum force on the carriage, it would be stronger
(load limited by the teeth in mesh over 180 degrees of pinion)
but springier (tension members of the belt are long and thin,
and even if steel they are elastic).  But you have to buy half
as much belting, so the belting could be bigger.

It would be an interesting design exercise.  Econobelt and
SDP-SI are both belt suppliers with a good bit of technical
info on their sites.  The ultimate choice depends on your
requirements.  If you have lots of cutting force, rack and
pinion would probably be better.  If you need speed and low
noise and not so much stiffness, a single timing belt with
two idlers and a pinion would be better.  The interlocking
belt thing is weaker than both, I think, but much stiffer
than the single belt.



On Sat, Jul 21, 2012, at 07:38 PM, Jeshua Lacock wrote:
> 
> On Jul 21, 2012, at 6:47 PM, Peter C. Wallace wrote:
> 
> > Ahh here it is:
> > 
> > http://bell-everman.com/products/linear-positioning/servobelt-linear-sbl
> 
> Thats pretty cool.
> 
> I wonder what keeps the belts together? Gravity?
> 
> 
> Cheers,
> 
> Jeshua Lacock
> Founder/Engineer
> 3DTOPO Incorporated
> 
> Phone: 208.462.4171
> 
> 
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  jmkasun...@fastmail.fm


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jeshua Lacock

On Jul 21, 2012, at 6:47 PM, Peter C. Wallace wrote:

> Ahh here it is:
> 
> http://bell-everman.com/products/linear-positioning/servobelt-linear-sbl

Thats pretty cool.

I wonder what keeps the belts together? Gravity?


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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[Emc-users] Pittman BLDC + 7I39 experience?

2012-07-21 Thread John Kasunich
I recently picked up a couple Pittman ELCOM ST brushless servo motors.
I haven't been able to find data for the exact part number, but
everything
appear to match up with the N2311 with 18.3V windings as described in
this
data sheet:

www.control-drive.com/Products/Servo_Motors/PITTMAN/est_Brushless_2300.pdf

The ones I have include both hall sensors (color code matches that
datasheet)
and a 1000 CPR encoder.

I would like to drive them with a 5i20 and 7i39, and LinuxCNC's bldc HAL
component.  I haven't really started digging into the docs yet, I was
just
wondering if anyone has any experience with these or similar motors.

Thanks,
-- 
  John Kasunich
  jmkasun...@fastmail.fm


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread John Kasunich
I also remembered seeing a more commercial version of that somewhere,
but like you I couldn't find it.  When I found that forum post I stopped
looking :)

On Sat, Jul 21, 2012, at 05:47 PM, Peter C. Wallace wrote:
> >
> > Theres a commercial version of this or something very close (with I think 
> > special belts) but my google foo is failing me now
> >
> > Peter Wallace
> > Mesa Electronics
> >
> Ahh here it is:
> 
> http://bell-everman.com/products/linear-positioning/servobelt-linear-sbl
> 
> 
> Peter Wallace
> Mesa Electronics
> 
> 
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Peter C. Wallace
>
> Theres a commercial version of this or something very close (with I think 
> special belts) but my google foo is failing me now
>
> Peter Wallace
> Mesa Electronics
>
Ahh here it is:

http://bell-everman.com/products/linear-positioning/servobelt-linear-sbl


Peter Wallace
Mesa Electronics


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Peter C. Wallace

On Sat, 21 Jul 2012, John Kasunich wrote:


Date: Sat, 21 Jul 2012 20:24:22 -0400
From: John Kasunich 
Reply-To: "Enhanced Machine Controller (EMC)"

To: "Enhanced Machine Controller (EMC)" 
Subject: Re: [Emc-users] [Off] Ballscrew Support?




On Sat, Jul 21, 2012, at 06:04 PM, Jeshua Lacock wrote:


Damn. Anyone want to buy two brand new ballscrews?

:D

Maybe I will use them on a laser cutter instead. High speed is not as
important to me on a laser cutter as it is on a 3D milling machine. Path
lengths are *much* longer doing 3D stuff versus 2D cutting??.

Maybe I will use timing belts for this machine. Just seems like they will
have a lot of flex over a 10 foot span. Chain drive?



I saw an idea once that attempted to solve the problem of timing belt
stretch by attaching one belt along its full length to the machine
frame, then meshing another belt to that one to drive the axis.
A picture is worth a thousand words, see this posting:

http://www.mycncuk.com/forums/showthread.php/1599-Planning-and-build-of-my-8020-aluminium-CNC-Router?p=10463&viewfull=1#post10463

It essentially becomes a rack-and-pinion of sorts.  I didn't read that
full thread to see if he actually built the machine, and how it worked
out.  I think I also saw the same idea discussed on CNCzone.

Of course, you could also just go the rack-and-pinion route.
The rack teeth should point down to shed dirt and chips.

--
 John Kasunich
 jmkasun...@fastmail.fm



Theres a commercial version of this or something very close (with I think 
special belts) but my google foo is failing me now


Peter Wallace
Mesa Electronics
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jeshua Lacock

On Jul 21, 2012, at 6:24 PM, John Kasunich wrote:

> n Sat, Jul 21, 2012, at 06:04 PM, Jeshua Lacock wrote:
>> 
>> Damn. Anyone want to buy two brand new ballscrews?
>> 
>> :D
>> 
>> Maybe I will use them on a laser cutter instead. High speed is not as
>> important to me on a laser cutter as it is on a 3D milling machine. Path
>> lengths are *much* longer doing 3D stuff versus 2D cutting….
>> 
>> Maybe I will use timing belts for this machine. Just seems like they will
>> have a lot of flex over a 10 foot span. Chain drive?
> 
> I saw an idea once that attempted to solve the problem of timing belt
> stretch by attaching one belt along its full length to the machine
> frame, then meshing another belt to that one to drive the axis.
> A picture is worth a thousand words, see this posting:
> 
> http://www.mycncuk.com/forums/showthread.php/1599-Planning-and-build-of-my-8020-aluminium-CNC-Router?p=10463&viewfull=1#post10463
> 
> It essentially becomes a rack-and-pinion of sorts.  I didn't read that
> full thread to see if he actually built the machine, and how it worked
> out.  I think I also saw the same idea discussed on CNCzone.

Interesting. 

Yeah, looks like he never built it - or at least reported back.

> Of course, you could also just go the rack-and-pinion route.
> The rack teeth should point down to shed dirt and chips.

I don't recall the specifics, but I read somewhere that rack-and-pinon was not 
a good solution. Maybe it had something to do with resonance?


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jeshua Lacock

On Jul 21, 2012, at 5:49 PM, andy pugh wrote:

> On 21 July 2012 23:04, Jeshua Lacock  wrote:
> 
>> At 5cm/rev that is 547 IPM. I think I could happily live with that.
> 
> That's a very high-lead ballscrew. I haven't seen any balls crews with
> a pitch twice the diameter. Are you sure you are not a factor of 10
> out?

Hm...

It looks like if have a sliding support like you suggested trailing on either 
side of the ball screw by 38 inches that would allow me to get up to 1113 RPM 
which would give me a pretty respectable 388 IPM….


Best,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Greg Bernard
Have you considered rack and pinion for your machine. CNCrouterparts has a very 
affordable solution: 
http://www.cncrouterparts.com/rack-and-pinion-drive-nema-34-p-80.htmlI've not 
used them but they have gotten good reviews from users at CNCzone and I've been 
happy with other components of theirs I've used on my machine. 

 
+++
We are like tenant farmers chopping down the fence around our house for 
fuel when we should be using Nature's inexhaustible sources of energy -- sun, 
wind and tide. ... I'd put my money on the sun and solar energy. 
What a source of power! I hope we don't have to wait until oil and coal 
run out before we tackle that. -Thomas Edison, inventor (1847-1931) 



>
> From: Jeshua Lacock 
>To: Enhanced Machine Controller (EMC)  
>Sent: Saturday, July 21, 2012 7:04 PM
>Subject: Re: [Emc-users] [Off] Ballscrew Support?
> 
>
>On Jul 21, 2012, at 5:49 PM, andy pugh wrote:
>
>> On 21 July 2012 23:04, Jeshua Lacock  wrote:
>> 
>>> At 5cm/rev that is 547 IPM. I think I could happily live with that.
>> 
>> That's a very high-lead ballscrew. I haven't seen any balls crews with
>> a pitch twice the diameter. Are you sure you are not a factor of 10
>> out?
>
>That is funny - at the same time you must have been thinking of this, I was 
>double checking it!
>
>The specs said the lead was 5. I had assumed 5cm - in fact it is only 5mm! 
>Doh! So you are correct - off by a factor of 10!
>
>To make matters worse, I thought they were 25mm, but they are 20mm.
>
>So that drops the safe speed down to a miserable 43.89 IPM.
>
>:'(
>
>Damn. Anyone want to buy two brand new ballscrews?
>
>:D
>
>Maybe I will use them on a laser cutter instead. High speed is not as 
>important to me on a laser cutter as it is on a 3D milling machine. Path 
>lengths are *much* longer doing 3D stuff versus 2D cutting….
>
>Maybe I will use timing belts for this machine. Just seems like they will have 
>a lot of flex over a 10 foot span. Chain drive?
>
>
>Cheers,
>
>Jeshua Lacock
>Founder/Engineer
>3DTOPO Incorporated
>
>Phone: 208.462.4171
>
>
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread John Kasunich


On Sat, Jul 21, 2012, at 06:04 PM, Jeshua Lacock wrote:
> 
> Damn. Anyone want to buy two brand new ballscrews?
> 
> :D
> 
> Maybe I will use them on a laser cutter instead. High speed is not as
> important to me on a laser cutter as it is on a 3D milling machine. Path
> lengths are *much* longer doing 3D stuff versus 2D cutting….
> 
> Maybe I will use timing belts for this machine. Just seems like they will
> have a lot of flex over a 10 foot span. Chain drive?

I saw an idea once that attempted to solve the problem of timing belt
stretch by attaching one belt along its full length to the machine
frame, then meshing another belt to that one to drive the axis.
A picture is worth a thousand words, see this posting:

http://www.mycncuk.com/forums/showthread.php/1599-Planning-and-build-of-my-8020-aluminium-CNC-Router?p=10463&viewfull=1#post10463

It essentially becomes a rack-and-pinion of sorts.  I didn't read that
full thread to see if he actually built the machine, and how it worked
out.  I think I also saw the same idea discussed on CNCzone.

Of course, you could also just go the rack-and-pinion route.
The rack teeth should point down to shed dirt and chips.

-- 
  John Kasunich
  jmkasun...@fastmail.fm


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jeshua Lacock

On Jul 21, 2012, at 5:49 PM, andy pugh wrote:

> On 21 July 2012 23:04, Jeshua Lacock  wrote:
> 
>> At 5cm/rev that is 547 IPM. I think I could happily live with that.
> 
> That's a very high-lead ballscrew. I haven't seen any balls crews with
> a pitch twice the diameter. Are you sure you are not a factor of 10
> out?

That is funny - at the same time you must have been thinking of this, I was 
double checking it!

The specs said the lead was 5. I had assumed 5cm - in fact it is only 5mm! Doh! 
So you are correct - off by a factor of 10!

To make matters worse, I thought they were 25mm, but they are 20mm.

So that drops the safe speed down to a miserable 43.89 IPM.

:'(

Damn. Anyone want to buy two brand new ballscrews?

:D

Maybe I will use them on a laser cutter instead. High speed is not as important 
to me on a laser cutter as it is on a 3D milling machine. Path lengths are 
*much* longer doing 3D stuff versus 2D cutting….

Maybe I will use timing belts for this machine. Just seems like they will have 
a lot of flex over a 10 foot span. Chain drive?


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread andy pugh
On 21 July 2012 23:04, Jeshua Lacock  wrote:

> At 5cm/rev that is 547 IPM. I think I could happily live with that.

That's a very high-lead ballscrew. I haven't seen any balls crews with
a pitch twice the diameter. Are you sure you are not a factor of 10
out?

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Jon Elson
Kent A. Reed wrote:
> Rather, I'd have to ask what else was changed when the Axiom card was 
> installed?  Call me an ornery cuss, but I suspect changes were made to 
> configuration files that interfere with Axis starting.
>   
Well, a very easy way to test it is to try to run glxgears.  That may 
even produce a
useful message.  If glxgears runs and displays some animated spinning 
gears, then
opengl is working correctly.  If it doesn't, that is a very strong 
indication that
opengl or the mesa emulation is not working.

Can you pull this graphics card back out and see how it works?

Jon

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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Jon Elson
Eric Keller wrote:
> I'm guessing it has something to do with the real-time system not starting,
> but who knows?  In general, being able to diagnose using dmesg first
> requires that one get used to seeing the output of dmesg.
>   
OK, well, to us LinuxCNC insiders, Axis not starting is different from 
LinuxCNC not
starting.  There certainly will be different error messages, although 
the outward
symptoms might look pretty much the same.  So, yes, we need the OP to be as
specific as he can be.

Jon

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Steve Blackmore
On Sat, 21 Jul 2012 14:41:01 +0300, you wrote:

>2012/7/21 Erik Christiansen :
>>
>> In any event, I'd fix a long slender ballscrew, to avoid whipping, and
>> rotate the nut.
>
>I did this on the last machine I built with this exact intention in my mind.
>The overall result - failure. I seriously doubt I will ever do that again.
>Longest screw was 2800 mm long (other 2 were 1800 mm long), all of
>them - 16 mm diameter, 10 mm pitch.

Yea - too small a diameter screw for decent performance at that length.

I have a 2.5m ballscrew here that came off a laser cutter. Now bear in
mind there are no cutting forces involved, it was off the Y axis and
only moving the head across the gantry. It's 32mm diameter and has large
bearing blocks and preload adjustment on both ends. Also has two ball
nuts for backlash adjustment :)

I also have another 32mm one that was an unused spare off a Denford CNC
lathe - it's only got about 300 mm of travel but was designed to be
fixed at one end only - hence the diameter.

They were destined for a slant bed lathe I designed but I never got
around to building it .

Steve Blackmore
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Re: [Emc-users] C Compiler - MPLAB

2012-07-21 Thread Cathrine Hribar



On Sat, 21 Jul 2012 17:15:32 -0400
  "Kent A. Reed"  wrote:
> On 7/21/2012 4:46 PM, Cathrine Hribar wrote:
>>
>>
>> On Fri, 20 Jul 2012 23:07:09 -0400
>>"Kent A. Reed"  wrote:
>>> On 7/20/2012 10:10 PM, Cathrine Hribar wrote:
 On Mon, 16 Apr 2012 14:47:49 -0400
 Erik Friesen  wrote:
> On Mon, Apr 16, 2012 at 2:33 PM, Dave  wrote:
>
>> On 4/16/2012 1:15 PM, Erik Friesen wrote:
>> http://embeddedfun.blogspot.com/2011/05/installing-mplabx-on-ubuntu-1104.html
>>> ...
>>>
 Hi Erik:

 Well I have MPLAB-X running on Ubuntu 11.10, thanks to you.

 My problem is that I still can't get my pickit2 to be seen by MPLABX.  It 
 is
 listed, along with Pickit3, in the Tool Selector list under Project
 Properties.

 The Pickit 2 shows up with two yellow dots in front but the Pickit 3 shows
 up
 with two red dots.

 According to the talk on Embedded Fun site, that means that Java don't have
 all the 32bit libraries it needs to support the pk2.

 Anyway, I thought I would download the libraries with "sudo apt-get install
 ia32-libs. That's the command they gave on the site anyway.

 Well of course, it didn't work.  The flag comes back, "file deleted or
 missing."  Can you suggest any other place I can find these 32bit 
 libraries?

 Bill

>>> Bill:
>>>
>>> I haven't tried this myself, but I see a link to downloadable files for
>>> Oneric Ocelot (e.g., Ubuntu 11.10) on
>>> https://launchpad.net/ubuntu/+source/ia32-libs
>>>
>>> Regards,
>>> Kent
>>>
>> Hi Kent:
>> Thanks for the info.  Went to the site and downloaded some stuff, will see
>> what I get.
>>
>> Bill
>>
> 
> Bill, I didn't ask if you are running a 32-bit or 64-bit version of 
> Ubuntu. (I don't actually want to know but) I noticed that somewhere 
> along the timeline of the 11.x releases of Ubuntu there was a 
> repackaging of the ia32-libs; for example there is now metapackage 
> ia32-libs-multiarch. I don't pretend to understand what was done but 
> apparently it is supposed to help one deal with the differences between 
> the two platforms. Only you can judge.
> 
> I agree with Erik Friesen that you're much more likely to get good 
> answers by posting these questions to the appropriate microchip forum. 
> They may not know LinuxCNC but they know tons more that we do about 
> MPLABX and about using it on Ubuntu.
> 
> Hope your board lights up soon.
> 
> Regards,
> Kent
> 
Thanks Kent for the update.

will look at that.

I bought the Pickit2 before I started with MPLABX.  They said that it would 
run on mt Windows 2000. Not!

I will get a Pickit3 sometime in future.  Don't have much confidence in this 
as of yet!!\\Bill
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jeshua Lacock

On Jul 21, 2012, at 9:50 AM, Jon Elson wrote:

> Jeshua Lacock wrote:
>> 
>> It looks like over a 10 foot span I have about 24mm (0.96 inches) of sag in 
>> the middle. 
>> 
> 10 foot span?  25 mm diameter?  Oh, my, that sounds WAY past the safe range.
> See http://www.nookindustries.com/ball/BallCalculators.cfm#CriticalSpeed
> for a critical speed calculator.  With the stiffest fixing of the ends, 
> you might
> be able to get 500 RPM safely.  That would be 100 IPM with a 5 TPI screw.
> With a coarser leadscrew pitch, you don't ned as high an RPM, so maybe
> this will be OK.

Thanks everyone for all the very useful information!!! Most of the information 
I had no idea about!

And thanks for the calculator Jon. Using End Fixity B (one end double bearing 
the other single bearing) for 117 inch span I get a safe RPM of 278.

At 5cm/rev that is 547 IPM. I think I could happily live with that. More 
important than top end speed to me is how fast the table can accelerate. And 
for a 250+ pound table 547 IPM rapids seems pretty decent to me. This axis is 
also going to be the slowest, so for raster scanning I can move more rapidly on 
the Y axis.

If I had double bearing on both sides (End Fixity C), I would get to 805 IPM 
and with End Fixity D I would get to 1220 IPM. Unfortunately, I think that 
would require taking the ballscrews to a machine shop. I guess if I ever want 
faster top end speed that is an option. 


Thanks again,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Kent A. Reed
On 7/21/2012 5:24 PM, Dave Keeton wrote:
> ...
>
> Sorry if I caused such an uproar just asking a simple question! GEEEZ
> Guys! Just kidding.Yes I should have given more info as I knew
> better being a service tech for CNC machines myself. Sorry, it wont
> happen again! Turns out that long before I installed the Axiom card I
> removed a Visiontek ATI X1300 graphics card and forgot to remove all of
> the drivers and ATI Catalyst software. I installed the Axiom DIO card
> yesterday. The Axis GUI worked up until that point then everything went
> haywire and the only GUI that would work was tkemc. I removed the ATI
> drivers and Axis started working again as well as the Axiom card. The
> computer is a rack mount single board with an ISA/PCI backplane. The CPU
> is a pentium 4 2.4 Ghz with 2 Gig of ram. Currently using the embedded
> graphics port.
>
> Sorry for the trouble and please don't spankenz me with that hair brush
> again! ;-)
>
> Dave
>
>

Boy, if only I had a nickel for every time I heard the old "I forgot to 
remove the old drivers" :-)

It should be obvious that in the absence of facts we are perfectly happy 
to make up scenarios out of whole cloth.

Glad it's working now. Like the man said, all's well that ends well.

Regards,
Kent


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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Dave Keeton
On Sat, 2012-07-21 at 17:02 -0400, Kent A. Reed wrote:
> On 7/21/2012 12:38 PM, Dave Keeton wrote:
> > All,
> >I installed a Axiom ax5214h card in my control. Since doing this
> > the Axis GUI will not start up in my config. TKEMC runs fine. Any help
> > would be appreciated.
> >
> > Dave
> >
> >
> 
> Dave:
> 
> You've got a lively side-bar exchange going among Andy, Eric, and me.
> 
> My interpretation of your first message seems to be the most limited in 
> that I infer everything including Axis was "working" until you added the 
> Axiom I/O board. Andy's interpretation would mean Axis never worked. 
> Eric's would mean LinuxCNC itself is failing to start. We need you to 
> provide more information :-)
> 
> Which version of LinuxCNC? Which version of Ubuntu? Which motherboard, 
> cpu, graphics subsystem, etc.?
> 
> Is it a straight-forward install from the LinuxCNC distribution/LiveCD 
> or have you customized it?
> 
> Under what circumstances, if any, have you ever had Axis running in this 
> system?
> 
> Does glxgears run and display spinning meshed gears?
> 
> Does the output from dmesg contain any suggestive messages (no, not that 
> kind of suggestive)?
> 
> 
> I'm sorry for the curtness of my first response. I was trying to get 
> some online financial business done before my credit union shut down its 
> site for maintenance this weekend (nope; they pulled the plug before I 
> could get finished). I realize now that my appended anecdote looks 
> pretty snarky. I should have sent it separately since I have been 
> reminded of the experience by any number of discussion threads. Don't 
> take it to heart. I actually assumed you were doing pretty well since 
> you could make TkEMC to run in place of Axis. LinuxCNC can be a bear to 
> configure with so many possible variations in hardware and interfaces. 
> Everyone of us has had days where we're stumped.
> 
> Regards,
> Kent
> 
> 
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Sorry if I caused such an uproar just asking a simple question! GEEEZ
Guys! Just kidding.Yes I should have given more info as I knew
better being a service tech for CNC machines myself. Sorry, it wont
happen again! Turns out that long before I installed the Axiom card I
removed a Visiontek ATI X1300 graphics card and forgot to remove all of
the drivers and ATI Catalyst software. I installed the Axiom DIO card
yesterday. The Axis GUI worked up until that point then everything went
haywire and the only GUI that would work was tkemc. I removed the ATI
drivers and Axis started working again as well as the Axiom card. The
computer is a rack mount single board with an ISA/PCI backplane. The CPU
is a pentium 4 2.4 Ghz with 2 Gig of ram. Currently using the embedded
graphics port.

Sorry for the trouble and please don't spankenz me with that hair brush
again! ;-)

Dave



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Re: [Emc-users] C Compiler - MPLAB

2012-07-21 Thread Kent A. Reed
On 7/21/2012 4:46 PM, Cathrine Hribar wrote:
>
>
> On Fri, 20 Jul 2012 23:07:09 -0400
>"Kent A. Reed"  wrote:
>> On 7/20/2012 10:10 PM, Cathrine Hribar wrote:
>>> On Mon, 16 Apr 2012 14:47:49 -0400
>>> Erik Friesen  wrote:
 On Mon, Apr 16, 2012 at 2:33 PM, Dave  wrote:

> On 4/16/2012 1:15 PM, Erik Friesen wrote:
> http://embeddedfun.blogspot.com/2011/05/installing-mplabx-on-ubuntu-1104.html
>> ...
>>
>>> Hi Erik:
>>>
>>> Well I have MPLAB-X running on Ubuntu 11.10, thanks to you.
>>>
>>> My problem is that I still can't get my pickit2 to be seen by MPLABX.  It is
>>> listed, along with Pickit3, in the Tool Selector list under Project
>>> Properties.
>>>
>>> The Pickit 2 shows up with two yellow dots in front but the Pickit 3 shows
>>> up
>>> with two red dots.
>>>
>>> According to the talk on Embedded Fun site, that means that Java don't have
>>> all the 32bit libraries it needs to support the pk2.
>>>
>>> Anyway, I thought I would download the libraries with "sudo apt-get install
>>> ia32-libs. That's the command they gave on the site anyway.
>>>
>>> Well of course, it didn't work.  The flag comes back, "file deleted or
>>> missing."  Can you suggest any other place I can find these 32bit libraries?
>>>
>>> Bill
>>>
>> Bill:
>>
>> I haven't tried this myself, but I see a link to downloadable files for
>> Oneric Ocelot (e.g., Ubuntu 11.10) on
>> https://launchpad.net/ubuntu/+source/ia32-libs
>>
>> Regards,
>> Kent
>>
> Hi Kent:
> Thanks for the info.  Went to the site and downloaded some stuff, will see
> what I get.
>
> Bill
>

Bill, I didn't ask if you are running a 32-bit or 64-bit version of 
Ubuntu. (I don't actually want to know but) I noticed that somewhere 
along the timeline of the 11.x releases of Ubuntu there was a 
repackaging of the ia32-libs; for example there is now metapackage 
ia32-libs-multiarch. I don't pretend to understand what was done but 
apparently it is supposed to help one deal with the differences between 
the two platforms. Only you can judge.

I agree with Erik Friesen that you're much more likely to get good 
answers by posting these questions to the appropriate microchip forum. 
They may not know LinuxCNC but they know tons more that we do about 
MPLABX and about using it on Ubuntu.

Hope your board lights up soon.

Regards,
Kent


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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Dave Keeton
On Sat, 2012-07-21 at 17:45 +0100, andy pugh wrote:
> On 21 July 2012 17:38, Dave Keeton  wrote:
> > All,
> >   I installed a Axiom ax5214h card in my control. Since doing this
> > the Axis GUI will not start up in my config. TKEMC runs fine. Any help
> > would be appreciated.
> 
> Probably a graphics card or opengl issue, there are possible solutions
> to both issues here:
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?TroubleShooting#Display_Issues
> 


  Thanks! Turns out it was an active driver from my old video card
that had been removed a while back. All is good now!

Dave



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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Kent A. Reed
On 7/21/2012 12:38 PM, Dave Keeton wrote:
> All,
>I installed a Axiom ax5214h card in my control. Since doing this
> the Axis GUI will not start up in my config. TKEMC runs fine. Any help
> would be appreciated.
>
> Dave
>
>

Dave:

You've got a lively side-bar exchange going among Andy, Eric, and me.

My interpretation of your first message seems to be the most limited in 
that I infer everything including Axis was "working" until you added the 
Axiom I/O board. Andy's interpretation would mean Axis never worked. 
Eric's would mean LinuxCNC itself is failing to start. We need you to 
provide more information :-)

Which version of LinuxCNC? Which version of Ubuntu? Which motherboard, 
cpu, graphics subsystem, etc.?

Is it a straight-forward install from the LinuxCNC distribution/LiveCD 
or have you customized it?

Under what circumstances, if any, have you ever had Axis running in this 
system?

Does glxgears run and display spinning meshed gears?

Does the output from dmesg contain any suggestive messages (no, not that 
kind of suggestive)?


I'm sorry for the curtness of my first response. I was trying to get 
some online financial business done before my credit union shut down its 
site for maintenance this weekend (nope; they pulled the plug before I 
could get finished). I realize now that my appended anecdote looks 
pretty snarky. I should have sent it separately since I have been 
reminded of the experience by any number of discussion threads. Don't 
take it to heart. I actually assumed you were doing pretty well since 
you could make TkEMC to run in place of Axis. LinuxCNC can be a bear to 
configure with so many possible variations in hardware and interfaces. 
Everyone of us has had days where we're stumped.

Regards,
Kent


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Re: [Emc-users] C Compiler - MPLAB

2012-07-21 Thread Cathrine Hribar



On Fri, 20 Jul 2012 23:07:09 -0400
  "Kent A. Reed"  wrote:
> On 7/20/2012 10:10 PM, Cathrine Hribar wrote:
>>
>> On Mon, 16 Apr 2012 14:47:49 -0400
>>Erik Friesen  wrote:
>>> On Mon, Apr 16, 2012 at 2:33 PM, Dave  wrote:
>>>
 On 4/16/2012 1:15 PM, Erik Friesen wrote:
 http://embeddedfun.blogspot.com/2011/05/installing-mplabx-on-ubuntu-1104.html
> ...
>
>> Hi Erik:
>>
>> Well I have MPLAB-X running on Ubuntu 11.10, thanks to you.
>>
>> My problem is that I still can't get my pickit2 to be seen by MPLABX.  It is
>> listed, along with Pickit3, in the Tool Selector list under Project
>> Properties.
>>
>> The Pickit 2 shows up with two yellow dots in front but the Pickit 3 shows 
>>up
>> with two red dots.
>>
>> According to the talk on Embedded Fun site, that means that Java don't have
>> all the 32bit libraries it needs to support the pk2.
>>
>> Anyway, I thought I would download the libraries with "sudo apt-get install
>> ia32-libs. That's the command they gave on the site anyway.
>>
>> Well of course, it didn't work.  The flag comes back, "file deleted or
>> missing."  Can you suggest any other place I can find these 32bit libraries?
>>
>> Bill
>>
> 
> Bill:
> 
> I haven't tried this myself, but I see a link to downloadable files for 
> Oneric Ocelot (e.g., Ubuntu 11.10) on 
> https://launchpad.net/ubuntu/+source/ia32-libs
> 
> Regards,
> Kent
> 
Hi Kent:
Thanks for the info.  Went to the site and downloaded some stuff, will see 
what I get.

Bill

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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread andy pugh
On 21 July 2012 18:45, Kent A. Reed  wrote:

> Errm. Dave said "Since doing this..." which suggests Axis used to start
> but doesn't start now that he has installed the Axiom card.

I was rather assuming that the Axiom card was a graphics card...

But if Axis doesn't start, but TKlinux does (assuming that _all_ that
was changed was the UI) then OpenGL is normally the problem.

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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Eric Keller
On Sat, Jul 21, 2012 at 3:31 PM, Kent A. Reed wrote:

>
> Agreed. It's also my first response to a problem. I haven't done my
> homework to figure out what messages to expect from a balky Axis setup.
> I figured the moment I said "check dmesg output" someone would ask what
> to look for, so I didn't say it.
>
I'm guessing it has something to do with the real-time system not starting,
but who knows?  In general, being able to diagnose using dmesg first
requires that one get used to seeing the output of dmesg.

Loved your anecdote, btw.  Still get that kind of nonsense from people that
should know better.  I was reading some online forum for controls techs
recently.  Not really germane to this discussion, but what I learned is
that the first rule of diagnosis is to leave your computer in the car or
it's your fault.

Eric
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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Kent A. Reed
On 7/21/2012 2:57 PM, Eric Keller wrote:
> On Sat, Jul 21, 2012 at 1:45 PM, Kent A. Reed wrote:
>
>> Rather, I'd have to ask what else was changed when the Axiom card was
>> installed?  Call me an ornery cuss, but I suspect changes were made to
>> configuration files that interfere with Axis starting.
>>
>> Logic dictates that if the computer is displaying stuff on the screen,
> he's not having graphics card issues because of the axiom card.
>
> Don't we have a troubleshooting procedure in the wiki?  I swear it's in
> there but I am also too lazy to look.

Even if we do, it's hard to design one that addresses every possible 
problem. I have been trying to get some reasonably important online 
financial work done today so I didn't look either (that's a pompous way 
of saying "I was too lazy to look" since I obviously keep my email 
client open).

> The dmesg command is where I always start, it's pretty useful to be able to
> read the messages there.

Agreed. It's also my first response to a problem. I haven't done my 
homework to figure out what messages to expect from a balky Axis setup. 
I figured the moment I said "check dmesg output" someone would ask what 
to look for, so I didn't say it.

> Eric

Regards,
Kent


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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Eric Keller
On Sat, Jul 21, 2012 at 1:45 PM, Kent A. Reed wrote:

>
> Rather, I'd have to ask what else was changed when the Axiom card was
> installed?  Call me an ornery cuss, but I suspect changes were made to
> configuration files that interfere with Axis starting.
>
> Logic dictates that if the computer is displaying stuff on the screen,
he's not having graphics card issues because of the axiom card.

Don't we have a troubleshooting procedure in the wiki?  I swear it's in
there but I am also too lazy to look.
The dmesg command is where I always start, it's pretty useful to be able to
read the messages there.
Eric
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Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread Kent A. Reed
On 7/21/2012 12:45 PM, andy pugh wrote:
> On 21 July 2012 17:38, Dave Keeton  wrote:
>> All,
>>I installed a Axiom ax5214h card in my control. Since doing this
>> the Axis GUI will not start up in my config. TKEMC runs fine. Any help
>> would be appreciated.
> Probably a graphics card or opengl issue, there are possible solutions
> to both issues here:
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?TroubleShooting#Display_Issues

Errm. Dave said "Since doing this..." which suggests Axis used to start 
but doesn't start now that he has installed the Axiom card.

To my way of thinking this is not a graphics card or opengl issue unless 
Axis has never started. He doesn't say what the underlying system 
configuration is ("be specific to be terrific" is going to be my mantra) 
so I won't speculate on obscure possibilities involving the graphics 
subsystem.

Rather, I'd have to ask what else was changed when the Axiom card was 
installed?  Call me an ornery cuss, but I suspect changes were made to 
configuration files that interfere with Axis starting.

Just my two cents worth.

Regards,
Kent


PS - This situation reminds me of my life as a graduate student with a 
boatload of experimental data to analyze. I spent long hours in the user 
room of the university computer facility. Almost every night someone 
doing a class exercise would declare "My program used to work and now it 
doesn't. There must be something wrong with the system." They would 
often zero in on me because I was camped out with a stack of IBM manuals 
and trays full of elaborately decorated card decks.

The typical exchange would go something like this:

me) "I don't know anything about your program, but what changed between 
last time and this time?"
him) "Nothing."
me) "Then why are you running the program again?"
him) "Because I had to analyze a different case."
me) "So all you did was swap data decks?"
him) "Well, sure, I made a little change to the program but that 
wouldn't make any difference."
me) <...long silent stare...>


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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 12:55:27 andy pugh did opine:

> On 21 July 2012 16:44, Gene Heskett  wrote:
> > And I just now did hit a page with some size specs.  Looks like T15 is
> > as big as I can shoot for.  The thru hole in the extension is a good
> > fit for a 3.5 mm allen wrench.
> 
> Broach it hex then, it can't be _that_ hard.
> Just don't do your real part first.

A given.  I'll cut off half an inch of this drill rod and try that 2nd.  
First will be a piece of hard plastic like micarta.

Cheers, Gene
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page:  is up!
Why doesn't DOS ever say "EXCELLENT command or filename!"
%  
DOS Tip of the Day:
Add BUGS=OFF to your CONFIG.SYS file.

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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 12:14:51 Erik Christiansen did opine:

> On 21.07.12 07:51, Gene Heskett wrote:
> > On Saturday 21 July 2012 06:55:06 Erik Christiansen did opine:
> > > and seems to be reasonably talkative, even when things are going
> > > well.
> > 
> > Not so much, but maybe a clue from "service nfs-kernel-server
> > restart":
> > 
> > Jul 21 06:53:30 coyote kernel: [69826.321565] nfsd: last server has
> > exited, flushing export cache
> 
> Since most of your mounts aren't working, let's check that this doesn't
> mean that all the nfs daemons have left the building. A quick
> 
> $ ps -ef | grep nfsd
> 
> shows bunches of them here, and I've always made sure there were at
> least 4 of them running on a server. You get nowhere if they're gone,
> and I have had it happen, both on HPUX and Solaris boxes, back when I
> thought I knew how this stuff works.
> 
Same here, at least 7 or 8 copies.  Owned by root..

> > Jul 21 06:53:31 coyote kernel: [69827.534764] svc: failed to register
> > lockdv1 RPC service (errno 97).
> > Jul 21 06:53:31 coyote kernel: [69827.535528] NFSD: Using
> > /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
> > Jul 21 06:53:31 coyote kernel: [69827.535545] NFSD: starting 90-second
> > grace period
> > 
> > What is this lockdv1 RPC service?
> 
> Yeah. It has a real guilty look, doesn't it? Just looking at it, I guess
> it's a version 1 lock daemon, which the log entry is telling us is a
> Remote Procedure Call service. (RPC is an ancient unix protocol for
> making procedure calls on other machines across the network.
> If you do a "man -a rpc", you'll see that you could use it to get at
> nfs and portmapper services from a C program.) Incidentally, nfs needs
> one of them too, IIRC:
> 
> $ ps -ef | egrep portmap
> daemon 701 1  0 16:22 ?00:00:00 portmap
Yup, got one as expected.
> 
> The registration failure doesn't have to mean much, though. I have the
> same here:
> 
> Jul 21 17:39:34 ratatosk kernel: [ 4638.217979] svc: failed
> to register lockdv1 RPC service (errno 97).
> 
> I'm happy with this:
> 
> $ ps -ef | egrep '(lockd|statd)'   # egrep, not just grep. ;-)
> root15 2  0 16:22 ?00:00:00 [kblockd/0]
> root  3073 1  0 17:39 ?00:00:00 rpc.statd -L
> root  3340 2  0 17:39 ?00:00:00 [lockd]

I get this:
gene@coyote:~$ ps -ef|egrep 'lockd|statd'
root30 2  0 Jul20 ?00:00:00 [kblockd/0]
root31 2  0 Jul20 ?00:00:00 [kblockd/1]
root32 2  0 Jul20 ?00:00:00 [kblockd/2]
root33 2  0 Jul20 ?00:00:00 [kblockd/3]
statd 1323 1  0 Jul20 ?00:00:00 rpc.statd -L
gene  4657  2848  0 12:17 pts/600:00:00 egrep lockd|statd
root 25280 2  0 07:44 ?00:00:00 [lockd]

So its there.
> 
> NFS does need lockd and statd, to work properly, AFAIR, but it doesn't
> have to be lockdv1, I figure.
> 
> ...
> 
> > > How does your DNS respond to that hostname, if you try a
> > > "dig coyote.coyote.den", or if not, does at least
> > > "ping coyote.coyote.den " pick up the right IP address?
> > 
> > And this is nuking futz:
> ... Crook DNS results cropped to shorten things.
> 
> > Totally AFU!
> 
> OK, we don't want to rely on DNS to resolve those hostnames. ;-)
> 
> ... Good ping results wuz here.
> 
> > My hosts file:
> > 127.0.0.1   localhost
> > 192.168.71.3coyote.coyote.den   coyote
> > 192.168.71.1router.coyote.den   router
> > 192.168.71.4shop.coyote.den shop
> > 192.168.71.5lathe.coyote.denlathe
> > 192.168.71.6lappy.coyote.denlappy
> > 
> > # The following lines are desirable for IPv6 capable hosts
> > 
> > ::1 localhost ip6-localhost ip6-loopback
> > 
> > fe00::0 ip6-localnet
> > ff00::0 ip6-mcastprefix
> > ff02::1 ip6-allnodes
> > ff02::2 ip6-allrouters
> > ff02::3 ip6-allhosts
> > 
> > And resolv.conf:
> > nameserver 192.168.71.1
> > domain coyote.coyote.den
> > search  hosts,dns
> > 
> > Where the router is the gateway, which fwds the dns requests to one of
> > the shentel servers,  209.55.24.10  or 209.55.27.13
> 
> That's similar to what I have here, and a ping checks /etc/hosts, but
> dig doesn't, although I have:
> 
> $ more /etc/host.conf
> # The "order" line is only used by old versions of the C library.
> order hosts,bind
> multi on
> 
> And there's a likely explanation for why dns doesn't check /ets/hosts
> here either, because that "C library" is the resolver library.
> 
> ... More good ping results elided.
> 
> > I do not have a local to this machine dns server (adns, dnsmasq, etc)
> > installed, and just installed dnswalk to see what it says:
> > root@coyote:/var# dnswalk -adilrfFm coyote.coyote.den.
> > Checking coyote.coyote.den.
> > BAD: SOA record not found for coyote.coyote.den.
> > !BAD: coyote.coyote.den. has NO authoritative nameservers!
> > !BAD: All zone transfer attempts of coyote.coyote.den. faile

Re: [Emc-users] Axis Gui will not run

2012-07-21 Thread andy pugh
On 21 July 2012 17:38, Dave Keeton  wrote:
> All,
>   I installed a Axiom ax5214h card in my control. Since doing this
> the Axis GUI will not start up in my config. TKEMC runs fine. Any help
> would be appreciated.

Probably a graphics card or opengl issue, there are possible solutions
to both issues here:
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?TroubleShooting#Display_Issues

-- 
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http://www.ifixit.com/Manifesto

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[Emc-users] Axis Gui will not run

2012-07-21 Thread Dave Keeton
All,
  I installed a Axiom ax5214h card in my control. Since doing this
the Axis GUI will not start up in my config. TKEMC runs fine. Any help
would be appreciated.

Dave



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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread andy pugh
On 21 July 2012 16:44, Gene Heskett  wrote:

> And I just now did hit a page with some size specs.  Looks like T15 is as
> big as I can shoot for.  The thru hole in the extension is a good fit for a
> 3.5 mm allen wrench.

Broach it hex then, it can't be _that_ hard.
Just don't do your real part first.

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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 11:53:33 Kent A. Reed did opine:

> Gene:
> 
> I'm not going to comment your recent emails because 1) I don't want to
> take the time to understand the information scattered through them and
> 2) the result would be unreadable:-)
> 
> Assuming all hosts have the appropriate packages installed, some
> thoughts are:
> 
> 1) maybe this is all working anyhow. Do you understand the autofs "way"
> is not actually to mount a remote directory until such time as a user
> tries to use it and that remote directories are unmounted after a period
> of unuse? Simply ls'ing the mount point isn't sufficient. It would show
> nil just as you report.
> 
I am aware of that.  Now here it gets odd.  I can cd to /net/lathe, or 
/net/shop (I should change its name to mill, but it was first)
and then see the home dir exported.  And I haven't changed anything since 
the last time mc would not do the cd.  And just now, mc can cd to 
/net/shop/home or /net/lathe/home, but is getting no perms errors from any 
attempt to cd into the home/gene tree.  Humm, a what the F moment, it says 
here that root:root owns /net/lathe/home/gene!  But if I ssh -Y into lathe, 
an ls -l says /home/gene is indeed owned by gene:gene.

Do I have an export rule boogered?

> 2) don't go any farther until you can reliably ssh between any two hosts
> on your network using their symbolic host names. If there are three
> hosts, you have 6 tests (ssh from a to b and c, from b to c and a, and
> from c to a). If ssh doesn't succeed, neither will the nfs executables.

ssh -Y logins will let me use vim, and I can run linuxcnc over the link, 
but gedit 'can't open display'.  As I'm using the neauvou display driver 
here, I think that could be related, the last time I was running the nvidia 
drivers it worked.
> 
> 3) start simple and add complexity. Forget about autofs for a moment. On
> each host, you should be able to start an nfs server exporting a single
> directory and then mount that directory manually on each client of that
> server. It took me just a few minutes to get this far with three new
> virtual Ubuntu hosts---one installed from the LinuxCNC LiveCD---running
> on my main machine. Again, there would be 6 tests if you want to be
> exhaustive about it. By the way, assuming your exports file permits it,
> you can mount on a particular host a directory exported by that same
> host. This enables doing some elementary tests without running from
> console to console.
> 
> 4) now introduce autofs, one host at a time, and test that you can
> access directories exported from elsewhere, keeping 1) in mind. I have
> other things to do, but I'll try to get to this tonight with my virtual
> testbed.
> 
> 5) the /var/log directory is loaded with log files. In addition to
> the/var/log/kern.log file already mentioned, you can look at
> /var/log/syslog.
> 
> 6) nfs is a heterogeneous constellation of executables and configuration
> files which grew like kudzu over the years as different vendors got on
> the Sun Microsystems bandwagon. The Linux versions of these came from
> various sources as well. Most of the executables allow a debug option
> (-d) of some sort, but you have to be creative to figure out how to
> invoke it since some of the executables run as daemons. Remember that
> any executable intended to be a daemon can be run stand-alone for
> testing purposes.
> 
> I do not claim to be an nfs guru. Indeed, I'm not even a big fan of nfs.
> Despite its irritations, however, it can serve (pun intended) us well.
> I've been gone for a while but I assume NIST still has a patchwork quilt
> of hundreds of hosts from many vendors running as clients and servers
> across the 600-acre Gaithersburg campus and between Gaithersburg MD and
> Boulder Colorado. Some folks ran tightly coupled to it, max'ing their
> use of its capabilities to manage every aspect including the boot
> process, the hosts and passwd files, yada yada yada; some, like me, used
> it only to access shared application programs and their license-key
> pools. Of course we had a number of NFS administrators who had to be put
> in their place from time to time when they started thinking they talked
> directly to God.

Chuckle, I've dealt with the type.  Peter Principle at work. :)
 
> Just my 2 cents worth.

Potentially worth more, thanks Kent.
> 
> Regards,
> Kent
> 
> 
> 
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Cheers, Gene
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Greg Bernard
This web page has a chart for calculating the "critical speed" for ball screws: 
http://www.roton.com/application_engineering.aspx
 
+++
We are like tenant farmers chopping down the fence around our house for 
fuel when we should be using Nature's inexhaustible sources of energy -- sun, 
wind and tide. ... I'd put my money on the sun and solar energy. 
What a source of power! I hope we don't have to wait until oil and coal 
run out before we tackle that. -Thomas Edison, inventor (1847-1931) 



>
> From: Jeshua Lacock 
>To: Enhanced Machine Controller (EMC)  
>Sent: Friday, July 20, 2012 5:18 PM
>Subject: [Emc-users] [Off] Ballscrew Support?
> 
>
>Greetings,
>
>I am upgrading my machine to handle a full 4x8 foot board of material (and 5 
>feet of Z!). The new table is 5x9 feet.
>
>I just received my 3-meter 25mm supported rails and 25mm C7 ballscrews.
>
>I am sure with a 10-foot span that the horizontal ballscrews will sag a little 
>from gravity. Is this much of a concern? Does anyone know of a trick to put 
>some kind of support in the middle of the span? I can't think of any practical 
>way.
>
>Thanks!
>
>
>Best,
>
>Jeshua Lacock
>Founder/Engineer
>3DTOPO Incorporated
>
>Phone: 208.462.4171
>
>
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>
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jon Elson
Jeshua Lacock wrote:
> On Jul 20, 2012, at 9:13 PM, Stuart Stevenson wrote:
>
>   
>> Andy's solution is the correct solution. A string will fold under
>> compression. This will allow the supports to collapse together when the nut
>> moves their direction on the screw. The string will pull the supports along
>> with the nut and allow the supports to space themselves along the screw
>> with the spacing equivalent to the length of the string sections.
>>
>> The 5 axis Cincinnati machines in my shop have .007 to .009 in
>> preload/stretch.
>> 
>
> Hi Stuart,
>
> Thanks for the clarification!
>
> I am not sure what yo mean by preload/stretch though.
>   
Bearings at each end of the leadscrew STRETCH it across the frame of the
machine, literally making the screw a few thousandths of an inch longer.
This raises the natural vibration frequency moving the critical speed up,
as well as prevents the screw from buckling under compressive loads.
As long as the forces applied at the ballnut are less than the tension, then
the screw remains under some tension.

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jon Elson
Jeshua Lacock wrote:
>
> It looks like over a 10 foot span I have about 24mm (0.96 inches) of sag in 
> the middle. 
>   
10 foot span?  25 mm diameter?  Oh, my, that sounds WAY past the safe range.
See http://www.nookindustries.com/ball/BallCalculators.cfm#CriticalSpeed
for a critical speed calculator.  With the stiffest fixing of the ends, 
you might
be able to get 500 RPM safely.  That would be 100 IPM with a 5 TPI screw.
With a coarser leadscrew pitch, you don't ned as high an RPM, so maybe
this will be OK.

Jon

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 11:45:42 andy pugh did opine:

> On 21 July 2012 05:09, Jeshua Lacock  wrote:
> > 550 RPMs does not exactly strike me as spinning at high speed.
> > Besides, wouldn't the gyroscopic force help stabilized oscillations?
> 
> No, centrifugal force acts as a positive feedback on any off-centre
> movement.
> 
> As Steve has said, there are specs for this in the ballscrew
> catalogues, and he seems to be suggesting that 25mm is fine for 10'
> according to them.
> 
> As a warning, whipping can be a deadly problem with long bars out the
> back of a lathe headstock. They need to be restrained quite strongly.

Yeah, I've had to make s miniature gun barrel spider for my mini-lathe and 
dial that in pretty closely if I want to turn more than 3 or 4 hundred 
revs.  I once had a 3 foot piece of hot roll making a 4" circle on the far 
end, scary.  It was only off maybe 1/16" turning the chuck by hand!

Cheers, Gene
-- 
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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 11:37:54 andy pugh did opine:

> On 21 July 2012 05:21, Gene Heskett  wrote:
> > It looks like I am stuck with the 3.5mm allen socket to drive this.
> 
> I can't help feeling that a Torx head would be easier to make,as it is
> just about mill-able.
> It might take some experimenting and tweaking (maybe in a block of
> plastic) to get the shape right, though.
> 
> > 2.  I have a live center for this mini-lathe, and if I really really
> > snug down the tailstock clamp, it might make 200 + lbs of push. 
> > Likely not enough to push it straight in.
> 
> You could perhaps augment the tailstock clamp with things clamped to
> the bed behind it.
> If it fails, you could probably finish it off with a hammer….

And I just now did hit a page with some size specs.  Looks like T15 is as 
big as I can shoot for.  The thru hole in the extension is a good fit for a 
3.5 mm allen wrench.  Drilling it out to 3.8 for a T-20 would be pushing my 
luck. T-15 is .128" across the peaks.  This is gonna be fun I suspect, 
depending on ones definition of "fun"...


Cheers, Gene
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 soap, ballot, jury, and ammo. Please use in that order."
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Is this the line for the latest whimsical YUGOSLAVIAN drama which also
makes you want to CRY and reconsider the VIETNAM WAR?

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Jon Elson
Jeshua Lacock wrote:
> On Jul 20, 2012, at 6:00 PM, Stephen Dubovsky wrote:
>
>   
>> Sag is only the start of the problem.  The whip is going to be the real
>> problem.  
>> 
>
> Hi Stephen,
>
> I am not sure I understand what you mean by "whip"?
>
>   
Long, thin shafts tend to "whip" when spun at high speeds.  Look up "first
critical speed".  When the rotation speed matches the first vibrational
moment's natural frequency, the vibration can build to enormous magnitude
very quickly, permanently bending the shaft.  Above the first critical 
speed,
the shaft will rotate about its center of mass.  Below that speed, it will
rotate around the axis of its support bearings.  Most ballscrew 
manufacturers
have charts of critical speed, and you'd be amazed at how low these
are for the longer ones, even at 25mm diameter.  Also remember that a 
ballscrew
is a lot less stiff than a solid shaft, and so the natural frequency is 
a lot
lower.

Jon

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Re: [Emc-users] Broaching this screw.

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 10:51:04 andy pugh did opine:

> On 21 July 2012 05:21, Gene Heskett  wrote:
> > It looks like I am stuck with the 3.5mm allen socket to drive this.
> 
> I can't help feeling that a Torx head would be easier to make,as it is
> just about mill-able.

With sub .03125" mills. Some slop in the grooves is probably un-avoidable 
with any mill that can reach 4mm depth in a straight plunge cut.  Probably 
made dangerous for that small a mill as the post sled way on my mill has 
developed a stiction problem and descends in .002" increments of late when 
moving at creep speeds.  No amount of gib adjusting seems to effect it, but 
drowning in it vactra fixes it for 5 minutes maybe.  There are a lot of 
hours on this mill, one gear has wobbled out the keyway in its hub already, 
and its getting very noisy again.  The bearings seem to be holding up, 
better than I expected since you have to beat on the end of the draw bolt 
to change tooling with a couple lbs of steel, but those plastic gears have 
got to go.  I'm going deaf listening to them.

Thinking on milling it, I think it would be better to drill the hole 
pattern, and use that same teeny drill to put a pilot hole in the center, 
then drill out the center with very sharp bits.  I'll play with some 
plastic today just for S&G's.

> It might take some experimenting and tweaking (maybe in a block of
> plastic) to get the shape right, though.

Humm, some of that micarta I made the pcb palate from might do.  HDPE has 
buckets of spring back as I found when I went to make some faces for the 
fence on my router table.  This micarta throws up a ridge around a tapped 
hole, but at least it stays thrown up, the screw does fit the hole.  So I 
drill & tap, then mill the pocket, which mills away the ridge where it 
counts.
 
That was also my original thought Andy, until I went looking for specs on 
the torx form that I could write gcode from.  Either my google fu is bad, 
or its proprietary & unpublished.  Its not mentioned at all in my 
Machinery's Handbook either, issue #27.  Unk if its included in newer 
versions.

If you have a URL to a spec for the torx stuff, I'd sure appreciate it.

> > 2.  I have a live center for this mini-lathe, and if I really really
> > snug down the tailstock clamp, it might make 200 + lbs of push. 
> > Likely not enough to push it straight in.
> 
> You could perhaps augment the tailstock clamp with things clamped to
> the bed behind it.

That would be tried if I can't hold it with the bolt/square plate washer it 
uses now.  TBT, that square plate needs to be, and there is room for it, 
twice as thick.

> If it fails, you could probably finish it off with a hammer….

Either way, I'll have to chuck up a block of something and drill & tap a 
7mmx1.00 hole to hold it against the beating.  If I give it a good coat of 
moly sulfide grease, I should be able to unscrew it from the scrap even it 
this drill rod expends a hair in the process.

But first we play with some plastic.

Cheers, Gene
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Viesturs Lācis
2012/7/21 Erik Christiansen :
>
> Of the other machines that you've built, do any have a horizontal
> ballscrew as long and slender as this one, spun at similar speeds?

That was the first time I used ballscrews, so I have no other
experiece to compare with.
For the next machines I am designing ballscrews only for Z axes, where
the travel is relatively short. For X and Y, where travel is larger
(for one of them it is up to 6 m) I will stick with rack and pinion.

> Are you game to mention how badly eccentric the nut housing was
> machined, in order to create the problem? Is there room to machine a
> little off the outside of the bearing mount, and slip on an eccentric
> outer, locktited in place with the equal eccentricities opposed, to
> cancel them? (Or some other rectification.)

I have no idea, how to measure it precisely.
Anyway, I think that manufacturing new, more precise housings is the
only way to go.

> Admittedly, an 80% reduction
> in maximum rapid speed doesn't mean an 80% reduction in production rate,
> but it still seems a big loss.

Yes of course, feedrates for milling certainly would not reach even
close to max speeds. It is big loss in all the rapids.

> If the eccentricity is very small, is there possibly a resonance in the
> frame exacerbating the vibration? A significant mass tightly clamped in
> several different places might help check for that?

It is not eccentric. The thing is that center line of the ballscrew
nut does not match the line it actually rotates around - there is some
angle between them. So it pushes the ballscrew in one side of the nut
in one direction and on the other side - in opposite direction.

-- 
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If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Erik Christiansen
On 21.07.12 07:51, Gene Heskett wrote:
> On Saturday 21 July 2012 06:55:06 Erik Christiansen did opine:
> > and seems to be reasonably talkative, even when things are going
> > well.

> Not so much, but maybe a clue from "service nfs-kernel-server restart":
> 
> Jul 21 06:53:30 coyote kernel: [69826.321565] nfsd: last server has exited, 
> flushing export cache

Since most of your mounts aren't working, let's check that this doesn't
mean that all the nfs daemons have left the building. A quick

$ ps -ef | grep nfsd

shows bunches of them here, and I've always made sure there were at
least 4 of them running on a server. You get nowhere if they're gone,
and I have had it happen, both on HPUX and Solaris boxes, back when I
thought I knew how this stuff works.

> Jul 21 06:53:31 coyote kernel: [69827.534764] svc: failed to register 
> lockdv1 RPC service (errno 97).
> Jul 21 06:53:31 coyote kernel: [69827.535528] NFSD: Using 
> /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
> Jul 21 06:53:31 coyote kernel: [69827.535545] NFSD: starting 90-second 
> grace period
> 
> What is this lockdv1 RPC service?

Yeah. It has a real guilty look, doesn't it? Just looking at it, I guess
it's a version 1 lock daemon, which the log entry is telling us is a Remote
Procedure Call service. (RPC is an ancient unix protocol for making
procedure calls on other machines across the network.
If you do a "man -a rpc", you'll see that you could use it to get at
nfs and portmapper services from a C program.) Incidentally, nfs needs
one of them too, IIRC:

$ ps -ef | egrep portmap
daemon 701 1  0 16:22 ?00:00:00 portmap

The registration failure doesn't have to mean much, though. I have the
same here:

Jul 21 17:39:34 ratatosk kernel: [ 4638.217979] svc: failed
to register lockdv1 RPC service (errno 97).

I'm happy with this:

$ ps -ef | egrep '(lockd|statd)'   # egrep, not just grep. ;-)
root15 2  0 16:22 ?00:00:00 [kblockd/0]
root  3073 1  0 17:39 ?00:00:00 rpc.statd -L
root  3340 2  0 17:39 ?00:00:00 [lockd]

NFS does need lockd and statd, to work properly, AFAIR, but it doesn't
have to be lockdv1, I figure.

...

> > How does your DNS respond to that hostname, if you try a
> > "dig coyote.coyote.den", or if not, does at least
> > "ping coyote.coyote.den " pick up the right IP address?
> 
> And this is nuking futz:

... Crook DNS results cropped to shorten things.

> Totally AFU!

OK, we don't want to rely on DNS to resolve those hostnames. ;-)

... Good ping results wuz here.

> My hosts file:
> 127.0.0.1 localhost
> 192.168.71.3  coyote.coyote.den   coyote
> 192.168.71.1  router.coyote.den   router
> 192.168.71.4  shop.coyote.den shop
> 192.168.71.5  lathe.coyote.denlathe
> 192.168.71.6  lappy.coyote.denlappy
> 
> # The following lines are desirable for IPv6 capable hosts
> ::1 localhost ip6-localhost ip6-loopback
> fe00::0 ip6-localnet
> ff00::0 ip6-mcastprefix
> ff02::1 ip6-allnodes
> ff02::2 ip6-allrouters
> ff02::3 ip6-allhosts
> 
> And resolv.conf:
> nameserver 192.168.71.1
> domain coyote.coyote.den
> searchhosts,dns
> 
> Where the router is the gateway, which fwds the dns requests to one of the 
> shentel servers,  209.55.24.10  or 209.55.27.13

That's similar to what I have here, and a ping checks /etc/hosts, but
dig doesn't, although I have:

$ more /etc/host.conf 
# The "order" line is only used by old versions of the C library.
order hosts,bind
multi on

And there's a likely explanation for why dns doesn't check /ets/hosts
here either, because that "C library" is the resolver library.

... More good ping results elided.

> I do not have a local to this machine dns server (adns, dnsmasq, etc) 
> installed, and just installed dnswalk to see what it says:
> root@coyote:/var# dnswalk -adilrfFm coyote.coyote.den.
> Checking coyote.coyote.den.
> BAD: SOA record not found for coyote.coyote.den.
> !BAD: coyote.coyote.den. has NO authoritative nameservers!
> !BAD: All zone transfer attempts of coyote.coyote.den. failed!
> !0 failures, 0 warnings, 3 errors.

To make sure we only have to debug nfs, what about trying in
/etc/exports:

/my/shared/filesystem  192.168.71.0/24(rw)

(I've forgotten the names of what you're exporting)
Now we don't have to resolve any hostnames, which eliminates another
potential cause of the observed failure. The other mount attributes
won't hurt, but they're both defaults now, IIUC.

> And of coarse there is no /var/named directory.  I figured the hosts files 
> should handle the local stuff & if its not in the hosts file, send it to 
> the gateway, my router, which is a Buffalo Hi-Power running genuine dd-wrt.
> 
> So despite the dig results, I should be covered.  Humm, "hostname" returns 
> the alias!
> root@coyote:/var# hostname
> coyote

"Should be", but what happens with "192.168.71.0/24(rw)" in
/etc/exports, I wonder?

> Should it not be returning the FQDN?

Try: $ hos

Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Kent A. Reed
On 7/21/2012 8:42 AM, andy pugh wrote:
> On 21 July 2012 05:09, Jeshua Lacock  wrote:
>
>> 550 RPMs does not exactly strike me as spinning at high speed. Besides, 
>> wouldn't the gyroscopic force help stabilized oscillations?
> No, centrifugal force acts as a positive feedback on any off-centre movement.
>
> As Steve has said, there are specs for this in the ballscrew
> catalogues, and he seems to be suggesting that 25mm is fine for 10'
> according to them.
>
> As a warning, whipping can be a deadly problem with long bars out the
> back of a lathe headstock. They need to be restrained quite strongly.
>

For example, see the "Types of end fixity" and "Critical speed" entries 
in http://www.roton.com/application_engineering.aspx

 From Figure 28, I infer that the critical speed for a 25mm (1in) drive 
screw 10ft long and supported at both ends is about 1000rpm. From Table 
40 I infer that this speed drops to about 320rpm if one end is free and 
rises to about 1550rpm if one end is fixed and the other supported. See 
Table 40 for a definition of free, supported, and fixed.

I once saw a student start up a lathe with about 3 feet of slender rod 
extending out the back of the headstock. In less time than it took the 
hapless student to hit the kill switch, that free end was tracing out a 
cone shaped path at speed. Hate to think what would have happened to 
anybody unfortunate enough to be within its range. The shop supervisor 
went white as a sheet. Given enough students (and I was one too!) 
everything that can happen, will happen.

Regards,
Kent


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Florian Rist
Hi Jeshua

 > I am sure with a 10-foot span that the horizontal ballscrews
 > will sag a little from gravity. Is this much of a concern?

I think for long screws it generally a good idea not to drive the 
ball-screws, but the nut. While this will not reduce the sag you 
mentioned, it will greatly improve stability and reduce vibrations.

There are special servo with hollow axis that you can directly attach to 
the carriage frame and the ball nut, the result is nice in-line direct 
ball-nut drive. But using a belt drive an a standard motor you could 
most probably build nice drive, too. No as rigid and dynamic and 
precise, but still much better than to drive a long screw.

cu
Flo

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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Kent A. Reed
Gene:

I'm not going to comment your recent emails because 1) I don't want to 
take the time to understand the information scattered through them and 
2) the result would be unreadable:-)

Assuming all hosts have the appropriate packages installed, some 
thoughts are:

1) maybe this is all working anyhow. Do you understand the autofs "way" 
is not actually to mount a remote directory until such time as a user 
tries to use it and that remote directories are unmounted after a period 
of unuse? Simply ls'ing the mount point isn't sufficient. It would show 
nil just as you report.

2) don't go any farther until you can reliably ssh between any two hosts 
on your network using their symbolic host names. If there are three 
hosts, you have 6 tests (ssh from a to b and c, from b to c and a, and 
from c to a). If ssh doesn't succeed, neither will the nfs executables.

3) start simple and add complexity. Forget about autofs for a moment. On 
each host, you should be able to start an nfs server exporting a single 
directory and then mount that directory manually on each client of that 
server. It took me just a few minutes to get this far with three new 
virtual Ubuntu hosts---one installed from the LinuxCNC LiveCD---running 
on my main machine. Again, there would be 6 tests if you want to be 
exhaustive about it. By the way, assuming your exports file permits it, 
you can mount on a particular host a directory exported by that same 
host. This enables doing some elementary tests without running from 
console to console.

4) now introduce autofs, one host at a time, and test that you can 
access directories exported from elsewhere, keeping 1) in mind. I have 
other things to do, but I'll try to get to this tonight with my virtual 
testbed.

5) the /var/log directory is loaded with log files. In addition to 
the/var/log/kern.log file already mentioned, you can look at 
/var/log/syslog.

6) nfs is a heterogeneous constellation of executables and configuration 
files which grew like kudzu over the years as different vendors got on 
the Sun Microsystems bandwagon. The Linux versions of these came from 
various sources as well. Most of the executables allow a debug option 
(-d) of some sort, but you have to be creative to figure out how to 
invoke it since some of the executables run as daemons. Remember that 
any executable intended to be a daemon can be run stand-alone for 
testing purposes.

I do not claim to be an nfs guru. Indeed, I'm not even a big fan of nfs. 
Despite its irritations, however, it can serve (pun intended) us well. 
I've been gone for a while but I assume NIST still has a patchwork quilt 
of hundreds of hosts from many vendors running as clients and servers 
across the 600-acre Gaithersburg campus and between Gaithersburg MD and 
Boulder Colorado. Some folks ran tightly coupled to it, max'ing their 
use of its capabilities to manage every aspect including the boot 
process, the hosts and passwd files, yada yada yada; some, like me, used 
it only to access shared application programs and their license-key 
pools. Of course we had a number of NFS administrators who had to be put 
in their place from time to time when they started thinking they talked 
directly to God.

Just my 2 cents worth.

Regards,
Kent


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Stuart Stevenson
> I am not sure what yo mean by preload/stretch though.
>
>
> After installing the ballscrew you then put an indicator on the end of the
ball screw with the mag base on the machine base. You then tighten the
bearing preload until you see .007 to .009 stretch of the end of the
ballscrew. I don't know which is really moving - the screw stretching for
the machine base compressing. I am sure both is happening but to what
extent I don't know.


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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread BRIAN GLACKIN
For long machines where the cutting forces are not hugely significant (such
as a wood router) could one not used a aircraft cable setup? The cable
could then be run over a motorized pulley.

Something I always thought of but haven't fleshed it out further.

Brian
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Erik Christiansen
On 21.07.12 14:41, Viesturs Lācis wrote:
> 2012/7/21 Erik Christiansen :
> >
> > In any event, I'd fix a long slender ballscrew, to avoid whipping, and
> > rotate the nut.
> 
> I did this on the last machine I built with this exact intention in my mind.
> The overall result - failure. I seriously doubt I will ever do that again.
> Longest screw was 2800 mm long (other 2 were 1800 mm long), all of
> them - 16 mm diameter, 10 mm pitch.
> 
> My main conclusion - the nut housing requires pretty precise machining
> to match the central axis of the nut itself with the axis around which
> that nut rotates in bearings.
> I had some deviations there, so the rotation of the nut caused the
> screw to vibrate, so the max speed ended up to be 5x smaller than
> initially planned just to avoid excessive vibrations.

Viesturs,

Of the other machines that you've built, do any have a horizontal
ballscrew as long and slender as this one, spun at similar speeds? There
is nothing quite like a direct physical comparison, to sort out which is
better. It is a pity that you are do far away. It would be very
interesting to see the effect first hand, just to learn.

Are you game to mention how badly eccentric the nut housing was
machined, in order to create the problem? Is there room to machine a
little off the outside of the bearing mount, and slip on an eccentric
outer, locktited in place with the equal eccentricities opposed, to
cancel them? (Or some other rectification.) Admittedly, an 80% reduction
in maximum rapid speed doesn't mean an 80% reduction in production rate,
but it still seems a big loss.

If the eccentricity is very small, is there possibly a resonance in the
frame exacerbating the vibration? A significant mass tightly clamped in
several different places might help check for that?

Erik

-- 
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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread andy pugh
On 21 July 2012 05:09, Jeshua Lacock  wrote:

> 550 RPMs does not exactly strike me as spinning at high speed. Besides, 
> wouldn't the gyroscopic force help stabilized oscillations?

No, centrifugal force acts as a positive feedback on any off-centre movement.

As Steve has said, there are specs for this in the ballscrew
catalogues, and he seems to be suggesting that 25mm is fine for 10'
according to them.

As a warning, whipping can be a deadly problem with long bars out the
back of a lathe headstock. They need to be restrained quite strongly.

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Re: [Emc-users] C Compiler - MPLAB

2012-07-21 Thread Erik Friesen
I don't know, I am not familiar with HID in linux.  I would suggest
posting, or searching the MplabX
forumsfor this info, if you
can't get anywhere

On Fri, Jul 20, 2012 at 11:07 PM, Kent A. Reed wrote:

> On 7/20/2012 10:10 PM, Cathrine Hribar wrote:
> >
> > On Mon, 16 Apr 2012 14:47:49 -0400
> >Erik Friesen  wrote:
> >> On Mon, Apr 16, 2012 at 2:33 PM, Dave  wrote:
> >>
> >>> On 4/16/2012 1:15 PM, Erik Friesen wrote:
> >>>
> http://embeddedfun.blogspot.com/2011/05/installing-mplabx-on-ubuntu-1104.html
>  ...
> 
> > Hi Erik:
> >
> > Well I have MPLAB-X running on Ubuntu 11.10, thanks to you.
> >
> > My problem is that I still can't get my pickit2 to be seen by MPLABX.
>  It is
> > listed, along with Pickit3, in the Tool Selector list under Project
> > Properties.
> >
> > The Pickit 2 shows up with two yellow dots in front but the Pickit 3
> shows up
> > with two red dots.
> >
> > According to the talk on Embedded Fun site, that means that Java don't
> have
> > all the 32bit libraries it needs to support the pk2.
> >
> > Anyway, I thought I would download the libraries with "sudo apt-get
> install
> > ia32-libs. That's the command they gave on the site anyway.
> >
> > Well of course, it didn't work.  The flag comes back, "file deleted or
> > missing."  Can you suggest any other place I can find these 32bit
> libraries?
> >
> > Bill
> >
>
> Bill:
>
> I haven't tried this myself, but I see a link to downloadable files for
> Oneric Ocelot (e.g., Ubuntu 11.10) on
> https://launchpad.net/ubuntu/+source/ia32-libs
>
> Regards,
> Kent
>
>
>
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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Gene Heskett
On Saturday 21 July 2012 06:55:06 Erik Christiansen did opine:

> On 20.07.12 10:51, Gene Heskett wrote:
> > On Friday 20 July 2012 10:18:49 Erik Christiansen did opine:
> > > Would it help if we again posted some advice on how to most easily
> > > change the uids on one host to match another?
> > 
> > While that could I suppose be useful when the distro's involved are
> > mix-n- match, I fail to see the utility of it when I am uid:gid 1000
> > on all 4 machines, all installed from our own 10.04-4 LTS install cd.
> 
> That's fair, since you've already done all we were suggesting. So that
> source of trouble has been eliminated.
> 
> > Much more useful would be some real examples that all I'd need to
> > translate would be to my hostnames or even hardcoded addresses.  To
> > my knowledge, there does not seem to be a way to make these services
> > startup like a babbling idiot and tell us what they are doing, or why
> > they can't do it. That would be 1000's of times more useful.
> 
> True. When it's failing, what do the logfiles say? ISTR that it's one of
> the first places you usually look, admittedly. The nfs-kernel-server
> package unsurprisingly logs stuff in /var/log/kern.log,

I didn't know that, thank you.

> and seems to be
> reasonably talkative, even when things are going well.
> 
Not so much, but maybe a clue from "service nfs-kernel-server restart":

Jul 21 06:53:30 coyote kernel: [69826.321565] nfsd: last server has exited, 
flushing export cache
Jul 21 06:53:31 coyote kernel: [69827.534764] svc: failed to register 
lockdv1 RPC service (errno 97).
Jul 21 06:53:31 coyote kernel: [69827.535528] NFSD: Using 
/var/lib/nfs/v4recovery as the NFSv4 state recovery directory
Jul 21 06:53:31 coyote kernel: [69827.535545] NFSD: starting 90-second 
grace period

What is this lockdv1 RPC service?

> Without a hint from the logs, we're reduced to shooting in the dark, or
> at least through a growing cloud of BP smoke of our own making.
> 
> > ATM, my /etc/exports file contains 1 non-commented line:
> > /home/gene/ coyote.coyote.den(rw,sync,no_subtree_check)
> 
> How does your DNS respond to that hostname, if you try a
> "dig coyote.coyote.den", or if not, does at least
> "ping coyote.coyote.den " pick up the right IP address?

And this is nuking futz:

root@coyote:/etc/init.d# dig coyote.coyote.den

; <<>> DiG 9.7.0-P1 <<>> coyote.coyote.den
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58240
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;coyote.coyote.den. IN  A

;; ANSWER SECTION:
coyote.coyote.den.  60  IN  A   8.15.7.122
coyote.coyote.den.  60  IN  A   63.251.179.29

;; AUTHORITY SECTION:
coyote.coyote.den.  65535   IN  NS  WSC2.JOMAX.NET.
coyote.coyote.den.  65535   IN  NS  WSC1.JOMAX.NET.

;; Query time: 113 msec
;; SERVER: 192.168.71.1#53(192.168.71.1)
;; WHEN: Sat Jul 21 07:00:29 2012
;; MSG SIZE  rcvd: 123

Totally AFU!

root@coyote:/etc/init.d# ping -c3 coyote.coyote.den
PING coyote.coyote.den (192.168.71.3) 56(84) bytes of data.
64 bytes from coyote.coyote.den (192.168.71.3): icmp_seq=1 ttl=64 
time=0.022 ms
64 bytes from coyote.coyote.den (192.168.71.3): icmp_seq=2 ttl=64 
time=0.016 ms
64 bytes from coyote.coyote.den (192.168.71.3): icmp_seq=3 ttl=64 
time=0.025 ms
In fact my local address is 192.168.71.3, and the router says my wan 
address is 204.111.65.217 and since I'm on a cable modem, that hasn't 
changed in 2+ years.

My hosts file:
127.0.0.1   localhost
192.168.71.3coyote.coyote.den   coyote
192.168.71.1router.coyote.den   router
192.168.71.4shop.coyote.den shop
192.168.71.5lathe.coyote.denlathe
192.168.71.6lappy.coyote.denlappy

# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

And resolv.conf:
nameserver 192.168.71.1
domain coyote.coyote.den
search  hosts,dns

Where the router is the gateway, which fwds the dns requests to one of the 
shentel servers,  209.55.24.10  or 209.55.27.13

> (i.e. are we certain that the problem is in NFS?)
> Just for comparison, I've gotten away with nothing more than lines like
> this in /etc/exports:   /export/share 192.168.1.0/24(rw)
> 
> > On all machines with the FQDN of that machine edited in.
> > 
> > Similarly, the only active line in /etc/auto.master on all machines
> > is: /net-hosts
> 
> I've never tried autofs. In this case, it seems to be another potential
> source of gremlins. Your aversion to editing /etc/fstab is noted, but if
> we append a line to nfs mount a remote filesystem, it
> (a) shouldn't interfere with preceding mounts, IIRC, and
> (b) can be tested before shutting down, by invoking the mount command
> just with either the filesystem or mountpoint a

Re: [Emc-users] Broaching this screw.

2012-07-21 Thread andy pugh
On 21 July 2012 05:21, Gene Heskett  wrote:

> It looks like I am stuck with the 3.5mm allen socket to drive this.

I can't help feeling that a Torx head would be easier to make,as it is
just about mill-able.
It might take some experimenting and tweaking (maybe in a block of
plastic) to get the shape right, though.

> 2.  I have a live center for this mini-lathe, and if I really really snug
> down the tailstock clamp, it might make 200 + lbs of push.  Likely not
> enough to push it straight in.

You could perhaps augment the tailstock clamp with things clamped to
the bed behind it.
If it fails, you could probably finish it off with a hammer….

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Viesturs Lācis
2012/7/21 Erik Christiansen :
>
> In any event, I'd fix a long slender ballscrew, to avoid whipping, and
> rotate the nut.

I did this on the last machine I built with this exact intention in my mind.
The overall result - failure. I seriously doubt I will ever do that again.
Longest screw was 2800 mm long (other 2 were 1800 mm long), all of
them - 16 mm diameter, 10 mm pitch.

My main conclusion - the nut housing requires pretty precise machining
to match the central axis of the nut itself with the axis around which
that nut rotates in bearings.
I had some deviations there, so the rotation of the nut caused the
screw to vibrate, so the max speed ended up to be 5x smaller than
initially planned just to avoid excessive vibrations.

-- 
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If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Erik Christiansen
On 20.07.12 16:18, Jeshua Lacock wrote:
> I am sure with a 10-foot span that the horizontal ballscrews will sag
> a little from gravity. Is this much of a concern? Does anyone know of
> a trick to put some kind of support in the middle of the span? I can't
> think of any practical way.

One method which has been used on very long lathes is one or more
pivoting supports holding up the leadscrew. Imagine a cross-drilled rod
with a weight on one end. It will hang vertically on a bolt through the
hole. Now a segment of an arc (imagine a slim pie-slice of a V-belt pulley)
welded on the other end will support the leadscrew in the V, but be
pushed aside by the passing leadscrew nut housing, and slide under it,
to bob up again when it has passed.  

While that has been used in industry on older long lathes, it doesn't
seem ideal, since a cnc machine is likely to whack into it at speed, or
reverse at that one tiny point where the shape of the ballscrew nut
housing hasn't quite let it bob up, but sliding back under could be at
least high friction, if not an outright jam.

Those left/right alternating support legs, where striking the left one
from the right causes it to fold down, and pull up the right one behind
the leadscrew nut housing, by means of a link, are perhaps also not at
their best when struck at speed.

I'd be tempted to go for a horizontally retracting flat support,
reaching out under the ballscrew from the adjacent frame. Imagine a bit
of flat in a long slot, with the corners of the exposed edge cut
well back, forming a ramp nearly to the middle of the edge. When the
(also heavily chamfered) ballscrew nut housing whizzes by, it
progressively pushes the support strip back into the slot in the frame,
and progressively re-emerges as it passes. If the slot is deep, smooth,
and well lubricated, then the support ought to retract much like that
angled spring-loaded brass catch on domestic external doors. (The one
which locks you out without your keys, even if only once in life.)

If even that is too noisy when hit at speed, then the support could be
automatically retracted when the carriage is near (reed switch or
optical sensor), either pneumatically or by means of a small motor.

In any event, I'd fix a long slender ballscrew, to avoid whipping, and
rotate the nut. It is hard to image how vibration of a very long slender
ballscrew can be avoided if it is spun at speed.

Erik

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Hardly any sets of 10K words can be adequately described with pictures.


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Re: [Emc-users] Linuxcnc 5 axis coolness

2012-07-21 Thread charles green
since you probably have a computer, you probably also already have a laser.

--- On Fri, 7/20/12, andy pugh  wrote:

> From: andy pugh 
> Subject: Re: [Emc-users] Linuxcnc 5 axis coolness
> To: "Enhanced Machine Controller (EMC)" 
> Date: Friday, July 20, 2012, 3:59 AM
> On 20 July 2012 11:42, Claude
> Froidevaux 
> wrote:
> 
> > sometimes I think of LinuxCNC as a HAL platform, where
> G-code
> > interpreter is only one module, that can be
> instantiated if needed.
> 
> This is something I realised recently too. I have made a
> start on a
> GladeVCP GUI which imports an image file, then feeds that to
> a
> realtime component that generates an XY raster pattern and
> synchronised intensity value for laser rastering
> applications. There
> is no G-code anywhere in the system. Effectively the image
> file
> becomes the program.
> But as I don't have, nor intend getting, a laser, it has
> been rather
> pushed to the back-burner once I proved it could be done
> :-)
> 
> -- 
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Erik Christiansen
On 20.07.12 12:18, Jon Elson wrote:
> Erik Christiansen wrote:
> > Would it help if we again posted some advice on how to most easily
> > change the uids on one host to match another?
> >   
> Gee, something like :
> sudo chown -Rf x:y directory
> will do most of the job, then you need to make sure the group and owners
> exist.  Edit the file /etc/group and passwd with the right group and 
> user IDs.

Yes, but having posted a more verbose version of that last time IDs were
a problem, I wasn't going to push it a second time if it wasn't welcome.
However, it looks like the IDs are tidied up now, so we're denied that
quick fix.

Erik

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Re: [Emc-users] NFS hassles [Was: Spindle hooked to dc servo amp]

2012-07-21 Thread Erik Christiansen
On 20.07.12 10:51, Gene Heskett wrote:
> On Friday 20 July 2012 10:18:49 Erik Christiansen did opine:
> > Would it help if we again posted some advice on how to most easily
> > change the uids on one host to match another?
> 
> While that could I suppose be useful when the distro's involved are mix-n-
> match, I fail to see the utility of it when I am uid:gid 1000 on all 4 
> machines, all installed from our own 10.04-4 LTS install cd.

That's fair, since you've already done all we were suggesting. So that
source of trouble has been eliminated.

> Much more useful would be some real examples that all I'd need to translate 
> would be to my hostnames or even hardcoded addresses.  To my knowledge, 
> there does not seem to be a way to make these services startup like a 
> babbling idiot and tell us what they are doing, or why they can't do it.  
> That would be 1000's of times more useful.

True. When it's failing, what do the logfiles say? ISTR that it's one of
the first places you usually look, admittedly. The nfs-kernel-server
package unsurprisingly logs stuff in /var/log/kern.log, and seems to be
reasonably talkative, even when things are going well.

Without a hint from the logs, we're reduced to shooting in the dark, or
at least through a growing cloud of BP smoke of our own making. 

> ATM, my /etc/exports file contains 1 non-commented line:
> /home/gene/ coyote.coyote.den(rw,sync,no_subtree_check)

How does your DNS respond to that hostname, if you try a
"dig coyote.coyote.den", or if not, does at least
"ping coyote.coyote.den " pick up the right IP address?
(i.e. are we certain that the problem is in NFS?)
Just for comparison, I've gotten away with nothing more than lines like
this in /etc/exports:   /export/share 192.168.1.0/24(rw)

> On all machines with the FQDN of that machine edited in.
> 
> Similarly, the only active line in /etc/auto.master on all machines is:
> /net  -hosts

I've never tried autofs. In this case, it seems to be another potential
source of gremlins. Your aversion to editing /etc/fstab is noted, but if
we append a line to nfs mount a remote filesystem, it
(a) shouldn't interfere with preceding mounts, IIRC, and
(b) can be tested before shutting down, by invoking the mount command
just with either the filesystem or mountpoint as argument. That will cause
its /etc/fstab entry to be used for mounting, and prove the pudding.

Once that works, then editing finger-fumbles have been tested, and a
reboot need not be feared. (Later, autofs mounting could be tried, if
desired, once NFS is known to work.)

...

> When I was running pclos on this box, with its 2.6.38.8 kernel, this all 
> worked flawlessly except for the uid:gid problems when copying files so I 
> always had to become root and fix that.

Ah ... so the other boxes are unchanged, and the problem ought to be on
"this box". It's still a puzzle, without some logfile or cage-kicking clues.

> So how do I go about making autofs and nfs-kernel-server get all mouthy so 
> I can see where it fails?  Right now it all comes back 'OK' but doesn't 
> actually connect anyplace but on lathe.coyote.den, which does create a 
> /net/lathe subdirectory, but its empty.  The /net directories are empty 
> after many restarts of those 2 services in /etc/init.d on the other 2 
> boxes, this one and shop.coyote.den.  Lappy hasn't been out of the case 
> locally in a month or more and ATM is not on my priority list until I need 
> it.

Oh, not much is mounting at all? (I'd incorrectly recalled that it only
gummed up after some time.) All the more reason for testing nfs without
autofs. An IP-address-netmask pair, as worked for me, might also be
worth trying. 

If you can post what happens when the abovementioned sticks are poked
into the cage, we'll hopefully be a step closer to identifying the
gremlins.

Erik

-- 
In 80% aller Software-, Hardware-, etc. Probleme hilft die AEG-Methode: 
Ausschalten, Einschalten, Geht wieder.  OR
In 80% of all Software-, Hardware-, etc. problems, the AEG method helps:
Switch Off, Switch On, Goes again.
(Hmmm ... it's better in the original language.)

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Re: [Emc-users] [Off] Ballscrew Support?

2012-07-21 Thread Steve Blackmore
On Fri, 20 Jul 2012 20:00:10 -0400, you wrote:

>Sag is only the start of the problem.  The whip is going to be the real
>problem.  The ballnut is no holp holding it up at the limits of travel.

Not strictly true - the size needs to be CAREFULLY calculated for the
job in hand and the mounting method needs to be considered.

Good ballscrew manufacturers have tables that define limits for their
screws, but the examples I've looked at require both ends to be fixed
and max rotational speed of around 1000 rpm for a 3m long 25mm ballscrew
with loads kept below 2000 Kg.

As long as you follow manufacturers specs it isn't going to whip or
destroy the ballnut. That said, for a 10ft long screw I'd go bigger than
25mm :)

A Google search for 

ballscrew length versus diameter

gives lots of data.

www.techno-isel.com/Tic/H834/PDF/H834P011.pd

gives some good info.

Steve Blackmore
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Re: [Emc-users] Spindle hooked to dc servo amp

2012-07-21 Thread Steve Blackmore
On Fri, 20 Jul 2012 13:05:22 -0500, you wrote:

>Get well soon!  If you feel like experimenting - I think you would just 
>change
>
>net spindle-position encoder.0.position => motion.spindle-revs
>
>to
>
>net spindle-position encoder.0.position-interpolated => motion.spindle-revs

Thanks Sam - I'll give that a whirl and report back. 

Feeling much better and can see surprisingly well although I do look
like I've gone several rounds with Tyson . 

Steve Blackmore
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