date:20091011

On Sun, 11 Oct 2009 20:32:40 +0200, you wrote:

>same over here. I've also been used to check the tool board and only 
>start my lathe when the chuck wrench and other tools are there.
>One of my chucks was delivered with a wrench with a spring so it will 
>not even stay in the chuck by itself - a safety feature that was 
>developed to be removed ...
>
>Oh - also never ever remove the chips from your lathe or mill when it is 
>running otherwise this may happen: 
>http://www.youtube.com/watch?v=Nyj_6am7Q30
>I had my mill running at 6m/min (240 "/min), never tested but I am 
>afraid it does not stop when my arm is in between parts of the machine: 
>a 0.75" piece of aluminum just folded around the vise ...

All workshop machinery can be dangerous. 

When I was an apprentice in the 60's I had to work in every department
and was in the Coppersmith's shop at the time. The old guy teaching me
was cleaning up a large soldering iron on a bench grinder fitted with a
wire brush wheel. He must have done it thousands of times, this
particular day, for some reason the grinder dragged the iron and his
hand in. It ripped his thumb and forefinger off his hand, Not pretty - I
was stood next to him at the time.

Now you would think that would make me extra careful. 

It does, but I've still managed to get a sleeve caught in a lathe chuck,
when somebody spoke to me as I was working and I turned around.  

I was lucky, the shirt ripped easily and I only got a two inch gash in
my forearm. Believe me - It's extremely painful, you have the huge
bruise from the impact of the chuck jaws as well as the cuts!
(And it continues to hurt just as bad for days).

Steve Blackmore
--

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sunday 11 October 2009, Steve Blackmore wrote:
>On Sun, 11 Oct 2009 08:47:27 -0700, you wrote:
>>On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
>>... snip
>>
>>> A far at the pair of 50's is concerned, they will also stop it fairly
>>> quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some
>>> might call that a little brutal, but I have been doing it for at least a
>>> year with no ill effects that I have detected.  A single 50 would
>>> probably be fast enough, and certainly easier on the PM fields of the
>>> motor.
>>
>>That brings to mind, my Hardinge has a screw style chuck mount which
>>seems like Russian roulette when using aggressive decelerations. An A5
>>spindle is on my wish list.
>
>Been there, had an 8inch dia 4 jaw come off on me and dance around the
>shop, the Lexan window, behind where I was stood is still cracked ;)
>Easy enough to drill and tap a hole, fit a set screw, job sorted.
>
>Thankfully my current lathe has 3 studs with a camlock. The smallest
>chuck I have is 6 inch diameter and it's 3 inches deep. I can stop that
>in two turns from 3200 rpm without a brake, but why? I have yet to come
>across a practical reason to do that, apart from a bragging contest.

A reasonable stop is one that might not pull an arm off if it gets caught.  
But how would one go about setting up the SawStop sensing system on a lathe?  
Any manually activated method is way, way too slow.

In a turret head, cnc situation I could see where a stop in 2 revs from 3200 
might up production by 2% in a lights out mode, but would it be worth the 
stress on the drive parts?  Flat out, no.  That is a brutal stop to do that 
in 0.0375 seconds.  Even 10 times that long is gonna dump some serious heat 
someplace.

>The only possible theoretical reason is tapping, the drag off the tap,
>and the slowish speed means it stops pretty well instantly anyway. I
>must be doing it right, over the years I must have tapped many tens on
>thousands of blind and through holes and have yet to break a tap.
>
>These days I also "cheat" slightly and mainly use a Tapmatic SM4
>extending nose tap holder, makes life so simple :)
>
Yes, that _is_ cheating, and you are making me jealous. ;-)

OTOH, most of the taps I might use are in the 8-32, 6-32 and 6-48 range for 
size.  The 6-32 seems to be the most fragile, and I have had to edm to remove 
2 of them in the last 5 years.  Probably guaranteed breakage when you think 
you need such threads 90+% deep & use a fractional drill bit for the hole cuz 
that's all I have.  Nobody to blame but me.  Those were good Hansen taps too, 
but I went out to TSC and picked up a TI coated Mibro & finished the job 
doing as many holes with it as with both of the Hansens I broke combined.  
And it still looks sharp under a strong glass.  Go figure.

>Steve Blackmore
>--
>
>---
>--- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is
> the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
>___
>Emc-users mailing list
>Emc-users@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 
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)
The NRA is offering FREE Associate memberships to anyone who wants them.


/* First check any supplied i/o locations. User knows best.  */

- comment from drivers/net/ne.c

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control


On 10/11/2009 08:11 PM, Steve Blackmore wrote:
> Been there, had an 8inch dia 4 jaw come off on me and dance around the
> shop, the Lexan window, behind where I was stood is still cracked ;)
> Easy enough to drill and tap a hole, fit a set screw, job sorted.
>
> Thankfully my current lathe has 3 studs with a camlock. The smallest
> chuck I have is 6 inch diameter and it's 3 inches deep. I can stop that
> in two turns from 3200 rpm without a brake, but why? I have yet to come
> across a practical reason to do that, apart from a bragging contest.
>
> The only possible theoretical reason is tapping, the drag off the tap,
> and the slowish speed means it stops pretty well instantly anyway. I
> must be doing it right, over the years I must have tapped many tens on
> thousands of blind and through holes and have yet to break a tap.
>
> These days I also "cheat" slightly and mainly use a Tapmatic SM4
> extending nose tap holder, makes life so simple :)
>
> Steve Blackmore
> --
>
>

   Steve, the mini lathe is my test mule.  Once I'm done, I will either 
CNC my 12x36, and buy a bigger one, or build a slant bed.  Also, I have 
one of my mill-drills torn down, that I will be CNCing.  I want the 
capability to do rigid tapping with tool changes, so spindle braking is 
a valid option.

   Right now, I'm just learning how to get everything working.  I worked 
with ladder logic many many years ago, but this HAL thing is giving me 
headaches.



-
Ne M'oubliez   ---Family Motto
Hope for the best, plan for the worst   ---Personal Motto

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.


--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On 10/11/2009 07:26 PM, Gene Heskett wrote:
>
> Humm, I believe you are correct.  TBT its been years since i had the 3 jaw
> mounted, the scroll was junk in the replacement 4" I bought for it, plus its
> so easy to center up something in the 4 jaw, that I have never felt the urge
> to switch it back.
>
I haven't gotten the 4 jaw for mine... yet.  but I have a MT3 - ER40 set 
I can use in the mean time.

   The lathe was given to me after it had been sitting outside for 2 
years, so the 3 jaw, the compound, and the tool post are toast.  I feel 
lucky that the ways, and cross slide, were covered in oil, grease, gunk, 
droppings, etc.  and weren't pitted.  I just got done repairing the 
electronics, and replacing the bearings, so now I'm at the point where I 
need to align everything.  I wasn't planning on using the compound, and, 
I can see another QCTP in my future. :)

>>> To change the subject a wee bit, does anyone have a link to someone
>>> selling prefabbed optical pieces
>>>
>>Do you mean like this?
>> http://littlemachineshop.com/products/product_view.php?ProductID=1945
>>
>>  
> Yes, but more likely a combined unit since space is a bit limited in there.
> I've even considered demolishing an old ball type mouse, and setting one unit
> on a slant to read as phase A and index,&  the other to read phase B, if the
> gap is wide enough to take that piece of 16 gauge alu I made it from.
>
> Those mice are now almost collectors items, I bet I've tossed 10 of them out,
> broken cables&  what not.  But that does start another train of thought here.
>
   If I had a dollar for every mouse I threw away...

   I bought that interrupter from LMS, along with the 40 tooth wheel, so 
I could test things with it, but I have several old inkjet, and laser 
printers to liberate parts from.  Come to think of it, I may have a 
couple of old mice lurking around somewhere...  Inkjet printers have 
servo motors, so they need some sort of encoder feedback to operate.  
I'm gravitating towards taking one of the encoders out, and seeing what 
I can do with it.

-
Ne M'oubliez   ---Family Motto
Hope for the best, plan for the worst   ---Personal Motto

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sun, 11 Oct 2009 08:47:27 -0700, you wrote:

>On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
>... snip
>> A far at the pair of 50's is concerned, they will also stop it fairly 
>> quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some might 
>> call that a little brutal, but I have been doing it for at least a year with 
>> no ill effects that I have detected.  A single 50 would probably be fast 
>> enough, and certainly easier on the PM fields of the motor.
>
>That brings to mind, my Hardinge has a screw style chuck mount which
>seems like Russian roulette when using aggressive decelerations. An A5
>spindle is on my wish list.

Been there, had an 8inch dia 4 jaw come off on me and dance around the
shop, the Lexan window, behind where I was stood is still cracked ;)
Easy enough to drill and tap a hole, fit a set screw, job sorted.

Thankfully my current lathe has 3 studs with a camlock. The smallest
chuck I have is 6 inch diameter and it's 3 inches deep. I can stop that
in two turns from 3200 rpm without a brake, but why? I have yet to come
across a practical reason to do that, apart from a bragging contest.

The only possible theoretical reason is tapping, the drag off the tap,
and the slowish speed means it stops pretty well instantly anyway. I
must be doing it right, over the years I must have tapped many tens on
thousands of blind and through holes and have yet to break a tap. 

These days I also "cheat" slightly and mainly use a Tapmatic SM4
extending nose tap holder, makes life so simple :)

Steve Blackmore
--

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sunday 11 October 2009, Steve Blackmore wrote:
>On Sun, 11 Oct 2009 10:16:46 -0400, you wrote:
>>So in short, it should be called a VSD, not a VFD.  A
>>VFD would need a 3 phase motor, and made to run synchronous if it is to
>> have usable torque at low speeds.  Minor nit picking to be sure but there
>> is a world of difference in the actual hardware.
>
>As I said, there are several different boards, the latest designs use 3
>phase motors, with an encoder on the motor shaft, giving feedback to a
>VFD.
>
Ah, that explains it then, thanks Steve.  How is the torque at crawl speeds 
with that?, or does the motor have a hard (magnetically) steel armature so 
they operate synchronous up to the stall torque?  More like a stepper with 3 
phases I'd assume, and low speed torque should be abundant then.

I've considered getting an X3, but my most recent purchase, a Rikon 10-325 
bandsaw, has about worn out the better half's tolerance.  OTOH, she is ohhing 
and ahhing over the new wooden panels I am installing one by one in the 
kitchen cabinet doors & eventually drawers too.  Butternut, book matched, 
with a slight tint of cherry stain in the Sam's recipe finish I'm using.  Sam 
being Sam Maloof, a designated National Treasure woodworker who died last may 
at 92.

>Steve Blackmore
>--
>
>---
>--- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is
> the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
>___
>Emc-users mailing list
>Emc-users@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 
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)
The NRA is offering FREE Associate memberships to anyone who wants them.


A day without orange juice is like a day without orange juice.

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sun, 11 Oct 2009 10:16:46 -0400, you wrote:


>So in short, it should be called a VSD, not a VFD.  A 
>VFD would need a 3 phase motor, and made to run synchronous if it is to have 
>usable torque at low speeds.  Minor nit picking to be sure but there is a 
>world of difference in the actual hardware.

As I said, there are several different boards, the latest designs use 3
phase motors, with an encoder on the motor shaft, giving feedback to a
VFD.

Steve Blackmore
--

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sunday 11 October 2009, Mark Cason wrote:
>Gene,
>
>   On my 7x12 (Sieg C2 style), the mounting plate for the chuck is an
>integral part of the spindle, as shown here:
>http://littlemachineshop.com/products/product_view.php?ProductID=1341
>
Humm, I believe you are correct.  TBT its been years since i had the 3 jaw 
mounted, the scroll was junk in the replacement 4" I bought for it, plus its 
so easy to center up something in the 4 jaw, that I have never felt the urge 
to switch it back.

>  Three studs/nuts hold the chuck to the lathe.  There is another set of
>holes for mounting a 4 jaw, that shares one hole with the 3 jaw (6 holes
>total).  I think of it more like a poor mans version of a D1-4.

I remember that now.

>So, the
>only concern with braking resistors, is making sure that the part that
>is being held does not get slung out of the machine.  I've been toying
>with the idea of using some 1/4" Lexan to surround the machine, so I can
>use flood coolant.  I'm also hoping that it will contain any minor
>mishaps inside, instead of exploding across the shop.
>   (My drawing/programming skills are very poor right now)
>
>> To change the subject a wee bit, does anyone have a link to someone
>> selling prefabbed optical pieces
>
>   Do you mean like this?
>http://littlemachineshop.com/products/product_view.php?ProductID=1945
>
Yes, but more likely a combined unit since space is a bit limited in there.  
I've even considered demolishing an old ball type mouse, and setting one unit 
on a slant to read as phase A and index, & the other to read phase B, if the 
gap is wide enough to take that piece of 16 gauge alu I made it from.

Those mice are now almost collectors items, I bet I've tossed 10 of them out, 
broken cables & what not.  But that does start another train of thought here.

>Kirk,
>
>   I have two treadmill motors, 120VDC - 1100 watts, that I had
>considered using, but they both have the rotation listed as CCW.  I
>haven't taken them apart, but I'm assuming they both have angled brushes
>that allow them to run in one direction.  Are yours the same way??  If
>so, how well do they work when turning backwards?
>
>
>
>Oh, and Peter, I forgot to mention, your bunny multiplied...
:)
>
>-
>
>Ne M'oubliez   ---Family Motto
>Hope for the best, plan for the worst   ---Personal Motto
>
>(\__/)
>(='.'=) This is Bunny. Copy and paste bunny into your
>(")_(") signature to help him gain world domination.
>
>On 10/11/2009 11:53 AM, Gene Heskett wrote:
>> On Sunday 11 October 2009, Kirk Wallace wrote:
>>> On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
>>> ... snip
>>>
 A far at the pair of 50's is concerned, they will also stop it fairly
 quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some
 might call that a little brutal, but I have been doing it for at least
 a year with no ill effects that I have detected.  A single 50 would
 probably be fast enough, and certainly easier on the PM fields of the
 motor.
>>>
>>> That brings to mind, my Hardinge has a screw style chuck mount which
>>> seems like Russian roulette when using aggressive decelerations.
>>
>> That might depend on how heavy it is, and how tightly it locks into home
>> when it is installed.  Certainly a 50 pound or more chuck, unscrewed and
>> still spinning 1900 rpms, could do a lot of damage to both the person and
>> the equipment.  My chucks are smaller of course, and normal change is to
>> unbolt them from a face plate, but that face plate is still screwed to
>> the spindle at whatever size thread is on a 7x12's spindle.  I believe I
>> took it off once but don't recall now how I managed to get it loose as
>> there is not a ready method to lock the spindle in that little machine.
>>
>> That thought does beg for some method of locking it onto the spindle nose
>> though, and one that would not effect the accuracy of the mounting, so
>> set screws are probably out.  As is double nutting, no space for the
>> inner nut.
>>
>>> An A5
>>> spindle is on my wish list.
>>>
>>> Another thought, for DC spindle motors, I've done a bench setup with a
>>> tread mill motor and Jon's PWM drive. With a minor modification, it
>>> worked very well. With its four quadrant feature, I suppose it could
>>> allow some axis capability. If one needs a new DC (or universal) drive,
>>> this could be a cost effective way to get one. Plus you don't need to
>>> monkey with an analog signal.
>
>---
>--- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is
> the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
>___
>Emc-users mailing list
>Emc-us

[Emc-users] Laser cutters and engravers

2009-10-11 Thread Karl Schmidt

There are several Chines systems (Jcut) - less than $4000 BUT - they use
proprietary windoze stuff
and a dongle - no Linux support. Anyone know of something similar that is Linux
based? ( I no longer
run ANY Windoze systems)

(It has occurred to me that the internal controller might be EMC in their
firmware...)

http://cgi.ebay.com/CO2-Laser-Engraver-laser-engraving-machine-laser-cutter_W0QQitemZ110411431386QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19b508bdda

Be aware that if you order it from China - it is sort of a kit - I've heard of
them new and not
working - there is supposed to be a guy in Canada that sells them assembled and
working.

Anyone here working on such things? Or has tied these into EMC? OR links that I
haven't found?

The core hardware - a CO2 LASER and a light weight X-Y - is not expensive -
safety interlocks -
tying it all together, exhaust systems is the hitch.

Karl Schmidt EMail k...@xtronics.com
Transtronics, Inc. WEB http://xtronics.com
3209 West 9th Street Ph (785) 841-3089
Lawrence, KS 66049 FAX (785) 841-0434

Fundamentals always win in the long term, but as Keynes said:
"The market can stay irrational longer than you can stay solvent."

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

Gene,

   On my 7x12 (Sieg C2 style), the mounting plate for the chuck is an 
integral part of the spindle, as shown here:
http://littlemachineshop.com/products/product_view.php?ProductID=1341

  Three studs/nuts hold the chuck to the lathe.  There is another set of 
holes for mounting a 4 jaw, that shares one hole with the 3 jaw (6 holes 
total).  I think of it more like a poor mans version of a D1-4.  So, the 
only concern with braking resistors, is making sure that the part that 
is being held does not get slung out of the machine.  I've been toying 
with the idea of using some 1/4" Lexan to surround the machine, so I can 
use flood coolant.  I'm also hoping that it will contain any minor 
mishaps inside, instead of exploding across the shop.
   (My drawing/programming skills are very poor right now)

> To change the subject a wee bit, does anyone have a link to someone selling
> prefabbed optical pieces
   Do you mean like this?
http://littlemachineshop.com/products/product_view.php?ProductID=1945


Kirk,

   I have two treadmill motors, 120VDC - 1100 watts, that I had 
considered using, but they both have the rotation listed as CCW.  I 
haven't taken them apart, but I'm assuming they both have angled brushes 
that allow them to run in one direction.  Are yours the same way??  If 
so, how well do they work when turning backwards?



Oh, and Peter, I forgot to mention, your bunny multiplied...

-

Ne M'oubliez   ---Family Motto
Hope for the best, plan for the worst   ---Personal Motto

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.


On 10/11/2009 11:53 AM, Gene Heskett wrote:
> On Sunday 11 October 2009, Kirk Wallace wrote:
>
>> On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
>> ... snip
>>
>>  
>>> A far at the pair of 50's is concerned, they will also stop it fairly
>>> quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some
>>> might call that a little brutal, but I have been doing it for at least a
>>> year with no ill effects that I have detected.  A single 50 would
>>> probably be fast enough, and certainly easier on the PM fields of the
>>> motor.
>>>
>> That brings to mind, my Hardinge has a screw style chuck mount which
>> seems like Russian roulette when using aggressive decelerations.
>>  
> That might depend on how heavy it is, and how tightly it locks into home when
> it is installed.  Certainly a 50 pound or more chuck, unscrewed and still
> spinning 1900 rpms, could do a lot of damage to both the person and the
> equipment.  My chucks are smaller of course, and normal change is to unbolt
> them from a face plate, but that face plate is still screwed to the spindle
> at whatever size thread is on a 7x12's spindle.  I believe I took it off once
> but don't recall now how I managed to get it loose as there is not a ready
> method to lock the spindle in that little machine.
>
> That thought does beg for some method of locking it onto the spindle nose
> though, and one that would not effect the accuracy of the mounting, so set
> screws are probably out.  As is double nutting, no space for the inner nut.
>
>
>
>> An A5
>> spindle is on my wish list.
>>
>> Another thought, for DC spindle motors, I've done a bench setup with a
>> tread mill motor and Jon's PWM drive. With a minor modification, it
>> worked very well. With its four quadrant feature, I suppose it could
>> allow some axis capability. If one needs a new DC (or universal) drive,
>> this could be a cost effective way to get one. Plus you don't need to
>> monkey with an analog signal.
>>
>>  
>

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

2009-10-11 Thread Rob Jansen

same over here. I've also been used to check the tool board and only 
start my lathe when the chuck wrench and other tools are there.
One of my chucks was delivered with a wrench with a spring so it will 
not even stay in the chuck by itself - a safety feature that was 
developed to be removed ...

Oh - also never ever remove the chips from your lathe or mill when it is 
running otherwise this may happen: 
http://www.youtube.com/watch?v=Nyj_6am7Q30
I had my mill running at 6m/min (240 "/min), never tested but I am 
afraid it does not stop when my arm is in between parts of the machine: 
a 0.75" piece of aluminum just folded around the vise ...

Rob

Stuart Stevenson wrote:
> I was taught to never, never, never take your hand off a chuck wrench 
> in the
> chuck (never leave the wrench in the chuck) and never, never, never start a
> scroll chuck without something chucked in the chuck (unless you want to eat
> a jaw).
>
>   

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

2009-10-11 Thread Stuart Stevenson

> That brings to mind, my Hardinge has a screw style chuck mount which
> seems like Russian roulette when using aggressive decelerations. An A5
> spindle is on my wish list.
>
>
I was taught to never, never, never take your hand off a chuck wrench in the
chuck (never leave the wrench in the chuck) and never, never, never start a
scroll chuck without something chucked in the chuck (unless you want to eat
a jaw).

-- 
you can lead a person to knowledge
but you cannot make him think
--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sunday 11 October 2009, Kirk Wallace wrote:
>On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
>... snip
>
>> A far at the pair of 50's is concerned, they will also stop it fairly
>> quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some
>> might call that a little brutal, but I have been doing it for at least a
>> year with no ill effects that I have detected.  A single 50 would
>> probably be fast enough, and certainly easier on the PM fields of the
>> motor.
>
>That brings to mind, my Hardinge has a screw style chuck mount which
>seems like Russian roulette when using aggressive decelerations.

That might depend on how heavy it is, and how tightly it locks into home when 
it is installed.  Certainly a 50 pound or more chuck, unscrewed and still 
spinning 1900 rpms, could do a lot of damage to both the person and the 
equipment.  My chucks are smaller of course, and normal change is to unbolt 
them from a face plate, but that face plate is still screwed to the spindle 
at whatever size thread is on a 7x12's spindle.  I believe I took it off once 
but don't recall now how I managed to get it loose as there is not a ready 
method to lock the spindle in that little machine.

That thought does beg for some method of locking it onto the spindle nose 
though, and one that would not effect the accuracy of the mounting, so set 
screws are probably out.  As is double nutting, no space for the inner nut.

To change the subject a wee bit, does anyone have a link to someone selling 
prefabbed optical pieces I could use with the attached piece of .ngc that 
cuts the encoder wheel I have installed on my 7x12?  Its hole spacing does 
not lend itself well to individual interrupters on perfboard.

>An A5
>spindle is on my wish list.
>
>Another thought, for DC spindle motors, I've done a bench setup with a
>tread mill motor and Jon's PWM drive. With a minor modification, it
>worked very well. With its four quadrant feature, I suppose it could
>allow some axis capability. If one needs a new DC (or universal) drive,
>this could be a cost effective way to get one. Plus you don't need to
>monkey with an analog signal.
>

-- 
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)
The NRA is offering FREE Associate memberships to anyone who wants them.

Your true value depends entirely on what you are compared with.
( spindle-encoder.ngc )
( by Lawrence Glaister VE7IT )
( Sept 15 2007 )
( lerman - thankyou for named variables and owords very cool )
( Cut from arborite stock with 0.049" endmill. )
( This encoder ring mounts on the lathe spindle drive pulley. )
( Ring encoder provides A,B,Z phases using 3 H21TLB slot sensors. )
( The H21TLB sensor use 5v and can directly drive parallel port pins. )
( The sensor apeture is 0.035", so I used double that for the slot length )
( to allow for some runout on mounting the ring. )
( The main constraint is that the main track opto has to be able to physically )
( read the inner track... reaching over the outer index track )
( To preview what it will look like, set _endmill_dia = 0.0 below. )
( With a high speed spindle you may be able to cut to depth in 1 pass. )
( This example only cuts to -0.020... this can be edited and the program )
( rerun to do 2 passes )

(==)
(= Subroutines )
( cuts a circle at request diameter around x,y to requested depth )
o100 sub
  (Subroutine to do a circle)
  ( P1=X center P2=Y center P3-diameter P4=depth P5=feedrate )
  g0 z#<_safe_Z>
  g0 x[#1-[#3/2]] y#2
  g1 F[#5/2] z#4
  g2 F[#5] x[#1-[#3/2]] y#2 i[#3/2] j0
  g0 z#<_safe_Z>
o100 endsub

(==)
(=== Define Constants/Variables ===)
#<_endmill_dia> = 0.047   ( endmill diameter )

#<_safe_Z> = 0.100( safe Z height )
#<_Zcut> = -0.050 ( Z depth to cut encoder 
elements )
#<_feedrate> = 5.0( cutting feedrate )

( define characteristics of encoder and index tracks )
#<_main_track_dia> = 7.250( diameter of main signal 
track )
#<_index_track_dia> = [#<_main_track_dia> + 0.140] ( diameter of index track )
#<_inside_cutout> = 5.500 ( diameter of interior cutout == 
inside of pulley)
#<_outside_cutout> = 7.525( diameter of exterior cutout 
~= enough space for tracks)
#<_encoder_cycles> = 90   ( number of slots to cut 180 
* 4 == 1/2 degreee resolution)
#<_slotlen> = 0.090   ( finished slot length for 1 encoder 
element ~= sensor aperture + runout )

( define 3 params for the mou

Re: [Emc-users] Spindle Control

2009-10-11 Thread Kirk Wallace

On Sun, 2009-10-11 at 10:27 -0400, Gene Heskett wrote:
... snip
> A far at the pair of 50's is concerned, they will also stop it fairly 
> quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some might 
> call that a little brutal, but I have been doing it for at least a year with 
> no ill effects that I have detected.  A single 50 would probably be fast 
> enough, and certainly easier on the PM fields of the motor.

That brings to mind, my Hardinge has a screw style chuck mount which
seems like Russian roulette when using aggressive decelerations. An A5
spindle is on my wish list.

Another thought, for DC spindle motors, I've done a bench setup with a
tread mill motor and Jon's PWM drive. With a minor modification, it
worked very well. With its four quadrant feature, I suppose it could
allow some axis capability. If one needs a new DC (or universal) drive,
this could be a cost effective way to get one. Plus you don't need to
monkey with an analog signal.
-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] WG: Re: WG: Re: axis and batch processing

2009-10-11 Thread Alex Joni

I renamed it to:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?SubProgramFiles

Regards,
Alex


--
From: "Andy Pugh" 
Sent: Sunday, October 11, 2009 3:56 PM
To: "Enhanced Machine Controller (EMC)" 
Subject: Re: [Emc-users] WG: Re: WG: Re: axis and batch processing

> 2009/9/30 Chris Epicier :
>
>> Thank you very much for the quick reply. Stephen had
>> pointed me to this also, I have amended the files
>> accordingly and still get "Bad Number Format".
>
> I was fiddling around with this last night, and got it working for my
> application.
> I suspect that the reason you didn't see any improvement when you
> modified the sub-program files is that Axis doesn't seem to reload
> them when you reload the main file. The only way I have found to make
> changes to a subprogram stick is to quit and reload Axis. (I didn't do
> exhaustive testing, though, I was just trying to get it to work)
>
> After some discussion on IRC tom3p came up with this Wiki article:
> http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?SubProgamFiles
> (Unfortunately there is a typo in the page title which might make it
> hard to find)
>
> -- 
> atp
>
> --
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users



>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.421 / Virus Database: 270.14.9/2427 - Release Date: 10/10/09 
> 06:39:00
> 

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sunday 11 October 2009, Mark Cason wrote:

>   Gene, I see you and I have the same idea for a spindle brake, but, is
>10 ohms enough??  I was originally thinking of a pair of 50 ohm 10 watt
>resistors in parallel (since I already have them).  I could always throw
>another 1 or 2 on, to decrease the ohm's.

The heat generated is not sufficient to noticeably warm the 10 watt resistor 
I had at hand, and since it is a wire wound, unlike a carbon resistor the 
heat pulse has little effect on it in terms of long term life.

A far at the pair of 50's is concerned, they will also stop it fairly 
quickly.  Mine is maybe 2 or 3 turns from the full 2500 rpms, and some might 
call that a little brutal, but I have been doing it for at least a year with 
no ill effects that I have detected.  A single 50 would probably be fast 
enough, and certainly easier on the PM fields of the motor.

-- 
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)
The NRA is offering FREE Associate memberships to anyone who wants them.

You will be given a post of trust and responsibility.

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

On Sunday 11 October 2009, Steve Blackmore wrote:
>On Sat, 10 Oct 2009 23:02:59 -0500, you wrote:
>>  The SX3 or Super X3 sold by Grizzley (G0619) does use the digital
>>control.  The X3 sold by Harbor Freight and also Grizzley (G0463)  use a
>>speed potentiometer.
>
>All are suitable for connection to an analogue input to control speed,
>we've done it in testing.
>
>The problem is there are several different control boards, and motor
>types. Certainly the early X1, X2, X3 types with DC motors had the pot
>referenced to mains neutral. The later models with Brushless AC motors
>have a VFD, and the additional board that is connected via a ribbon
>cable is isolated. It still accepts a 0-10V analogue signal, from the
>other board at the back of the up/down speed buttons and LCD readout.
>
>Whether isolated or not, it would be foolish to supply anything other
>than signal from an isolated board like the following, for example
>
>http://www.cnc4pc.com/Store/osc/product_info.php?cPath=25&products_id=58
>
>Steve Blackmore

That also would work nicely, however I think that VFD would be a miss-use of 
the 'lingo'.  Those drive controllers are not feeding a variable Frequency to 
the motors at all.  In the one that I'm using, I have always called it a VSD 
rather than a VFD because its frequency is semi-fixed and not related to how 
fast the motor is running.  It functions as a switch, but uses a big hexfet 
to do the switching (I know, I blew mine and replaced it with an even better 
rated unit scavenged from an old PC power supply) so it is not married to the 
powerline frequency in order to turn off the SCR or Thyristor.  Mine seems to 
run at a middle audio rate that is not synchronous with the line frequency at 
all, and does the speed control using a pulse width modulated scheme to turn 
the hexfet on and off.  I suspect the X3 unit is pretty similar, with a 
better output stage.  So in short, it should be called a VSD, not a VFD.  A 
VFD would need a 3 phase motor, and made to run synchronous if it is to have 
usable torque at low speeds.  Minor nit picking to be sure but there is a 
world of difference in the actual hardware.

-- 
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)
The NRA is offering FREE Associate memberships to anyone who wants them.

Bore, n.:
A guy who wraps up a two-minute idea in a two-hour vocabulary.
-- Walter Winchell

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Encoders

On Sunday 11 October 2009, Sven Wesley wrote:
>2009/10/11 Gene Heskett 
>
>> [Gene gives a lesson]
>
>Sometimes I wonder if I shouldn't take all these mail and make a book out
> of them. :)

Be my guest as long as you give a credit line.  I did have a copyright notice 
in my sig, but its been 30+ years since my musings were actually made into a 
competing commercial product.  Now I'm just another old fart who has to 
expound on this stuff to keep it fresh and sufficiently accurate for use in 
my own mind, whats left of it.  My biggest fear now is 'do I have it right' 
when I go off on something that seems more widely miss-understood than it 
should be.  And I get a certain personal pleasure out of trying to put some 
of the stuff I've dealt with for 60 years, into a format that really does 
educate the reader.  As in any field of endeavor, one can get lost in the 
'lingo' of the work, and the (fill in avocation here) who needs to do this is 
working in a different lingo, it can be confusing to bridge that language 
gap.  I try, but don't always succeed.  Don't be afraid to call me out when I 
blow it.

>But the whole discussion makes me think of another idea I had one time. Why
>aren't we using optical wires?
>They are cheap (cheaper than copper cables), can be extremely long and
>they'll never pickup noise, and on top of that the encoder can be passive.
>One fibre for light feed to the encoder, the encoder only consists of a
>fibre splitter and an optical wheel. Three fibres return A/B/Index channels
>and all the logic can be inside the driver.
>
Other than the expense of the fittings, and the often very pricy machines 
needed for doing the cutting and splicing, no reason whatsoever for the 
relatively low data rates we are using.  However I don't know as I'd say they 
were interference free.  If room florescent light can get in, there is that 
possibility.  But most of that stuff runs in the infrared range because the 
clad coated glass fiber is more transparent there, and silicon can easily 
generate fairly high powers, and detect, stuff in the 880 nanometer range.  

When the local cable decided we should be hooked up by fiber since their new 
head end was at a very low elevation making an off-air pickup very difficult 
to do, they brought a fiber to the tv station but made us buy the optical 
relays, which were about $9k for both ends, capable of doing 4 channels of 
video with stereo audio on all 4.  We are now using all 4 channels too.  In 
testing the final splices, they made the local one 3 times, but the net 
result was a .3 db loss in the 39 kilometers of fiber.

For what we need to do, we could almost do it in the hobby shop plastic fiber 
they sell so you only need one lamp to light up all the twinklies on your 
models.  But I suspect its lifetime would be limited by the aging and 
yellowing of the plastic.  Real glass would be better in that regard.  And 
real glass comes bound in an opaque and abrasion resistant covering.

This might be a place where an enterprisingly minded individual could make up 
some of this product if it could be made at copper competitive prices.  That, 
I rather doubt unless the military has needs that would underwrite the 
developments cost.

An excellent idea on the face of it.  But the first to do it _is_ going to 
burn through some money getting it right I fear.

-- 
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)
The NRA is offering FREE Associate memberships to anyone who wants them.

In practice, failures in system development, like unemployment in Russia,
happens a lot despite official propaganda to the contrary.
-- Paul Licker

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Encoders

2009-10-11 Thread Steve Stallings

Dang, the URL wrapped, and the web site uses long
search engine URLs for almost everything. Ah... here
is a shorter URL to just a datasheet

http://www.micronor.com/products/files/MR312/MDS_MR312.pdf

> -Original Message-
> From: Steve Stallings [mailto:steve...@newsguy.com] 
> Sent: Sunday, October 11, 2009 8:59 AM
> To: 'Enhanced Machine Controller (EMC)'
> Subject: Re: [Emc-users] Encoders
> 
> Passive fiber optic rotary encoders do exist and have many 
> benefits. Unfortunately, low cost is not among them. See:
> 
>  
> http://www.micronor.com/products.php?category=Fiber%20Optic%20
> Rotary%20Encod
> ers&offset=0
> 
> 
> 
> > -Original Message-
> > From: Sven Wesley [mailto:svenne.d...@gmail.com]
> > Sent: Sunday, October 11, 2009 3:32 AM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Encoders
> > 
> > 2009/10/11 Gene Heskett 
> > 
> > > [Gene gives a lesson]
> > >
> > 
> > Sometimes I wonder if I shouldn't take all these mail and 
> make a book 
> > out of them. :)
> > 
> > But the whole discussion makes me think of another idea I had one 
> > time. Why aren't we using optical wires?
> > They are cheap (cheaper than copper cables), can be 
> extremely long and 
> > they'll never pickup noise, and on top of that the encoder can be 
> > passive.
> > One fibre for light feed to the encoder, the encoder only 
> consists of 
> > a fibre splitter and an optical wheel. Three fibres return 
> A/B/Index 
> > channels and all the logic can be inside the driver.
> > 
> > 
> > --S
> > --
> > 
> > Come build with us! The BlackBerry(R) Developer Conference in 
> > SF, CA is the only developer event you need to attend this 
> > year. Jumpstart your developing skills, take BlackBerry 
> > mobile applications to market and stay ahead of the curve. 
> > Join us from November 9 - 12, 2009. Register now!
> > http://p.sf.net/sfu/devconference
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> > 
> 
> 
> --
> 
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. 
> Jumpstart your
> developing skills, take BlackBerry mobile applications to 
> market and stay 
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
> 


--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Encoders

2009-10-11 Thread Steve Stallings

Passive fiber optic rotary encoders do exist and have
many benefits. Unfortunately, low cost is not among
them. See:

 
http://www.micronor.com/products.php?category=Fiber%20Optic%20Rotary%20Encod
ers&offset=0



> -Original Message-
> From: Sven Wesley [mailto:svenne.d...@gmail.com] 
> Sent: Sunday, October 11, 2009 3:32 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] Encoders
> 
> 2009/10/11 Gene Heskett 
> 
> > [Gene gives a lesson]
> >
> 
> Sometimes I wonder if I shouldn't take all these mail and 
> make a book out of them. :)
> 
> But the whole discussion makes me think of another idea I had 
> one time. Why aren't we using optical wires?
> They are cheap (cheaper than copper cables), can be extremely 
> long and they'll never pickup noise, and on top of that the 
> encoder can be passive.
> One fibre for light feed to the encoder, the encoder only 
> consists of a fibre splitter and an optical wheel. Three 
> fibres return A/B/Index channels and all the logic can be 
> inside the driver.
> 
> 
> --S
> --
> 
> Come build with us! The BlackBerry(R) Developer Conference in 
> SF, CA is the only developer event you need to attend this 
> year. Jumpstart your developing skills, take BlackBerry 
> mobile applications to market and stay ahead of the curve. 
> Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
> 


--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

Hubert,

   Here is a web site that shows the schematics for the FC350BJ controller
http://anivo.com/reed/G8689_cont/g8689_cont.htm

   The main difference between it, and mine (FC250J), is that the FC250J 
has a low speed reverse function that prevents the spindle from turning 
more than a couple hundred RPM's in reverse.

   I am currently building a mini lathe out of a Homier 7x12 that was 
given to me.  It is currently spread across my bench in a couple dozen 
pieces, and I just (yesterday) got the electronics working by replacing 
the power mosfets.

   BUT...  I've been wondering, instead of taking a PWM signal from the 
computer, converting it to +10v, and then having the controller convert 
it back to PWM, to drive the mosfets, why can't the mosfets be run via a 
opto-isolator from the computer, with a encoder wheel on the spidle to 
handle speed/position feedback?

   I drew up a very simple circuit a couple of weeks ago, to do just 
that, 2 DPDT relays, one for spindle on/off, with a power resistor on 
the NC side, and the second for FWD/REV, and a opto-isolator powering 
two mosfets.

   I bought 2 extra mosfets, a 40 tooth encoder wheel, and a 
opto-interrupter from LMS, and I have most of the other bits, but, I'm 
still trying to figure out which opto-isolator would be the best to use.

   It will be a several weeks before I could begin trying to test this 
idea, but I don't see why it won't work.  If anybody else has tried 
this, please, I would like to know.

   Gene, I see you and I have the same idea for a spindle brake, but, is 
10 ohms enough??  I was originally thinking of a pair of 50 ohm 10 watt 
resistors in parallel (since I already have them).  I could always throw 
another 1 or 2 on, to decrease the ohm's.

-
Ne M'oubliez   ---Family Motto
Hope for the best, plan for the worst   ---Personal Motto

(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.

On 10/10/2009 11:02 PM, Hubert Bahr wrote:
> Peter
>The SX3 or Super X3 sold by Grizzley (G0619) does use the digital
> control.  The X3 sold by Harbor Freight and also Grizzley (G0463)  use a
> speed potentiometer.  My first attempt will be to use the VFD outputs of
> the Gecko G540 which provides an opto isolated pwm to analog reference.
> In its case it is limited to 12 volts so my first job is to determine
> the safest place to measure the voltage across the pot and then measure
> it.  I was a radar technician in the mid 60's and then went back to get
> my BSE.  So I am very leery of floating references.  As you say these
> voltages may be anywhere from 7 to 15 volts.  I can probably use the
> G540 pins as long as they are between 5 to 12 volts.  I will post my
> findings.  Physical inspection of the control boards in the two machines
> reveals different animals in types and quantity of components.
> Hopefully I will not have to reverse engineer them to get them to work.
>
> Hubert
>
> Peter Homann wrote:
>
>> Hi Hubert,
>>
>> You need to be careful connecting to the pot inputs of a lot of these type of
>> speed controllers. The usually put a DC voltage of anywhere between 7V to 15V
>> across the potentiometer. The kicker is that this voltage is generated via a
>> zener shunt regulator and the control voltage is actually 7V-15V below the
>> mains voltage.
>>
>> You need to ensure that any pc control connection to this is isolated.  I 
>> have
>> a number of products including the DC-03 that take a pwm signal from the PC
>> and convert this into an isolated dc control voltage that is suitable for
>> controlling many types of DC motor controllers and VFDs.
>>
>> http://homanndesigns.com/store/index.php?main_page=product_info&cPath=1&products_id=21
>>
>>
>> As to the X3, I thought it used a brushless motor and the speed controller 
>> was
>> digital with buttons for speed up/down and not suitable for accepting an
>> analog control input that replaces a manual speed potentiometer.
>>
>> Cheers,
>>
>> Peter
>>
>>
>> Hubert Bahr wrote:
>>
>>  
>>> Just some thinking out loud!!  Is it possible to put a rotation detector
>>> on a spindle, use it as an input to EMC and then have EMC drive some
>>> type of digital to analog converter to change the speed until it agrees
>>> with the  desired setting?  Based on some past discussions on the list,
>>> I believe the answer to be yes.  If so, what type of rotation detection
>>> is needed?  What is the best way to convert the EMC output to be a
>>> control force for the spindle?
>>>I am talking about a spindle on the X3 Seig Mill.  I am planning to
>>> convert the current gear drive to a two range belt drive, and since the
>>> current controller appears to use a pot to adjust the speed and a switch
>>> to change direction I believe I could use some type of control voltage
>>> and a relay to replace the pot and switch.  I would appreciate any
>>> suggestions as I

Re: [Emc-users] WG: Re: WG: Re: axis and batch processing

2009-10-11 Thread Andy Pugh

2009/9/30 Chris Epicier :

> Thank you very much for the quick reply. Stephen had
> pointed me to this also, I have amended the files
> accordingly and still get "Bad Number Format".

I was fiddling around with this last night, and got it working for my
application.
I suspect that the reason you didn't see any improvement when you
modified the sub-program files is that Axis doesn't seem to reload
them when you reload the main file. The only way I have found to make
changes to a subprogram stick is to quit and reload Axis. (I didn't do
exhaustive testing, though, I was just trying to get it to work)

After some discussion on IRC tom3p came up with this Wiki article:
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?SubProgamFiles
(Unfortunately there is a typo in the page title which might make it
hard to find)

-- 
atp

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control

2009-10-11 Thread Andy Pugh

2009/10/11 Hubert Bahr :
> The X3 sold by Harbor Freight and also Grizzley (G0463)  use a
> speed potentiometer.  My first attempt will be to use the VFD outputs of
> the Gecko G540 which provides an opto isolated pwm to analog reference.
> In its case it is limited to 12 volts

Can I just mention again that it might be worth finding the
manufacturers data sheet for the drive and seeing what they say?
I managed to break some components around the potentiometer by trying
a simplistic "replace the pot with a voltage" approach.
It was only while trawling the net for a replacement drive that I
found the instructions to apply the control voltage between motor
negative and the pot wiper terminal (both of which had extra lugs on
the board) and when I tried that I found I still had a working drive
in external control mode.

The manual stressed quite strongly that the variable voltage must be
from a floating supply, not referenced to machine or PC ground. If the
Gecko  VFD drive voltage is not floating at both ends and your drive
is similar to mine, then there is a fair chance of breaking both the
drive and the Gecko.

-- 
atp

--
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay 
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] Spindle Control