Re: [Emc-users] Rapid Prototype for CNC mill

[Jeshua Lacock]

On Jul 25, 2012, at 6:19 PM, Ed Nisley wrote:

>> All those patent that you refer are too old and antiquated.
> 
> The earliest 3D printing patents are, indeed, beginning to expire, so I
> expect to see a bunch of interesting developments in the DIY field.

Hi Ed,

I am just curious, like what for instance?


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[Kent A. Reed]

On 7/25/2012 10:50 PM, John Stewart wrote:
> Kent;
>
> It looks like I was wrong, but (if I'm correct this time!) running linuxcnc + 
> the RTAI stuff in core1 on my little D525MW seems to do the job quite well.
>
> It's been running a program for a couple of hours right now, and no issues.
>
> Q: Why, if there was "nothing" other than RTAI running on cpu1, did I get 
> real time errors, but adding linuxcnc to cpu1 made it run better? Where, 
> really, is the timing issue?
>
> Thank all of you for the replies and support and guidance.
>
> John Stewart.
>
>

I suspect the path to a satisfying answer lies in understanding the 
bottom of the page in http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RealTime 
which mentions the improvement in latency results obtained when running 
a "cpu hog" to prevent flushing RT code out of the cache. This is beyond 
the scope of my wiki entry, which addressed the narrow point of moving 
from classic Grub to Grub2.

Honestly, though, I haven't thought about multi-core issues since I 
wrote my wiki entry 14 months ago, and I've already forgotten half of 
what I learned in the process. (Which makes me wonder why I'm trying to 
understand the issue of USB badness now. How long will it take me to 
forget whatever I might learn?)

Regards,
Kent





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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[John Stewart]

Kent;

It looks like I was wrong, but (if I'm correct this time!) running linuxcnc + 
the RTAI stuff in core1 on my little D525MW seems to do the job quite well.

It's been running a program for a couple of hours right now, and no issues.

Q: Why, if there was "nothing" other than RTAI running on cpu1, did I get real 
time errors, but adding linuxcnc to cpu1 made it run better? Where, really, is 
the timing issue?

Thank all of you for the replies and support and guidance.

John Stewart.


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Re: [Emc-users] Rapid Prototype for CNC mill

[a]

On 2012-07-25 18:19, Ed Nisley wrote:
> On Wed, 2012-07-25 at 11:14 -0600, a...@conceptmachinery.com wrote:
>> Patent in US has only 15 years life.
>
> That is, unfortunately, incorrect, but the right answer isn't easy to
> figure out:
>
> http://www.patentlens.net/daisy/patentlens/2973.html
>
>> All those patent that you refer are too old and antiquated.
Hi
few things about patent. Main recommendation is to try to manufacture 
products first and after think about patent. Only 1% from all patents 
actually produced and sold and returned any profit.
Next, "derivative patents" does not stop any one to used the old 
patents.
derivative patents - usually do not add any much useful volume to old 
patent.
About  "patent trail" -- use core of old patent and you will be ok.
patent trail  -only open when one can see how to collect money. can you 
collect money from small shop?
One can patent only novel idea and not simple design.


> The earliest 3D printing patents are, indeed, beginning to expire, so 
> I
> expect to see a bunch of interesting developments in the DIY field.
>
> However, the fact that older patents expire does not mean that the
> companies haven't been busy filing derivative patents with similar
> claims. Following the patent trail up to the present time can provide
> hours of mingled admiration and horror ... [grin]
>
> --
> Ed
> http://softsolder.com
>
>
>
> 
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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[Kent A. Reed]

On 7/25/2012 5:47 PM, John Stewart wrote:
> Me again;
>
> Ok - top (with key press "1") shows 2 cpus, one idle ALL the time.
>
> With the LinuxCNC 2.5 "release-version", downloaded about a month ago,  The 
> "taskset" is not getting called as it should be.
>
> So, LinuxCNC runs on CPU0, along with everything else.
>
> Now to find out where that taskset should be getting called from. At least I 
> can turn on ethernet on my linuxcnc computer, because the issue is getting 
> close to being resolved.
>
> This stuff should be put in the "Troubleshooting" document - following Kent's 
> instructions (as great as they are) does not get one to the solution.
>
>
> Thanks;
>
> John Stewart.
>
John,

I'm not sure yet what all "this stuff" is, but certainly I intended my 
contribution to the wiki to be amended as needed.

The fact that the realtime kernel runs beyond (or below, if you like) 
the ken of the Linux kernel and all its useful tools like top and htop 
must be taken into account.

Good luck.

Regards,
Kent


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Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

[Kent A. Reed]

On 7/25/2012 2:44 PM, andy pugh wrote:
> http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
> Looks like a nice 0.07" centre-height lathe.
>
> The full set is at :
> http://www.modvid.com.au/html/body_anders_bike_shop_details.html

The meticulousness of this model surpasses any diorama I've seen at any 
scale. I found myself responding emotionally to it. There was a sense of 
"wait, haven't I been in this shop?" Curiously, I spent part of a trip 
to Ohio last month trying to find a similar shop, in existence 45 years 
ago, where I bought my last motorcycle, a Norton Atlas. I found just a 
vacant cinder-block building in complete disrepair with no evidence of 
its past---no decals in windows, no RidgidTool calendars on walls, no 
parts in the bin. Sic transit gloria mundi.

As for the lathe, my experience with full-sized lathes began and ended 
with South Bends and Hardinges. Not a clue.


Thanks for the pointer.

Regards,
Kent


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

[Dave Keeton]

On Sat, 2012-07-21 at 18:22 -0500, Jon Elson wrote:
> 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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Jon,
   Thanks for looking into this but I have it working now. By the
way, The Axiom card is a Digital I/O card supported by HAL. I was kind
of surprised that everyone assumed that it was a video card. The card is
the Axiom AX5214H as described in the Linux CNC Docs. The problem was
caused by an ATI Video driver that was not removed when I pulled the old
video card out a while back.(Long before the DIO card was installed)
Don't know why it caused a problem after the DIO card was installed but
removing the old video driver corrected the problem.

Thanks again,
   Dave



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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[Gene Heskett]

On Wednesday 25 July 2012 21:09:02 John Stewart did opine:

> Me again;
> 
> Ok - top (with key press "1") shows 2 cpus, one idle ALL the time.
> 
> With the LinuxCNC 2.5 "release-version", downloaded about a month ago, 
> The "taskset" is not getting called as it should be.
> 
> So, LinuxCNC runs on CPU0, along with everything else.
> 
> Now to find out where that taskset should be getting called from. At
> least I can turn on ethernet on my linuxcnc computer, because the issue
> is getting close to being resolved.
> 
> This stuff should be put in the "Troubleshooting" document - following
> Kent's instructions (as great as they are) does not get one to the
> solution.
> 
> 
> Thanks;
> 
> John Stewart.

Sounds like you have it John.  As a side note, rtai looks for that idle cpu 
and uses it for all the realtime stuff.  But because of the isolcpus, it is 
so isolated that top, htop, gkrellm etc, cannot access it to see how busy 
it is so it always _looks_ idle.  But it isn't idle when linuxcnc is 
running.


> 
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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!
It is the quality rather than the quantity that matters.
-- Lucius Annaeus Seneca (4 B.C. - A.D. 65)

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Re: [Emc-users] Rapid Prototype for CNC mill

[Ed Nisley]

On Wed, 2012-07-25 at 11:14 -0600, a...@conceptmachinery.com wrote:
> Patent in US has only 15 years life.

That is, unfortunately, incorrect, but the right answer isn't easy to
figure out:

http://www.patentlens.net/daisy/patentlens/2973.html

> All those patent that you refer are too old and antiquated.

The earliest 3D printing patents are, indeed, beginning to expire, so I
expect to see a bunch of interesting developments in the DIY field.

However, the fact that older patents expire does not mean that the
companies haven't been busy filing derivative patents with similar
claims. Following the patent trail up to the present time can provide
hours of mingled admiration and horror ... [grin]

-- 
Ed
http://softsolder.com



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Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

[Terry Christophersen]

I have been just staring at these pics all this time.
The 30s machine shop is pretty neat too.

T
 
- Original Message -
From: andy pugh 
To: Terry Christophersen ; Enhanced Machine Controller 
(EMC) 
Cc: 
Sent: Wednesday, July 25, 2012 6:43 PM
Subject: Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

On 26 July 2012 00:35, Terry Christophersen  wrote:

> I mean a scale impact wrench!...That looks used!

I think my favourite detail is that one window pane has unpainted
putty, presumably because it has been replaced since the frames were
last painted.

-- 
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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] [OT] I wonder what lathe this is modelled on?

[andy pugh]

On 26 July 2012 00:35, Terry Christophersen  wrote:

> I mean a scale impact wrench!...That looks used!

I think my favourite detail is that one window pane has unpainted
putty, presumably because it has been replaced since the frames were
last painted.

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

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Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

[Terry Christophersen]

I dont know what to say here,I am in awe of these models. I have built
scale RC planes and have a pretty good sized model railroad,but this 
persons weathering and aging of things is outstanding.
He must be single as no wife I know would allow the time for this.
I mean a scale impact wrench!...That looks used!
The barrels outside look like they actually are rusty.
I will stop now.Thanks for the link

Terry

- Original Message -
From: mark center 
To: Enhanced Machine Controller (EMC) 
Cc: 
Sent: Wednesday, July 25, 2012 6:07 PM
Subject: Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

My guess would be a Colchester, fine old British iron. I have a
Monarch 18-CBB that looks similar without a tray top.

http://bbs.homeshopmachinist.net/threads/40292-Identify-this-Colchester-Lathe

On Wed, Jul 25, 2012 at 3:09 PM, Gene Heskett  wrote:
> On Wednesday 25 July 2012 15:53:49 andy pugh did opine:
>
>> http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
>> Looks like a nice 0.07" centre-height lathe.
>>
>> The full set is at :
>> http://www.modvid.com.au/html/body_anders_bike_shop_details.html
>
> All I can say is WOW!  The detail is great.  I'll have to admit that
> amongst all the old Triumphs & Harley's & Beemer's, I half expected to see
> a prewar Indian Chief with its 4 cylinder inline engine, and possibly even
> an Ariel Square 4.  But even in our world of today, Jay Leno probably owns
> 50% of the survivors in 2012.  Very few left IOW.  I rode a borrowed Chief
> in a veterans day parade once, with a square 4 in front of me.  I have
> never again seen both in the same year.  The Chief had a suicide clutch and
> was hell to control at sub idling speeds, but was also very quiet.  You
> could hear the Ariels mechanical noises a block away.  I was a bit green at
> biking then, back in the middle 50's, and didn't realize till 25 years
> later that that ride could and should have been in the history books, but
> it was just part of the glitz for a veterans day parade then.
>
> 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!
> ... I want to perform cranial activities with Tuesday Weld!!
>
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Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

[andy pugh]

On 26 July 2012 00:07, mark center  wrote:
> My guess would be a Colchester, fine old British iron. I have a
> Monarch 18-CBB that looks similar without a tray top.

No, definitely not a Colchester, and probably not British at all, as
they tended to put the feed handle at the back (so Z was right-hand,
and X was left hand).
Unlike the US practice of putting your left hand under the flow of hot
swarf controlling Z.

I use a Colchester Student as shown in that picture rather regularly,
it's an extremely nice bit of kit. In fact every time I use it I am
reminded what a hateful pile of scrap I invested a ton of money into
CNC converting…

I have had a quick look through a few guesses at www.lathes.co.uk, but
not found any good candidates yet.

-- 
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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] [OT] I wonder what lathe this is modelled on?

[mark center]

My guess would be a Colchester, fine old British iron. I have a
Monarch 18-CBB that looks similar without a tray top.

http://bbs.homeshopmachinist.net/threads/40292-Identify-this-Colchester-Lathe

On Wed, Jul 25, 2012 at 3:09 PM, Gene Heskett  wrote:
> On Wednesday 25 July 2012 15:53:49 andy pugh did opine:
>
>> http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
>> Looks like a nice 0.07" centre-height lathe.
>>
>> The full set is at :
>> http://www.modvid.com.au/html/body_anders_bike_shop_details.html
>
> All I can say is WOW!  The detail is great.  I'll have to admit that
> amongst all the old Triumphs & Harley's & Beemer's, I half expected to see
> a prewar Indian Chief with its 4 cylinder inline engine, and possibly even
> an Ariel Square 4.  But even in our world of today, Jay Leno probably owns
> 50% of the survivors in 2012.  Very few left IOW.  I rode a borrowed Chief
> in a veterans day parade once, with a square 4 in front of me.  I have
> never again seen both in the same year.  The Chief had a suicide clutch and
> was hell to control at sub idling speeds, but was also very quiet.  You
> could hear the Ariels mechanical noises a block away.  I was a bit green at
> biking then, back in the middle 50's, and didn't realize till 25 years
> later that that ride could and should have been in the history books, but
> it was just part of the glitz for a veterans day parade then.
>
> 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!
> ... I want to perform cranial activities with Tuesday Weld!!
>
> --
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> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[John Stewart]

Andy;

>> 2) taskset 0x0002 linuxcnc
> 
> Shouldn't that be rtai?

Ah - I now understand what your thinking is.

I really don't know - but your comment makes sense - I was throwing the whole 
of linuxcnc over to cpu1, not just the rtai section.

Right now my little KX1 is running a test with a BASE_THREAD of 25000; before 
it was 30379 and it would throw out the Real Time error within a few minutes. 

Only knowing about the taskset command for the last few hours, and not knowing 
how linuxcnc does things, I'm learning as we go along.

We'll see how this BASE_THREAD of 25000 test goes - even if the whole of 
LinuxCNC is on one cpu, as long as it seems to work without croaking, maybe 
that's all that is needed for my config.


JohnS.
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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[andy pugh]

On 25 July 2012 23:15, John Stewart  wrote:

> 2) taskset 0x0002 linuxcnc

Shouldn't that be rtai? Doesn't linuxcnc include all the userspace stuff too?
I have never seen anything rtai show up in top (or htop, having just
installed that) and I have been assuming it was running invisibly in
the apparently empty CPU core. I might, of course, be entirely wrong
in this assumption

-- 
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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[John Stewart]

Andy;


>> 
>> Ok - top (with key press "1") shows 2 cpus, one idle ALL the time.

Nope - (being blunt) Remember that that isolcpus is theoretically set properly 
by grub2.


1) start linuxcnc 2.5.0 from command line.
f50mm g1 x0 y0 z0
top shows:
cpu0 64% system 35% idle
cpu1 100% idle.

2) taskset 0x0002 linuxcnc
f50mm g1 x0 y0 z0
top shows:
cpu0 70% user 27% idle.
cpu1 65% system 33% idle

--

I'm going to run some tests tonight with linuxcnc tasksetted to cpu1.

Wonder, though, why cpu0 70% user space processing is happening with taskset 
set? Maybe a tight loop in there waiting for something to happen.

I'll report back tomorrow on how well my machine runs tests using an explicit 
taskset. 


John Stewart.


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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[andy pugh]

On 25 July 2012 22:47, John Stewart  wrote:
> Me again;
>
> Ok - top (with key press "1") shows 2 cpus, one idle ALL the time.

I _think_ that means that RTAPI is running on there, but top can't see it.

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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[John Stewart]

Me again;

Ok - top (with key press "1") shows 2 cpus, one idle ALL the time.  

With the LinuxCNC 2.5 "release-version", downloaded about a month ago,  The 
"taskset" is not getting called as it should be. 

So, LinuxCNC runs on CPU0, along with everything else.

Now to find out where that taskset should be getting called from. At least I 
can turn on ethernet on my linuxcnc computer, because the issue is getting 
close to being resolved.

This stuff should be put in the "Troubleshooting" document - following Kent's 
instructions (as great as they are) does not get one to the solution.


Thanks;

John Stewart.
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Re: [Emc-users] Rapid Prototype for CNC mill

[Jeshua Lacock]

On Jul 25, 2012, at 1:15 AM, a...@conceptmachinery.com wrote:

> Those all was close but not what i ask for.
> I am looking for real - real- rapid prototype. What this means ?
> 1. rapid prototype should have 2 liquid materials-- main material and 
> support material.

Hi Aram,

Actually, the MakerBot Replicator has two print heads as an option. And others 
have added a second head to RepRap, Ultimaker, etc.

It is then possible to print the part with ABS and the support with PLA. PLA 
can then be dissolved while leaving the ABS intact:

http://www.makerbot.com/blog/2010/10/19/pla-proven-as-a-dissolveable-support-material/

Or a slower method is just using hot water:

http://www.bitsfrombytes.com/forum/post/safe-support-material-removal-really-works

An other option is to print the supports with water soluble PVA:

http://wiki.makerbot.com/pva

> 2. rapid prototype must have CNC programmable head - like with EMC2 AC 
> servomotor that open close needle valve that controls amount of plastic 
> that introduced with head.

The MakerBot MK7 head does just that:

http://store.makerbot.com/stepstruder-mk7-complete.html

> 3. rapid prototype must have accuracy around on 0.005" to have real use 
> to make real commercial model prototype. CNC programmable head must be 
> able to change accuracy from 0.001"-0.01"
> by changing M code in CNC program.

I personally don't see this as a major hurdle. Currently print resolution can 
be changed by manually changing out the print nozzle. There is no reason why an 
adjustable print aperture or automated tool changer could not be developed 
though.


Cheers,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated

Phone: 208.462.4171


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Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

[Gene Heskett]

On Wednesday 25 July 2012 15:53:49 andy pugh did opine:

> http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
> Looks like a nice 0.07" centre-height lathe.
> 
> The full set is at :
> http://www.modvid.com.au/html/body_anders_bike_shop_details.html

All I can say is WOW!  The detail is great.  I'll have to admit that 
amongst all the old Triumphs & Harley's & Beemer's, I half expected to see 
a prewar Indian Chief with its 4 cylinder inline engine, and possibly even 
an Ariel Square 4.  But even in our world of today, Jay Leno probably owns 
50% of the survivors in 2012.  Very few left IOW.  I rode a borrowed Chief 
in a veterans day parade once, with a square 4 in front of me.  I have 
never again seen both in the same year.  The Chief had a suicide clutch and 
was hell to control at sub idling speeds, but was also very quiet.  You 
could hear the Ariels mechanical noises a block away.  I was a bit green at 
biking then, back in the middle 50's, and didn't realize till 25 years 
later that that ride could and should have been in the history books, but 
it was just part of the glitz for a veterans day parade then.

Cheers, Gene
-- 
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Re: [Emc-users] [OT] I wonder what lathe this is modelled on?

[Viesturs Lācis]

2012/7/25 andy pugh :
> http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
> Looks like a nice 0.07" centre-height lathe.
>
> The full set is at :
> http://www.modvid.com.au/html/body_anders_bike_shop_details.html

Holly molly, how do they make such a tiny thingies?!
Perfection of all the small details amazes me - chips around lathe,
paint falling off the gas tanks, rust on bikes...

-- 
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[Emc-users] [OT] I wonder what lathe this is modelled on?

[andy pugh]

http://www.modvid.com.au/assets/images/anders_bike_shop03.jpg
Looks like a nice 0.07" centre-height lathe.

The full set is at :
http://www.modvid.com.au/html/body_anders_bike_shop_details.html

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Re: [Emc-users] Rapid Prototype for CNC mill

[a]

> Although I don't have any inside information, I believe the reason 
> DIY
> 3D printers have (or don't have) specific features is that most of 
> the
> original patents remain in effect.

Patent in US has only 15 years life. I have US patent personally on my 
name - not through any company etc.
I can write patent application to US PTO my self and pay only standard 
fee.
In special case -like pharmacy drug patent life can go up to 18 years. 
That is all.

All those patent that you refer are too old and antiquated.
  Every manufacturing company incorporate in there product 2 parts. Part 
1- is what customer need and willing to pay. Part 2 is add things that 
only increase price -costumer does not need that at all - and can not be 
option out.
About " waffle iron " i think that all EMC2 is people that do just 
that. Do thing that other think impossible.



> These seem to be the fundamental patents:
>
> http://softsolder.com/2012/06/29/fundamental-3d-printing-patents/
>
> The patent documents include links to more recent patents that refer
> back to them, so you can devote as much time as you wish to 
> determining
> that the neat idea *you* just had has already been invented, 
> patented,
> and reduced to practice. It worked that way for me, anyhow... [grin]
>
> Although converting a CNC mill to a 3D printer seems attractive, I 
> think
> the second-order effects will make it impractical: speed, 
> cleanliness,
> ambient environment, stuff like that. As one of my managers put it: 
> "You
> must first decide whether you're designing a waffle iron or a 
> toaster."
>
> Which is not to say that you can't do it for yourself. What you 
> almost
> certainly *can't* do is invent a commercially viable 3D printer and 
> sell
> it with impunity...
>
> --
> Ed
> http://softsolder.com
>
>
>
> 
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Re: [Emc-users] Rapid Prototype for CNC mill

[Gene Heskett]

On Wednesday 25 July 2012 12:02:11 Kent A. Reed did opine:

> On 7/25/2012 8:58 AM, Ed Nisley wrote:
> > As one of my managers put it: "You
> > must first decide whether you're designing a waffle iron or a
> > toaster."
> 
> A man wise beyond his years :-)
> 
> We seem more in the Saturday Night Live camp: "New Shimmer is both a
> floor wax *and* a dessert topping."
> 
> Regards,
> Kent
> 
ROTFLMAO!  Thanks Kent, I needed a good chuckle.

Cheers, Gene
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 soap, ballot, jury, and ammo. Please use in that order."
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Re: [Emc-users] xml for G540 and pncconf with 5i25?

[Kirk Wallace]

On Tue, 2012-07-24 at 20:47 -0700, Peter C. Wallace wrote:
... snip
> The latest G540 configuration uses a one output stepgen for the chargepump 
> due to that rather annoying G540 "feature" that the chargepump needs a
> 10 KHz frequency which would force the use of a base thread if the bit was 
> just GPIO (dont know why 500 Hz would not have done, oh well)

I have gotten 1 kHz to work. 
http://wallacecompany.com/machine_shop/G540/g540_siig_1kHz.jpg 
http://wallacecompany.com/machine_shop/G540/ 

It depends on how hard the drive circuit can drive the G540 input. A
buffer chip or transistor that can quickly drive the signal to 5 Volts
and 0 Volts will be able to get more charge into the G540's pump
capacitor and may get the frequency down to 500 Hz.
http://wallacecompany.com/machine_shop/G540/G540_upper_bottom_z-1b.png 

> The chargepump stepgens are at the end numerically so dont interfere with 
> the G540s stepgen assignment (they are stepgen 8 (P3) and 9 (P2))
> 
> 
> There are a couple ways to get a square wave out of the stepgen. One is to 
> set 
> the position scale to 1, set stepgen output mode to quadrature and 
> operating mode to velocity and finally set the velocity to .25 (this is .25 
> instead of 1 because quadrature mode counts 4x as fast at step/dir mode)

I just use a parallel port, buffer and HAL's charge pump component.
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?About_Charge_Pumps 

The G540 also has a pump bypass. See Step 3 here:
http://www.geckodrive.com/g540-initial-setup-guide 


-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
California, USA


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Re: [Emc-users] USB badness, was Re: BASE_PERIOD and Intel D525MW boards

[Kent A. Reed]

On 7/24/2012 9:18 PM, cogoman wrote:
> On 07/24/2012 07:08 AM, Kent A. Reed wrote:
>> Any thoughts?
> From what I've seen looking into USB 2.0 device programming, the
> transfers are too quick for most (maybe all) microcontrollers to keep up
> with in software, so you are generally tied to DMA transfers on the
> microcontroller side.  FTDI has some chips that eliminate the DMA issue
> for the programmer, but they may do DMA internally.
>
> There is a mode called 'isosynchronus' where a peripheral negotiates
> a certain amount of transfer for every time USB transfers data.  This
> mode can be used for more reliable data streams.  I suspect that a high
> bandwidth peripheral that has a USB port all to itself will not be as
> problematic as one that contends with a mouse and keyboard for the port.
>
> I also suspect that the USB connection has a certain period between
> communication events.  A base period that gets lots of real time errors
> from contention with USB*/may/* have much less problems with both faster
> and slower base periods.
>
> Perhaps when documenting what works, and what doesn't, it would make
> sense to keep track of:
>
> 1:USB 1.1 or USB 2.0
> 2:What is the device?
> 3:Does it have the port to itself?
> 4:Is a hub being used?  A hub may complicate the timing.
> 5:The appropriate part of the log files.
>

Thanks, cogoman, and I agree completely. I'd add what is perhaps obvious 
but often overlooked

6:description of the motherboard, right down to the BIOS version
7.the O/S version
8.the total USB environment---what devices, what ports

Be specific to be terrific :-)

Regards,
Kent


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Re: [Emc-users] Rapid Prototype for CNC mill

[Kent A. Reed]

On 7/25/2012 8:58 AM, Ed Nisley wrote:
> As one of my managers put it: "You
> must first decide whether you're designing a waffle iron or a toaster."

A man wise beyond his years :-)

We seem more in the Saturday Night Live camp: "New Shimmer is both a 
floor wax *and* a dessert topping."

Regards,
Kent


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Re: [Emc-users] wish8.5[5112]:segfault at 0 ip(null) sp bfc67b60 error 4 in wish8.5[8048000+1000] Segmentation fault

[Kent A. Reed]

On 7/24/2012 10:10 PM, xgd...@sina.com wrote:
> Dear sir,
>
>   when i excute wish8.5 , it'll show the information  
> "wish8.5[5112]:segfault at 0 ip(null) sp bfc67b60 error 4 in 
> wish8.5[8048000+1000]  Segmentation fault".
>  
>i have installed tk8.5/tcl8.5 in a  Development Machine ,then i copy 
> wish8.5 and the lib it needs to my target machine .
>my target machine is a i486 architecture with the linux kernel is 
> 2.6.32 + rtai3.8 which is the same with my Development Machine .
>   the wish8.5 can be excuted in my development machine ,but to my target 
> machine ,it shows" wish8.5[5112]:segfault at 0 ip(null) sp bfc67b60 error 4 
> in wish8.5[8048000+1000]  Segmentation fault". i don't know the reason.
>  yours
>liangrunhan
>
>

Generally speaking, segfaults occur when your program ("wish" in this 
case) tries to access memory that the CPU cannot access. There may be 
more diagnostic information available in various log files.

At a guess, simply copying "wish8.5 and the lib it needs" is not 
sufficient. Why don't you install tk85/tcl8.5 directly on your target 
machine to make sure references are resolved correctly?

Since this is not a LinuxCNC issue, I suggest you try the wider audience 
of people who live and breathe tcl/tk by making use of 
http://www.tcl.tk/community/


Regards,
Kent




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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[John Stewart]

Andy;

> top always shows one processor unless you press the "1" key.
> 
> Even with Isolcpus top should show 2 processors, but one shold appear
> completely idle.

Thank you. I'll check this tonight.


John Stewart.







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Re: [Emc-users] Rapid Prototype for CNC mill

[Ed Nisley]

On Wed, 2012-07-25 at 01:15 -0600, a...@conceptmachinery.com wrote:
> problem with reprap is that their main idea is to make cheap machine 
> -under $ 1000- but not real rapid prototype machine. 

Although I don't have any inside information, I believe the reason DIY
3D printers have (or don't have) specific features is that most of the
original patents remain in effect.

These seem to be the fundamental patents:

http://softsolder.com/2012/06/29/fundamental-3d-printing-patents/

The patent documents include links to more recent patents that refer
back to them, so you can devote as much time as you wish to determining
that the neat idea *you* just had has already been invented, patented,
and reduced to practice. It worked that way for me, anyhow... [grin]

Although converting a CNC mill to a 3D printer seems attractive, I think
the second-order effects will make it impractical: speed, cleanliness,
ambient environment, stuff like that. As one of my managers put it: "You
must first decide whether you're designing a waffle iron or a toaster."

Which is not to say that you can't do it for yourself. What you almost
certainly *can't* do is invent a commercially viable 3D printer and sell
it with impunity...

-- 
Ed
http://softsolder.com



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Re: [Emc-users] BASE_PERIOD and Intel D525MW boards

[andy pugh]

On 25 July 2012 03:54, John Stewart  wrote:

> Yes - e.g., top shows 1 processor.

top always shows one processor unless you press the "1" key.

Even with Isolcpus top should show 2 processors, but one shold appear
completely idle.

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Re: [Emc-users] Rapid Prototype for CNC mill

[andy pugh]

On 25 July 2012 08:15,   wrote:

> Those all was close but not what i ask for.
> I am looking for real - real- rapid prototype. What this means ?

It probably means a visit from the Stratasys lawyers.

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Re: [Emc-users] Rapid Prototype for CNC mill

[a]

Hi
I did ask about rapid prototype machine and got helpful directions.
I check about reprap technology

Those all was close but not what i ask for.
I am looking for real - real- rapid prototype. What this means ?
1. rapid prototype should have 2 liquid materials-- main material and 
support material.
2. rapid prototype must have CNC programmable head - like with EMC2 AC 
servomotor that open close needle valve that controls amount of plastic 
that introduced with head.
3. rapid prototype must have accuracy around on 0.005" to have real use 
to make real commercial model prototype. CNC programmable head must be 
able to change accuracy from 0.001"-0.01"
by changing M code in CNC program.

EMC2 is good to use for that --by allocating 2 or 3 programmable axis 
only to control head of real rapid prototype machine.

problem with reprap is that their main idea is to make cheap machine 
-under $ 1000- but not real rapid prototype machine.
Real head for rapid prototype machine may cost a lone up to $5000 and 
shop will buy it because with it one can convert any size of CNC mill 
into high performers rapid prototype machine.

thanks
aram

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