Re: [Emc-users] Nice camera/probe integration

2021-03-12 Thread Bari 
The problem with the cheap webcams is all the frame averaging they 
automatically do. I regularly see decent machine vision camera bodies on 
ebay for ~$100 that won't have this issue. A decent lens is about the 
same used.


These pics were all taken with a cheap USB microscope ($50)  that was 
near useless when there was any motion:


https://imgur.com/2B3j01S

https://imgur.com/QU0ka4r

https://imgur.com/IFdlrj3

https://imgur.com/XKRdpFK

This was of a 50um gap between some caliper jaws. Sobel edge detect filter.

On 3/12/21 1:40 PM, Ralph Stirling wrote:

I had in mind emulating the concept with Linuxcnc
and low-budget cameras and probes, not forking over
for the German luxury model.  I see on eBay cheap
part locating cameras, like this:

https://www.ebay.com/itm/254714062831

and relatively cheap probes like this:

https://www.ebay.com/itm/333094733077

A swing arm like that Datron uses could be controlled
with a beefy RC servo (swung against a mechanical
stop for accuracy), and some python scripts could
do the UI for picking the probing locations as the Datron
video shows.





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Re: [Emc-users] Nice camera/probe integration

2021-03-12 Thread Ralph Stirling 
I had in mind emulating the concept with Linuxcnc
and low-budget cameras and probes, not forking over
for the German luxury model.  I see on eBay cheap
part locating cameras, like this:

https://www.ebay.com/itm/254714062831

and relatively cheap probes like this:

https://www.ebay.com/itm/333094733077

A swing arm like that Datron uses could be controlled
with a beefy RC servo (swung against a mechanical
stop for accuracy), and some python scripts could
do the UI for picking the probing locations as the Datron
video shows.

-- Ralph

From: dave engvall [dengv...@charter.net]
Sent: Friday, March 12, 2021 11:21 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Nice camera/probe integration

CAUTION: This email originated from outside the Walla Walla University email 
system.


I rather hate to think of the cost ... beautiful stuff ... German made.
It is easy to make a probe; good software to extract the real value of
the probe, not so easy.

Dave

On 3/12/21 9:14 AM, Ralph Stirling wrote:
> This would be an awesome setup for Linuxcnc.
>
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.datron.com%2Frevolutionize-workpiece-setup%2F&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cd5ca6f1fe69d4ba9c07208d8e58c1f48%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637511737284546998%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=mFHJDDd2VQ4vpvpkSPVPDL2aCowjBegEl10TgwCO81w%3D&reserved=0
>
> -- Ralph
>
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Re: [Emc-users] Nice camera/probe integration

2021-03-12 Thread Jon Elson 

On 03/12/2021 11:14 AM, Ralph Stirling wrote:

This would be an awesome setup for Linuxcnc.

https://www.datron.com/revolutionize-workpiece-setup/


I got a "USB microscope" and built it into a tool holder and 
hooked it up with camview to show
in a window of LinuxCNC.  It worked, but I really wasn't 
happy with the result.  The camera did some kind of really 
horrible interpolation, so the expanded image was not very 
sharp.  I couldn't tell which edge was the real edge of the 
material if it had been deburred.


See   http://pico-systems.com/centcam.html  for some 
pictures, etc.


So, I lucked into a deal on a Blum 3-axis touch probe.  I 
had to build an IR interface to it.
I wrote a bunch of programs to pick up corners of parts and 
set the coordinate system.

It works much better, but, yes, the probe tip is fragile.

Jon


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Re: [Emc-users] Nice camera/probe integration

2021-03-12 Thread dave engvall 

I rather hate to think of the cost ... beautiful stuff ... German made.
It is easy to make a probe; good software to extract the real value of 
the probe, not so easy.


Dave

On 3/12/21 9:14 AM, Ralph Stirling wrote:

This would be an awesome setup for Linuxcnc.

https://www.datron.com/revolutionize-workpiece-setup/

-- Ralph

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[Emc-users] Nice camera/probe integration

2021-03-12 Thread Ralph Stirling 
This would be an awesome setup for Linuxcnc.

https://www.datron.com/revolutionize-workpiece-setup/

-- Ralph

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Re: [Emc-users] Maybe a minimally printed harmonic drive?

2021-03-12 Thread Gene Heskett 
On Wednesday 10 March 2021 12:58:08 John Dammeyer wrote:

> Hi Sam,
> I found by making the wall thickness bigger along with the hole
> smaller and hub larger I was able to mount the hub on the lathe and
> bore both the bore and the outer part of the hub on the lathe to make
> them symmetrical.  That reduced a lot of wobble compared to earlier
> versions.
>
> In hindsight I would also have made some sort of holder that allowed
> me to skim the inside of the actually pulley part.  Instead I used
> sandpaper because as you can see it has the same roughness from the 3D
> printer as your toothed belt section has.
>
> The hub was a smooth press fit (by hand) in and out of the pulley
> part.  The photo showing it mounted still has the yellow pulley that
> had too small of a hub and the pressure from the set screw cracked it.
>  So the new green one has a wider set screw area.
>
> I suspect the biggest issue with your flex pulley would be holding it
> stable enough so you could skim away material.  Might even be best to
> print it with a flat face to hold it round.  Then mount it in a
> holder, skim the inside surface and then cut through the face at the
> back.  The flat face could even have mounting holes to mount onto the
> back of your plate.  This would keep it from turning in the mount
> while you skim it.
>
I've got a better idea, since LCNC can do a taper, taper the holder 2 
thou, drive it all the way in so its gripped good, bore it to half that 
taper, pull it out, turn the other face and repeat w/o touching the x 
dial. Just make sure all the burrs on the teeth from the printer are 
well cleaned off with a fresh blade in a box knife. Burrs will show as 
wibbles in the bore if you dont. :(

> John
>
> > From: Sam Sokolik [mailto:samco...@gmail.com]
> >
> > another update - at 1/2 step - the discrete resolution should be
> > about 40,000 divisions per rotation.  .009 deg.
> >
> > https://www.youtube.com/watch?v=IdfKre6zpEY
> >
> > On Thu, Feb 4, 2021 at 4:00 PM Sam Sokolik  
wrote:
> > > https://www.youtube.com/watch?v=ZVVffljc7kE


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] Maybe a minimally printed harmonic drive?

2021-03-12 Thread Gene Heskett 
On Wednesday 10 March 2021 12:58:08 John Dammeyer wrote:

> Hi Sam,
> I found by making the wall thickness bigger along with the hole
> smaller and hub larger I was able to mount the hub on the lathe and
> bore both the bore and the outer part of the hub on the lathe to make
> them symmetrical.  That reduced a lot of wobble compared to earlier
> versions.
>
> In hindsight I would also have made some sort of holder that allowed
> me to skim the inside of the actually pulley part.  Instead I used
> sandpaper because as you can see it has the same roughness from the 3D
> printer as your toothed belt section has.
>
> The hub was a smooth press fit (by hand) in and out of the pulley
> part.  The photo showing it mounted still has the yellow pulley that
> had too small of a hub and the pressure from the set screw cracked it.
>  So the new green one has a wider set screw area.
>
> I suspect the biggest issue with your flex pulley would be holding it
> stable enough so you could skim away material.  Might even be best to
> print it with a flat face to hold it round.  Then mount it in a
> holder, skim the inside surface and then cut through the face at the
> back.  The flat face could even have mounting holes to mount onto the
> back of your plate.  This would keep it from turning in the mount
> while you skim it.
>
> John
>
Hi you two;

I've manage to beat openscad into enough submission to make the loose 
belt, approx 99mm at pitch diameter. With 60 "teeth" which are actually 
from equalateral triangles.  Now I've turned the triangles 180 degree so 
they face inward and increased the pitch radius to 54.5, and now making 
a 62 tooth outer ring for fit testing. But it occurs to me since I need 
a lessor gear ratio than 30/1, that I might be able to cheat a bit on 
the output ring, and get half the gear ratio and twice the speed if I 
made the the output ring with 58 teeth. I'm obviusly way behind you two, 
but before I waste a $30 roll of PETG, I thought I'd throw it out there 
for target practice by more experienced people.

Discuss? Tell me I'm out of my mind, your choice. :)



> > From: Sam Sokolik [mailto:samco...@gmail.com]
> >
> > another update - at 1/2 step - the discrete resolution should be
> > about 40,000 divisions per rotation.  .009 deg.
> >
> > https://www.youtube.com/watch?v=IdfKre6zpEY
> >
> > On Thu, Feb 4, 2021 at 4:00 PM Sam Sokolik  
wrote:
> > > https://www.youtube.com/watch?v=ZVVffljc7kE


Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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