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

[Bari]

Like the cheap USB webcams and microscopes they perform processing on 
the images before they pipe the data out the ports.


The ones you link to below may be made to work for location and 
measuring.  If you don't mind pausing to make measurements or detecting 
the edges. It will just be more difficult to use them while moving them 
across the parts.


On 3/14/21 12:35 AM, Frank Tkalcevic wrote:

There are a lot of "inexpensive" microscopes that are used for PCB repair and 
inspection like this one...

https://www.aliexpress.com/item/4000835475910.html

And more expensive auto-focus options...

https://www.aliexpress.com/item/4000835289877.html

There are many combinations of lens and camera.  Some USB only.  Some cameras 
have measuring software built in (used via a monitor).

Has anyone tried these for CNC location and measuring?


-Original Message-
From: Bari [mailto:bari00...@gmail.com]
Sent: Saturday, 13 March 2021 7:39 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Nice camera/probe integration

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

[Frank Tkalcevic]

There are a lot of "inexpensive" microscopes that are used for PCB repair and 
inspection like this one...

https://www.aliexpress.com/item/4000835475910.html

And more expensive auto-focus options...

https://www.aliexpress.com/item/4000835289877.html

There are many combinations of lens and camera.  Some USB only.  Some cameras 
have measuring software built in (used via a monitor).

Has anyone tried these for CNC location and measuring?


-Original Message-
From: Bari [mailto:bari00...@gmail.com] 
Sent: Saturday, 13 March 2021 7:39 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Nice camera/probe integration

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

[Karl Schmidt]

It isn't hard to get 'A' picture with a USB microscope from China - but the problem is getting one that is easily in 
focus - the depth of field is very shallow..  Getting things lit in a way to see your 'feature' is another problem.


I have a dark-feild/bright-field microscope with a trinocular camera tube - and it still isn't always easy to get a 
great picture of some metal detail.. the special lighting matters - really helps if the object is flat.


Mechanical touching might be quicker in a lot of cases..  I saw a camera set-up on a lathe where it was focused on the 
tool - so always in focus.


,.,.
I have an idea for a touch probe that makes the tool-and machine all part of an inductor core (a toroid with a gap) - 
the space between the tool and the part is the air gap - the wire coil can be around the colum of the machine (out of 
the way) - the inductance of this coil will change with the air gap - and as you touch, the inductance suddenly changes. 
 They use such air gaps in power conversion - but here it would just be sensed.


I expect that someone has thought of this before and they don't use it due to 
some reason I haven't thought of.
,.,.

Gelbart has a LASER jig that can get you close (30-50um)..
https://youtu.be/otSjut1iGGk?t=140

he talked about another one with a rotating wireless camera - sub-micron..

I knew of him when he was involved in making MODEMs suddenly much faster..

--

Karl Schmidt  EMail k...@lrak.net
3209 West 9th Street Ph (785) 979-8397
Lawrence, KS 66049



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

[Sam Sokolik]

Getting closer... I have to drill a bunch of holes in the face plate...
also have to preload the wheel bearing (grind a bit from the center)

http://electronicsam.com/images/greenmachine/IMG_20210313_201227.jpg

On Fri, Mar 12, 2021 at 10:41 AM Gene Heskett  wrote:

> 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] new, strange problem with cura with 3d45 patches.

[Gene Heskett]

On Saturday 13 March 2021 18:14:57 Gene Heskett wrote:

> The ejector is no longer being driven by cura output!
>
> Something had deleted at least the ejector data, so I unpacked the
> patch again, named CuraDremelSupport-main.zip, DDG for it, and
> recopied the resources tree into
> /home/gene/.cache/4.8./definitions/4.8.0/.
>
> And now it looks like it has extruder data again.
>
> I am going to chattr -i the whole tree.

And did.

> Cheers, Gene Heskett

I believe I found the real problem. Marlin, the gcode interpreter in the 
printer, does NOT understand the "use relative extrusion" command, I 
changed cura back to absolute which due to the bigger E numbers made the 
gcode 100k bigger, but its working. Sorta, It wasn't sticking to the 
matterhackers glass glue, not near as well as the purple stick kiddy 
glue, but that stuff builds up on the glass if you don't pull the plate 
and clean it off with hot water about every other print.

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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[Emc-users] Probe recommendations.

[andrew beck]

Hey everyone

Does anyone know if verser probes are still shipping and making probes?

https://vers.by/en/touch-probes/9-vers-pr.html

I know the owner is a fellow Linuxcnc guy so keen to support him plus there
probes look awesome.

Maybe my emails are bouncing.  But just wondering if anyone knows what they
are up to currently.

And if anyone has used their probes.

And finally.  Any other good probe brands to try that are good value for
money.  And accurate.

I started to get into the new qtpyvcp screens which is why I'm looking at
auto probing now.
Regards

Andrew

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[Emc-users] new, strange problem with cura with 3d45 patches.

[Gene Heskett]

The ejector is no longer being driven by cura output!

Something had deleted at least the ejector data, so I unpacked the patch 
again, named CuraDremelSupport-main.zip, DDG for it, and recopied the 
resources tree into /home/gene/.cache/4.8./definitions/4.8.0/.

And now it looks like it has extruder data again.

I am going to chattr -i the whole tree.

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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