Real time auto focus tracking system for CO2 laser

Tech_Marco
Posts: 4311
Joined: Mon Jun 15, 2009 3:00 pm

Real time auto focus tracking system for CO2 laser

Postby Tech_Marco » Sun Nov 05, 2017 9:51 am

Hey folks

We are designing a real time tracking system similar to this:
https://m.youtube.com/watch?v=dl0hAMrBnso

We should be able to launch first system in two months if things gone smoothly. Let’s double finger it
48552021-3CCA-4D70-B1FC-A7A67639B019.jpeg


Marco

SWMS
Posts: 139
Joined: Mon Jan 06, 2014 4:28 am

Re: Real time auto focus tracking system for CO2 laser

Postby SWMS » Mon Nov 06, 2017 12:09 am

That looks heavy!

Would you need a larger motor on the x axis? I suppose if you are going for autofocus you may as well have closed loop hybrids.

Tech_Marco
Posts: 4311
Joined: Mon Jun 15, 2009 3:00 pm

Re: Real time auto focus tracking system for CO2 laser

Postby Tech_Marco » Mon Nov 06, 2017 10:11 am

Regular stepping motor is ok. Remember that is is designed for cutting but not for engraving so the X traveling speed is hardly go over 50mm/s. But one may want to upgrade the X motor for another size bigger or like you said get the closed loop stepper should get better performance. I need to test it when prototype is received. I know it works great on 50mm/s but I haven’t tried it over 100mm/s which seems is the limit. Few more weeks later and I should have the system for testing

Stay tuned

Marco

SWMS
Posts: 139
Joined: Mon Jan 06, 2014 4:28 am

Re: Real time auto focus tracking system for CO2 laser

Postby SWMS » Mon Nov 06, 2017 1:39 pm

So the system works independently of the DSP and it’s only the focus lense tht moves up and down?

Tech_Marco
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Joined: Mon Jun 15, 2009 3:00 pm

Re: Real time auto focus tracking system for CO2 laser

Postby Tech_Marco » Mon Nov 06, 2017 1:48 pm

Yes, isn’t it cool

M

SWMS
Posts: 139
Joined: Mon Jan 06, 2014 4:28 am

Re: Real time auto focus tracking system for CO2 laser

Postby SWMS » Thu Nov 09, 2017 9:33 pm

So to calibrate the focus lens you’d have to put the head at the limit of its extension so that when at its shortest extension it stays focused?

I assume it works by bouncing a IR beam off the surface of the material that then returns a voltage and that tells you how far away it is. So then you have a circuit board that once you set a calibrate button it moves down if the voltage starts dropping and up if the voltage rises?

Tech_Marco
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Joined: Mon Jun 15, 2009 3:00 pm

Re: Real time auto focus tracking system for CO2 laser

Postby Tech_Marco » Mon Nov 13, 2017 10:34 am

Yes, it used a laser distance measurement device to calculate the distance through a DA converter. Then, we have to use A/D converter to convert the analog voltage back to the controller and make adjustment on the laser head. I haven't though much about the initiation yet till the prototype arrived. May be you can help smile ?

The first module only take dia.20mm, f:63.5 lens. The next version will be one with swap-able focus lens, possible 50.8mm and/or 68.5mm.

We're also working on another auto focus laser head (not real time) with a limit switch installed so that it can do focus point adjustment through a 'Z' table. There is no need to have any distance measurement devices or circuit required but relying on the laser controller board whether is it supporting 'auto focus' or not.

Marco

SWMS
Posts: 139
Joined: Mon Jan 06, 2014 4:28 am

Re: Real time auto focus tracking system for CO2 laser

Postby SWMS » Mon Nov 13, 2017 7:27 pm

I’ll help if you send me a free prototype to test :lol: hah.

So the second one is a laser head with integrated autofocus rather than these bolted in proximity switches. ?

Tech_Marco
Posts: 4311
Joined: Mon Jun 15, 2009 3:00 pm

Re: Real time auto focus tracking system for CO2 laser

Postby Tech_Marco » Wed Dec 13, 2017 12:49 pm

Two different auto focusing is coming through DHL. I should have that received by tomorrow
We're working on the controller board for the real time tracking system. For the other one, no circuit board need. There is a micro sensor switch installed on the laser head (barrel) and no sensor probe required. I'll post the images when I received it

Marco


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