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Real time auto focus tracking system for CO2 laser

Posted: Sun Nov 05, 2017 9:51 am
by Tech_Marco
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

Re: Real time auto focus tracking system for CO2 laser

Posted: Mon Nov 06, 2017 12:09 am
by SWMS
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.

Re: Real time auto focus tracking system for CO2 laser

Posted: Mon Nov 06, 2017 10:11 am
by Tech_Marco
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

Re: Real time auto focus tracking system for CO2 laser

Posted: Mon Nov 06, 2017 1:39 pm
by SWMS
So the system works independently of the DSP and it’s only the focus lense tht moves up and down?

Re: Real time auto focus tracking system for CO2 laser

Posted: Mon Nov 06, 2017 1:48 pm
by Tech_Marco
Yes, isn’t it cool

M

Re: Real time auto focus tracking system for CO2 laser

Posted: Thu Nov 09, 2017 9:33 pm
by SWMS
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?

Re: Real time auto focus tracking system for CO2 laser

Posted: Mon Nov 13, 2017 10:34 am
by Tech_Marco
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

Re: Real time auto focus tracking system for CO2 laser

Posted: Mon Nov 13, 2017 7:27 pm
by SWMS
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. ?