Hello,
Does anyone know a proven method to reset the focus after cleaning the lens. My method is trial and error and it can take me a few hours to perfect.
Thanks
You should conduct a “Ramp Test”. Once you know the proper focus height you should cut out a piece of material that fits that focus that you need. That way you can slide it under the head and tighten manually. (I’m assuming you have a diode laser?) even with a CO2 this would work
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The lens is the last in the chain, mirror 1, then mirror 2, then mirror 3 and finally your lens. So after cleaning the lens there shouldn’t be much in the way of adjustments to do.
What I would recommend is cutting yourself a Beam Checker from 3mm Acrylic, stick some masking tape over the 5-holes and use it over your nozzle, test pulse on low power and check that you beam is centred.
Beam Checker.lbrn (12.3 KB)
I think he’s got an LED. Don’t know if that will fit. It sure won’t on mine.
Oh yeah, of course, beam checker it not going to help with that 
This will work with either laser. It’s about finding the focal point.
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Great video, thanks! I’ll definitely be using this method and making a guid tool.
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Thanks JMichael, My diode is 450Nm and with variable focus. do you have lengths for that? Also, do you have a length for the adjustable part? Sorry, my terminology is not good today. I was able to cut a piece of 1/4" Birch ply in 8 passes, but not anymore.
Thanks
Thank you LaserWillie, this is a really good video. Is it the same for the adjustable type diode? I can set the height for the diode, but I’m lost when I need to fine tune the adjustable lens.
Thanks
Yes it is the same. You just find the appropriate distance and make a guide for that distance.
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Thanks my friend.
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thanks again, I’m backed up with jobs right now, but as soon as I can, I’m going to build one.
So you stated 405 Nm variable focus Diode is 56mm, is it the same for a 450Nm also?
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