CO2 Laser Lens Focal Length Discovery Jig - Parametric
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attach jig to caliper, insert lens, go outdoors around noon and find approx. focal length of lens (spec)
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I created a jig to attach to my caliper and adjust height from a flat surface until i got the spot size as close to focus as I was able, then looked at available lens focal lengths. Then ordered replacement lenses for our autofocus metal cutting CO2 laser. I placed the order with a US based laser sales and service company (lightobject) if anyone else has been looking for one.
common focus length list:
F38.1
F50.8
F63.5
F68.5
F75.0
F100
F127
In Onshape, double-click and change your lens diameter, caliper arm measurements and tolerance of your printer for hole ID if known. My printers seem to give a good fit with a plus 0.2mm and not locking the lens in the jig.
