Focus Gauge for Epilog Laser Cutter with 4" Lens

An alternative focus gauge for the Epilog Helix laser cutter. Should fit other models (Mini, Helix, Legend).
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updated September 1, 2023

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I recently needed to cut some thick polyurethane foam with my Epilog Helix laser cutter. 

I purchased an inexpensive 4" focal length lens to increase the working distance and depth of cut. The stock focus gauge only works with the original 2" lens, so I designed an alternative focus gauge for the 4" lens.

I designed this 4" focus gauge to mimic the original Epilog focus gauge. Two 2-56 hex nuts are pressed into the gauge so that it will stick to the existing magnets in the Epilog carriage.

There is a simple ruler printed on the gauge that helps you to put the focal plane at the center of thick materials. I have found that this works much better than focusing at the top of the material.

 

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