Laser Engraving Under Glass. Answered
Just put a video on Youtube about Laser Engraving under glass.
A lot of people have made their own Laser Engravers using one method or another.
I did the same using old DVD drive mechanism's a couple of Easydrivers an Arduino UNO and a 2 Watt Laser Diode and a Constant Current Laser Driver with TTL / PWM.
Arduino has GRBL 1.1f loaded on to it and I use LaserGRBL (free program) to do the image settings, generate the GCode and burn the image.
It's a good little machine, although the workpiece size is only 39mm x 39mm max.
Eventually I'll build a bigger machine, but for now it does what I want it to do.
Recently I removed the fan that blows the smoke away because it was whining a bit and getting on my nerves.
So instead I tried using a piece of glass cut from an old flatbed scanner, on top of the workpiece.
Seems to be good quality clear glass, I suppose it had to be if it was in a scanner.
This stops the Laser from producing smoke and also soot.
It does however produce a sticky residue on the back of the glass, but that can be cleaned off in soapy water.
I was quite surprised at the results.