by BenJackson » Fri Sep 30, 2011 10:56 pm
I think the glue in the 3/16" 4-ply "hobby plywood" must be a perfect IR mirror. I'm not sure the laser cut the glue at all (especially the middle layer) -- it just sometimes gets destroyed by nearby burning wood. 3/16" is actually slightly thinner than 5mm (which I've been cutting fine) but it took me multiple passes to even get through this stuff and if I used enough power to get through it was badly charred. Lower power would cut through the top layer only and never go through the glue at all.