I’ve been going nuts this weekend trying to cut some wood gift tags using the laser module. I bought some plywood squares for this (https://www.amazon.ca/gp/product/B08K7F8ZMM/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1).
I’ve had good success with tiles (I posted a thread on that).
The demo project using the included wood cut very well, though that wood is just 1.5 mm thick, and feels softer. Now I don’t have any more of the original sample wood.
My original install of the laser module easily autofocused and said my focal distance is 23 mm.
Since then, after going to 3D printing and back, the autofocus calibration just doesn’t work - no matter if I use paper, different woods (2.2 mm plywood, 4.9 mm plywood, 2x4) - it barely burns the first few calibration lines on the left (even then poorly) then fails.
Nevertheless I manually set my focal distance to 23 mm and got to work.
The laser engraves and image onto the wood with no issues really, but cutting isn’t working at all.
I’ve tried the following in Lightburn, and none of these successfully burned through the 2.2 mm plywood, not even close:
Speeds from 40-120 mm/min, 100% power, 4 passes, 0.4mm zstep per pass
Speeds from 100-120, 100% power, multipass 3-4, pass depth 0.4 mm
The laser guide says we should be able to cut 2.2mm plywood with workspeed 120 mm/min, multipass 3, pass depth 0.4
No matter which program I’m using, the burn doesn’t go anywhere near through the piece - I can definitely feel deeper burns with my fingernail, and more surface smoke staining with the slower speeds, but it isn’t cutting more than a very thin depth and nowhere even near 1/4 way through.
I’ve tried manual focus but it’s really hard to see the laser dot and whether it’s smaller or not, and varying my manual focal length +/- 0.5-1 mm from the 23 mm original autofocus hasn’t helped.