When I cut through acrylic using my 150w laser I cannot get a perfect 90 degree cut . any ideas ?
I have put paper on my lens and checked and all seem to be aligned.
really don’t fancy spending 10k on a diamond polish machine to get perfect edges for welding
I was reading that the last mirror is probably the culprit. I’d make sure you’re perfectly perpendicular to your bed on the last one. You can use a piece of acrylic to shoot the laser into, and watch which way the beam goes.
Laser beams cut with a cone shape in the cross-section so that the cut always makes a small angle between the cut surface and the face. Could that be the problem?
What focal length lens are you using and how thick is the acrylic?
If you are mostly cutting acrylic to glue together, look at a 4" lens as the beam edges are more parallel, but the beam is wider. You may need to make a kerf adjustment.