I’m having some issues with the alignment of my homebrew laser. (size 150cm x, 100cm y )
I followed the guides and used some common sense to get everything aligned.
Works well, except for one thing: I can only get 3 out of 4 positions (A,B,C,D) perfectly aligned where the beam hits mirror 3 at exactly the same spot. At the fourth position, the beam is as much as 5mm off in height at mirror 3.
Tried everything, realigned, different sequence for alignment, etc. The only thing that happens is that the position where it’s off changes between A,B and D.
Moving Y-axis does not change the position of the spot at mirror 2.
Moving the X-axis from B to A does not change position of the spot at mirror 3.
But when moving from C to D, the spots moves up…
I thought: perhaps it’s twisted: the Y rails not perfectly parallel. But that’s not it. I actually made it non-parallel on purpose, adding some shims to lift the rail 3-6 mm at position a/b/c/d and went through more rounds of mirror alignment, but the offset remains the same.
It’s driving me bonkers. Any Ideas?