So, when I ask my cutter to cut a 400m square, it comes out 404mm wide.
The front-panel display suggests the laser thinks it is cutting at 400mm, so I think this is a settings problem in the Ruida controller.
In Lightburn, if I go to Edit / Machine Settings and expand ‘X axis settings’, I can see
Step length (um) : 8.965
And similarly for the Y axis I see
Step length (um): 4.476
I presume that’s the source of the problem, and I should set those to a value that is cunningly calculated from
- Steps per revolution
- Microstepping factor
- Pulley tooth count
- Belt tooth spacing
Before I go find all those facts, I’d be interested to know if there were conventional values for these step lengths that would save me the trouble.