The scale is not constant throughout a galvo field. For example if you calibrate scale to draw a 25mm square accurately in the center, then etch a 200mm square, the 200mm will dimensions will be off.
For small fields (100mm) this issue is minimized, but I’m going up to 430mm FL and if I calibrate to do a 6in square properly, the 11in square will be around 11.25in across.
We need a scaling correction for the scale. A simple coefficient should be adequate: 1.0 at the center going to something else at the perimeter.
Yes I’ve used corfile2 and carefully measured everything. This eliminates distortion but does not address the varying field scale from center to edges.
Curious if you went smaller, would a 3" measure 2.75"? Or if you were dialed in at 11", what size would the 6" be?
The newest LB has a lens distortion correction in the laser tools menu, watched the LMA video this morning. Maybe that will work if you don’t have the markcfg7 file.
It can be implemented in software. I don’t think it will be difficult. Instead of scale being a constant, it will be multiplied by a coefficient. I think a linear approximation will be close enough. You mark two squares, measure them, and put the dimensions into the software. It calculates the coefficient. It doesn’t seem like a complex addition.
It’s not a simple linear equation, but it’s something we’re working on. We release things in stages, and the 9 point is the first stage. We have lots of other things in the works, so please be patient.
