When I engrave, my lines are slightly more spaced apart than they should be. For example, if I mark 2 dots 500mm apart, they are actually 500.2mm apart. HOWEVER, when I cut objects, the dimensions are exact. How can I adjust/account for this discrepency only when I’m engraving, but not while cutting? I’m noting this as I try to engrave a precise waste board.
It seems as though you’re not taking the width of the cut into account. If you measure the dots center-to-center, they should be spot on the commanded distance, but a rectangle cut to the same dimensions will be slightly scant due to the kerf.
You should calibrate the step/mm (or mm/step) values for the X and Y axes:
I used an accurate scale and the red-dot pointer on my OMTech laser:
After calibrating those values, you can measure the kerf and use that to compensate the size of the objects:
The kerf width depends on the material and, for diode lasers with rectangular spots, the cut direction, so you will need specific tweaks for critical objects.
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