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Laser repeatability

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Laser
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2023-11-22

I doubt this pertains to Lightburn directly but I’ve tried other groups and zero help. I have an OMTech 60 2028 red n black. I find that it if set multiple passes on a cut line it ‘appears’ to be ok. if i set multiple passes on an engraving, the head goes back to origin then proceeds to perform second pass. It’s always off just a tad making a 2 or 3 pass engraving impossible.
I’ve tightened belts, calibrated axis(s) and ensureed mirrors are dead on. I’m totally stumped on how to fix this.
Just trying different avenues for help. Thanks
C

    • Henry

      2023-11-23
      Origin or home? Is there a difference on your machine? On GRBL, it’s two different locations. Home trips the endstops. Origin does not. Mine are separated by 4mm.

Why is it returning to “origin”? This shouldn’t be necessary if your machine is otherwise accurate. Do the steppers idle down during this process? If so, you may be losing microsteps or even full steps.

If going to "home’, depending the homing switch type and mounting, homing accuracy can be less precise than axis motion. Any little flex, bounce, delay, etc in the switch setup (both mechanical and electrical) can change zero relative to the workspace. Not sure what setup variables you can adjust on your machine (I don’t have a CO2), but on a GRBL machine, after verifying/eliminating any mechanical flex, I’d try slowing down the home seek rate at $24.
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