Been trying to solve this one for a while with no luck… when using the cut path optimization the actual cut is off.
Below you can see my cut path settings, what the cut is supposed to be, and the actual cut. I’ve been sending the file to my laser and starting it from there, rather that running it from within lightburn (tried both ways actually)
Just to clarify, the cut is perfect if I turn off cut path optimization.
Thoughts? Thanks!
Because optimization changes the overall trajectory, it can reveal (or hide!) hardware problems.
The internal cuts appear to be gradually drifting toward the bottom of the pattern, away from the upper perimeter parallel to the Y axis. That suggests the Y axis motor is gradually losing steps.
Because it apparently works well under other conditions, loose mechanical bits seem unlikely. However, you should verify that the Y axis moves freely by hand (with the power off!) over the entire travel range, because crud does collect on the linear slides.
Reduce the Y axis acceleration by a factor of four. My OMTech 60 W is set to 3000 mm/s², so if yours is similar, reduce it to 750 mm/s². A lower acceleration reduces the motor torque required to shove that heavy gantry around and should make the problem Go Away, although it will also reduce the speeds along short line segments and probably cause excessive scorching.
Run the pattern again and see what happens.
If it looks better, then double the acceleration and repeat.
When the problem returns with increased acceleration, cut the acceleration in half, verify it works, and declare victory. You’ll probably need to adjust the minimum power levels to reduce scorching, but at least the patterns will be correct and that’s a good start.
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