Hope everyone is keeping well!
I have a question for you regarding skewing of an engraving I’m doing on acrylic.
I have setup scan offsets for all my engraving speeds in LightBurn but find I’m getting a slightly skewed out on the lettering and the circle I’ve been trying to engrave.
The diameter of the logo is 125mm, and the scan measures OK left to right and up and down, but skews
about 3 to 4 degrees to the top left, this also applies to the lettering, please see attached.
Has anyone come across this problem?
Is there setting in LightBurn or the controller (Ruida 6445g ) I need to further adjust?
I’ve run the job at 400mm/s and 300mm/s and also with scan offsets off and I get almost the same results.
When I do cutting I get accurate and square cuts.
Any suggestions be appreciated.
Have a look at this thread and see if it fits your situation:
This is an example of a fill followed by a cut around the letter A:
The fill is slanted, but the cut appears to be correct.
If you have engraving that is slanting to one side, but cuts appear correctly, you likely have your motor pulse step polarity set incorrectly. On Ruida controllers, there’s a setting called ‘PWM Rising Edge Valid’ that you can change for each axis that tells the controller whether the rising edge or falling edge of a step pulse is what the motor driver is lookin…
Excessive acceleration can also cause the steppers to loose a step during direction change, but I would start with the link above.
I’ll try your suggestions
And let you know the outcome
I fixed this problem with the rising edge valid fix. I forget now which one was wrong, but on my Ruida they both match now, and one was false and one was true in my settings. Try both ways. If I had to guess it was my Y set to false and it should have been true, but just going by memory.
Good way to check if that’s the likely issue is do a test engrave on some cardboard, and set it to fill+line. If that’s the issue the engrave will be skewed, but then the line will go back and outline properly. That pretty much should confirm a setting and not hardware problem, that’s what I had.
Enabling PWM to rising on X and Y axis solved the problem, I had to further tweak the over scan offset to correctly line up both the scan and line output.
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