I have been adjusting both my X and Y axis to cut a 4" by 4" square. When I was adjusting the X axis it took the input of the actual size and I am happy with the result. However the Y axis seems to be doubling the input that I enter or there are other issues. I am also dealing with a Square that is not square. I think the 2 problems are related . I think I need to adjust the “rod” that links the 2 belts for the X axis to get the gantry square to the base. Right now it is out about 0.02. But the Y axis not taking the adjustments doesn’t make sense to me. Can it be reset to factory and start over. Any help is appreciated.
Atezr P20 Diode Laser
Where are you making these adjustments?
Within Lightburn machine settings
“Square is not square”, meaning rectangular or parallelogram/rhombus?
Not trying to sound difficult but the tops appear parallel but the sides are slanted. A true square should be able to be placed back into the part it was cut from in any orientation. My trouble determining the issue is I am taking multiple measurements along both Axis and getting different results. I am trying to get to the same (+/- .005) on 1 Axis then adjust the other. I believe the out of square issue is preventing this.
That’s what I’m probing for. You seem to be describing a parallelogram. This would be a mechanical issue. You need to ensure the main frame is true square and the gantry is square to the mainframe. I’m not sure how the P20 is designed, so belt tension and left/right pinion alignment may be critical. On some (pinion drive/roller constrained), it can force the gantry out of square when power is applied.
I like to set belt tension with a loose shaft coupler, then square the gantry and tighten down the coupler. Any time I adjust y axis belt tension, I reset the gantry square and coupler.
you have given me a starting point. I m going back to step 1 and making sure my frame is straight. I do see the gantry “flex” when power is applied in movement. I will work on starting with square frame and post my results as I go.
Are you making sure to write back after you make an adjustment?
Yes,
I am hitting the word Write at the bottom and then verifying it took the adjustment
Your Process seems to have fixed my issues. I think the key was loosening the shaft coupler after tensioning. I also removed the gantry so both side were independent and ran them against the hard stops. Once this was accomplished I ran a test burn and dialed in the X and Y axis. The both came in on the first try. I can now burn a 4" square and rotate it in the cutout.
Thanks everyone for the help.
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Good to hear. 
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