I’m not sure if this is a problem with our Boss Laser 1420 machine (less than 1 year old) and/or a LightBurn interfacing problem. The problem is that markings from the 1st to the 12th part in an array are not centered on the part. The difference is greatest on the Y Axis of 0.020" and is always in the positive direction. The off center is progressive, centered on the 1st part and off the 0.020" total on the 12th.
Thank you for your help.
I’d suspect one of two things:
Machine calibration is a little off - If you make a vertical line exactly 300mm long, does it measure 300mm?
The Y axis is slipping when moving between the parts of the cut. If this is happening, the Y acceleration or line shift speed could be too high. (These are in Edit > Machine Settings, under Engraving Parameters)
Thank you for the quick reply.
I marked a 12" x 16" rectangle. The 12" (Y Axis) is off approx 0.007" and the 16" (X Axis) is off approx. 0.015". Across corners of the rectangle is within 0.030". One image shows the corners identified. Between A & C the measurement is approx. 21.000", between B & D the measurement is approx.21.030". Looks more like a parallelogram than a rectangle.
*We also tried marking one part at a time, the markings drifted off center of the part approx. 0.020" within 6 parts.*Can I make the changes to the machine parameters to correct for these errors?
Thank you for the help !
You can correct for both of these in the settings, yes.
Go to Edit > Machine Settings.
Before changing things, it’s a good idea to save a copy of the current settings, just in case.
At the bottom, ‘Calibrate Axis’ will let you choose one of the axis of the machine, and enter a ‘requested’ value and a ‘measured’ value, and will compute the step length adjustment for you. Do one axis at a time.
For the engraving, in the top under “Engraving Parameters” lower the Y acceleration by about 20% and try that for starters. It should make very little difference in the engraving time, but should help eliminate the slip when moving between parts.
The speed is not important, we load/run he machine between other operations. We are more concerned with repeatability and quality. At the moment the acceleration parameters are 3000 mm/s² for the X axis and 2000 mm/s² for the Y axis. I’ll cut the X & Y accelerations by 75% as a test.
I really appreciate the help !
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