I drew 2 circles in LB as below:
outside circle has diameter = 32mm
inside circle has diameter = 14mm
And then laser cut at polywood as below result:
outside circle has a slightly bigger diameter = 32.15mm (measured at Y-axis) and 32.70mm (measured at X-axis)
inside circle has a smaller diameter = 12.75mm (measured at Y-axis) and 13.22mm (measured at X-axis)
So it’s no use to do “Calibrate Axis”.
I thought I probably need to do some hardware tuning.
But after asking machine vendor for advise, I did following to find out problems:
1.Export LB file to a svg file, and then open it with LaserGRBL.
2.Do laser cut in LaserGRBL.
This time I got almost perfect concentric circles with 31.86mm and 13.94mm. It seems that hardware is not the problem.
So I save gcode in LaserGRBL and LB for comparison:
LaserGRBL:
M3 S0
S0
G0X32Y16
S1000
G3X32Y16I-16J0F240
S0
G0X23Y15.9
S1000
G3X23Y15.9I-7J0F240
S0
M5 S0
; LightBurn 1.0.02
; GRBL device profile, current position
; Bounds: X-0.43 Y-0.43 to X32.43 Y32.43
G00 G17 G40 G21 G54
G91
M4
; Cut @ 4 mm/sec, 100% power
M8
G0X12.867Y10.32
; Layer Text
G1X-0.558Y0.34S1000F240
G1X-0.477Y0.356
G1X-0.48Y0.433
G1X-0.438Y0.485
G1X-0.355Y0.476
G1X-0.352Y0.574
G1X-0.273Y0.575
G1X-0.207Y0.57
G1X-0.164Y0.621
G1X-0.106Y0.695
G1X-0.031Y0.676
G1X0.031Y0.633
G1X0.106Y0.691
G1X0.16Y0.614
G1X0.211Y0.582
G1X0.273Y0.574
G1X0.352Y0.578
G1X0.355Y0.473
G1X0.438Y0.484
G1X0.48Y0.434
G1X0.492Y0.371
G1X0.528Y0.316
G1X0.609Y0.297
G1X0.586Y0.215
G1X0.605Y0.152
G1X0.676Y0.102
G1X0.672Y0.039
G1X0.672Y-0.039
G1X0.676Y-0.102
G1X0.605Y-0.152
G1X0.586Y-0.215
G1X0.609Y-0.297
G1X0.528Y-0.316
G1X0.492Y-0.371
G1X0.48Y-0.434
G1X0.438Y-0.484
G1X0.355Y-0.473
G1X0.352Y-0.578
G1X0.273Y-0.574
G1X0.211Y-0.582
G1X0.161Y-0.614
G1X0.105Y-0.691
G1X0.031Y-0.672
G1X-0.031Y-0.637
G1X-0.105Y-0.695
G1X-0.165Y-0.621
G1X-0.207Y-0.57
G1X-0.273Y-0.575
G1X-0.352Y-0.574
G1X-0.355Y-0.476
G1X-0.438Y-0.485
G1X-0.48Y-0.433
G1X-0.477Y-0.356
G1X-0.558Y-0.34
G1X-0.594Y-0.289
G1X-0.586Y-0.215
G1X-0.605Y-0.152
G1X-0.68Y-0.101
G1X-0.668Y-0.036
G1X-0.668Y0.036
G1X-0.68Y0.101
G1X-0.605Y0.152
G1X-0.586Y0.215
G1X-0.594Y0.289
G0X-10.48Y-3.511
; Layer Text
G1X-0.275Y0.418
G1X-0.262Y0.427
G1X-0.248Y0.434
G1X-0.234Y0.441
G1X-0.221Y0.449
G1X-0.206Y0.455
G1X-0.193Y0.462
G1X-0.178Y0.468
G1X-0.254Y0.742
G1X-0.172Y0.593
G1X-0.15Y0.598
G1X-0.128Y0.604
G1X-0.104Y0.608
G1X-0.102Y0.801
G1Y0.023
G1X-0.053Y0.625
G1X-0.029Y0.626
G1Y0.626
G1X0.016Y0.627
G1Y0.019
G1X0.046Y0.621
G1X0.067Y0.618
G1X0.09Y0.615
G1X0.113Y0.611
G1X0.183Y0.788
G1X0.221Y0.777
G1X0.259Y0.766
G1X0.298Y0.751
G1X0.328Y0.731
G1X0.352Y0.687
G1X0.011Y0.016
G1X0.243Y0.431
G1X0.255Y0.422
G1X0.268Y0.414
G1X0.279Y0.405
G1X0.291Y0.397
G1X0.302Y0.388
G1X0.314Y0.378
G1X0.325Y0.368
G1X0.336Y0.359
G1X0.346Y0.349
G1X0.356Y0.338
G1X0.367Y0.328
G1X0.377Y0.317
G1X0.386Y0.306
G1X0.396Y0.294
G1X0.406Y0.283
G1X0.418Y0.275
G1X0.427Y0.262
G1X0.434Y0.248
G1X0.441Y0.234
G1X0.449Y0.221
G1X0.455Y0.206
G1X0.462Y0.193
G1X0.468Y0.178
G1X0.742Y0.254
G1X0.593Y0.172
G1X0.598Y0.15
G1X0.604Y0.128
G1X0.608Y0.104
G1X0.801Y0.102
G1X0.023
G1X0.625Y0.053
G1X0.626Y0.029
G1X0.626
G1X0.627Y-0.016
G1X0.019
G1X0.621Y-0.046
G1X0.618Y-0.067
G1X0.615Y-0.09
G1X0.611Y-0.113
G1X0.788Y-0.183
G1X0.777Y-0.221
G1X0.766Y-0.259
G1X0.751Y-0.298
G1X0.731Y-0.328
G1X0.687Y-0.352
G1X0.016Y-0.011
G1X0.431Y-0.243
G1X0.422Y-0.255
G1X0.414Y-0.268
G1X0.405Y-0.279
G1X0.397Y-0.291
G1X0.388Y-0.302
G1X0.378Y-0.314
G1X0.368Y-0.325
G1X0.359Y-0.336
G1X0.349Y-0.346
G1X0.338Y-0.356
G1X0.328Y-0.367
G1X0.317Y-0.377
G1X0.306Y-0.386
G1X0.294Y-0.396
G1X0.283Y-0.406
G1X0.275Y-0.418
G1X0.262Y-0.427
G1X0.248Y-0.434
G1X0.234Y-0.441
G1X0.221Y-0.449
G1X0.206Y-0.455
G1X0.193Y-0.462
G1X0.178Y-0.468
G1X0.254Y-0.742
G1X0.172Y-0.593
G1X0.15Y-0.598
G1X0.128Y-0.604
G1X0.104Y-0.608
G1X0.102Y-0.801
G1Y-0.023
G1X0.053Y-0.625
G1X0.029Y-0.626
G1Y-0.626
G1X-0.016Y-0.627
G1Y-0.019
G1X-0.046Y-0.621
G1X-0.067Y-0.618
G1X-0.09Y-0.615
G1X-0.113Y-0.611
G1X-0.183Y-0.788
G1X-0.221Y-0.777
G1X-0.259Y-0.766
G1X-0.298Y-0.751
G1X-0.328Y-0.731
G1X-0.352Y-0.687
G1X-0.011Y-0.016
G1X-0.243Y-0.431
G1X-0.255Y-0.422
G1X-0.268Y-0.414
G1X-0.279Y-0.405
G1X-0.291Y-0.397
G1X-0.302Y-0.388
G1X-0.314Y-0.378
G1X-0.325Y-0.368
G1X-0.336Y-0.359
G1X-0.346Y-0.349
G1X-0.356Y-0.338
G1X-0.367Y-0.328
G1X-0.377Y-0.317
G1X-0.386Y-0.306
G1X-0.396Y-0.294
G1X-0.406Y-0.283
G1X-0.418Y-0.275
G1X-0.427Y-0.262
G1X-0.434Y-0.248
G1X-0.441Y-0.234
G1X-0.449Y-0.221
G1X-0.455Y-0.206
G1X-0.462Y-0.193
G1X-0.468Y-0.178
G1X-0.742Y-0.254
G1X-0.593Y-0.172
G1X-0.598Y-0.15
G1X-0.604Y-0.128
G1X-0.608Y-0.104
G1X-0.801Y-0.102
G1X-0.023
G1X-0.813Y-0.062
G1X-0.019
G1X-0.418Y-0.019
G1X-0.418
G1X-0.418
G1X-0.418Y0.015
G1X-0.019
G1X-0.621Y0.046
G1X-0.618Y0.067
G1X-0.615Y0.09
G1X-0.611Y0.113
G1X-0.788Y0.183
G1X-0.777Y0.221
G1X-0.766Y0.259
G1X-0.751Y0.298
G1X-0.731Y0.328
G1X-0.687Y0.352
G1X-0.016Y0.012
G1X-0.431Y0.242
G1X-0.422Y0.255
G1X-0.414Y0.268
G1X-0.405Y0.279
G1X-0.397Y0.291
G1X-0.388Y0.302
G1X-0.378Y0.314
G1X-0.368Y0.325
G1X-0.359Y0.336
G1X-0.349Y0.346
G1X-0.338Y0.356
G1X-0.328Y0.367
G1X-0.317Y0.377
G1X-0.306Y0.386
G1X-0.294Y0.396
G1X-0.283Y0.406
M9
G1S0
M5
; return to starting pos
G0 X-2.387Y-6.809
M2
All I know is that gcode in LaserGRBL is quite short. But stlil, I don’t know how to correct the problem in LB. Any suggestion would be appreciated.
