Wrong shape cut

[typepub]

Hi,

I downloaded the trial version of LightBurn and I want to use it to cut G-Code generated from Fusion 360. My problem is that the shapes that are cut by LightBurn are wrong.

I tried the same G-Code using LaserWeb and it cuts perfectly.

Here is an example:

The G-Code is:
%
(1001)
(Machine)
( vendor: Autodesk)
( description: Generic Cutting Machine)
G90 G94
G17
G21
(2D Profile3)
G54
G0 S1000 M4
G0 X45.25 Y68.517
G1 X45 Y68.95 F500
G1 X38 F175
G3 X38 Y66.05 Z2 I0 J-1.45
G1 X45
G3 X45 Y68.95 I0 J1.45
G1 X44.75 Y68.517 F500
G1 S0
M30
%

The simulation of LighBurn also shows the problem:

Is there any setting to solve this please?

Thanks.

Best regards

[berainlb (PY)]

Your workflow is a bit strange. Is there a reason why you’re trying to use g-code as a transfer format?

If you want to run g-code from LightBurn you do so by pushing the “Run GCode” button in Laser window. Note that you get no opportunity to modify anything at that point.

Typically if you’ve done your design in F360 or other modeling program you would export it in a vector format like DXF or SVG, import it into LightBurn, apply adjustments, adjust layer settings, then burn.

[RalphU (RU)]

Lightburn doesn’t support circular interpolation in Gcode. (G2,G3, I and J codes)

[typepub]

Hello,

Thanks @RalphU for your explanation, it is certainly the reason of this behaviour.

And thanks @berainlb for your proposal, these solutions are great.

Thanks to both for your quick and relevant answers

[MikeyH (Mike Hembrey)]

@RalphU

Lightburn doesn’t support circular interpolation in Gcode. (G2,G3, I and J codes)

@berainlb

If you want to run g-code from LightBurn you do so by pushing the “Run GCode” button in Laser window.

The GRBL controller does support circular interpolation, and LaserWeb likely is only a pass-thru software package. Same as LB’s Run Gcode button.