XYYZ Kinematics: G2/G3 Arc Direction Inverted in LinuxCNC
28 Jun 2026 16:24 - 28 Jun 2026 17:10 #347371
by Estley
XYYZ Kinematics: G2/G3 Arc Direction Inverted in LinuxCNC was created by Estley
I had to use Claude to help me write the post since i'm new at this so please excuse me, I'm attaching my .ini and .hal files, thanks in advance!!:
Diagnosis: With corrected Fusion360 machine definition (Z up, X right, Y forward), linear motion executes correctly. However, G2 (clockwise) and G3 (counter-clockwise) commands execute in opposite directions.Tested: Triangle draws correctly. Circle with G3 (counter-clockwise) draws clockwise.Question: Is there a XYYZ kinematics setting or HAL configuration that controls arc direction in LinuxCNC?I'm also atteching a picture of my machine:
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28 Jun 2026 17:35 #347373
by Aciera
Replied by Aciera on topic XYYZ Kinematics: G2/G3 Arc Direction Inverted in LinuxCNC
You have setup your machine as a left handed coordinate system instead of the standard right handed system:
Some people get confused by the machine Y only moving in the negative direction from home but that is irrelevant since the actual work is going to be referenced to a work coordinate system (ie G54 ... G59) which can be setup anywhere.
Some people get confused by the machine Y only moving in the negative direction from home but that is irrelevant since the actual work is going to be referenced to a work coordinate system (ie G54 ... G59) which can be setup anywhere.
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