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IndustryArena Forum > WoodWorking Machines > Commercial CNC Wood Routers > Chinese Machines > GRBL 1.1 Cutting arc on the Z-axis using G2 command?
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  1. #1
    Join Date
    Oct 2019
    Posts
    7

    GRBL 1.1 Cutting arc on the Z-axis using G2 command?

    I have a piece I need to cut a 180 circle out of in the Z-axis. From what I've read, this would be supported by something like this...

    G91
    F100
    G2 X0Y0Z0 I0 J0 K-2

    But when I run that, all I get is "OK" back without movement. Any ideas?

  2. #2
    Join Date
    Aug 2009
    Posts
    230

    Re: GRBL 1.1 Cutting arc on the Z-axis using G2 command?

    You have asked for a circle with zero radius. The arc commands work by moving to the start point, then in the g2/g3 command specifying the end point, and specifying the incremental distance in I and J words. Grbl mostly follows the gcode standard specifyed by Linuxcnc, so have a look at Linuxcnc’s reference documentation for g2 and g3 for more information.

  3. #3
    Join Date
    Oct 2019
    Posts
    7

    Re: GRBL 1.1 Cutting arc on the Z-axis using G2 command?

    thanks that helped... looks like needed to switch planes to XZ first and then attempt the move with I and J.

    G18
    G2 X0 Z0 I1 J-1 F50

  4. #4
    Join Date
    Mar 2003
    Posts
    35538

    Re: GRBL 1.1 Cutting arc on the Z-axis using G2 command?

    Yes, you need to change planes. Not sure if GRBL supports G18-G19 though?
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  5. #5
    Join Date
    Aug 2009
    Posts
    230

    Re: GRBL 1.1 Cutting arc on the Z-axis using G2 command?

    G17, G18, & G19 are supported.

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