Cutter Compensation

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  • July 14, 2016 at 6:21 pm #9840
    boomer3
    Member

    Hi Guys, I’m not having success with cutter compensation commands G40, G41, G42. I am using the TinyG V8 and the Chilipeppr GUI. Does this controller support cutter compensation commands? It could just be that I am implementing incorrectly as a novice. I am using DXF2GCODE for some simple pocket/outline milling, (and some drag knife cutting). It has a cutter compensation, but I don’t know if it is generating the code properly. Please have a look at the sample code, it is for a simple rectangle cut clockwise, G41 (climb milling to the LHS), using a ~3mm diameter bit. Do I need to append the G41 command with more variables? Feel free to refer me elsewhere, thanks for the help.

    (Generated with: DXF2GCODE, Version: Py3.4.4 PyQt5.4.1, Date: $Date: Sun Apr 17 16:32:22 2016 +0200 $)
    (Created from file: C:/Users/Braden/Desktop/MBR/CAD Files/Sheet – Solar Panel Drill Template 1.dxf)
    (Time: Thu Jul 14 17:13:40 2016)
    G21 (Units in millimeters) G90 (Absolute programming) G64 (Default cutting) G17 (XY plane) G40 (Cancel radius comp.) G49 (Cancel length comp.)
    G0 Z 3.000

    (*** LAYER: SHEET_-_SOLAR_PA ***)
    T2 M6
    S6000

    (* SHAPE Nr: 5 *)
    G0 X -4.550 Y -1.500
    M3 M8
    G41
    F200
    G1 X -3.050 Y -3.050
    G3 X 0.000 Y 0.000 I 0.000 J 3.050
    G0 Z 3.000
    F150
    G1 Z 0.000
    F200
    G1 X 0.000 Y 138.857
    G1 X 165.500 Y 138.857
    G1 X 165.500 Y 0.000
    G1 X 0.000 Y 0.000
    F150
    G1 Z 3.000
    G0 Z 3.000
    G40
    M9 M5
    G0 X 0.000 Y 0.000
    M2 (Program end)

    July 18, 2016 at 5:21 am #9848
    cmcgrath5035
    Moderator

    Simple answer – No.
    See

    You need to find a Gcode generator that will handle compensation in the Gcode.

    July 19, 2016 at 10:56 pm #9853
    boomer3
    Member

    Thanks.

    Any suggestions as to where I might find that? Is there a program i can run as a post processor to interpret pre existing g-code and augment for a cutter?

    July 20, 2016 at 7:03 am #9854
    cmcgrath5035
    Moderator

    Sorry, no, but I have never really dug into it.
    You could search around the Ox or Chilipeppr Forums, I have seen the topic mentioned but have not focussed on solutions.

    I would sort of doubt a “simple” post processor solution would work well.
    It can be a fairly complex topic when you think about it.
    Say you draw a circle and generate Gcode.
    Gcode, per se, has no knowledge of whether you want to end up with perfectly dimensioned holes or perfect dimensioned discs, etc.

    You are likely to find solutions in 2.5 or 3D CAD systems, where the profiling operations are very dependent on tool dimensions and shapes.

    If you do find a good solution, please report back – the topic does come up from time to time.

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