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Noob struggling with G54 and homing

Discussion in 'CAM' started by Greg Aldrich, Dec 18, 2022.

  1. Greg Aldrich

    Builder

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    Hello all,

    Trying to make my first cut with my 1515 - just a simple circle I made in fusion 360.

    I homed the machine, then set the work zero with the probe.

    When I start the job, the X axis first goes to the left and hits the limit switch. (first screenshot)

    upload_2022-12-18_23-12-45.png

    Can get a little farther if I start the job again. but when the X comes off the limit switch it stops again.

    First 50 lines of Gcode:


    (Made in : Autodesk CAM Post Processor)
    (G-Code optimized for synced_configuration controller)
    (OpenBuilds CNC : GRBL/BlackBox)
    (Post-Processor : OpenbuildsFusion360PostGrbl.cps V1.0.31)
    (Units = inch)

    (Drawing name : 19circle v2)
    (Program Name : 1001)

    (1 Operation :)
    (1 : 2D Contour2)
    ( Work Coordinate System : G54)
    ( Tool 2: Flat End Mill 3 Flutes, Diam = 0.2495inch, Len = 0.73inch)
    ( Spindle : RPM = 5000, set router dial to 1)
    ( Machining time : 6 min 21 sec)

    G90 G94 G17
    G20

    (When using Fusion 360 for Personal Use, the feedrate of)
    (rapid moves is reduced to match the feedrate of cutting)
    (moves, which can increase machining time. Unrestricted rapid)
    (moves are available with a Fusion 360 Subscription.)

    (Operation 1 of 1 : 2D Contour2)
    G54
    (This relies on homing, see Search Results for Query: G53 fusion | OpenBuilds )
    G53 G0 Z-0.3937
    G0 X-9.6996 Y-0.0249
    S5000 M3
    G4 P1.8
    G0 X-9.6996 Y-0.0249 Z0.6 F40
    Z0.2394
    G1 Z-0.1751 F13
    X-9.6984 Z-0.1828 F40
    X-9.6948 Z-0.1897
    X-9.6893 Z-0.1952
    X-9.6824 Z-0.1988
    X-9.6747 Z-0.2
    X-9.6497
    X-9.642 Y-0.0237
    X-9.635 Y-0.0202
    X-9.6295 Y-0.0147
    X-9.626 Y-0.0077
    X-9.6247 Y0
    G2 X9.6247 Y0 I9.6247 J0
    X-9.6247 Y0 I-9.6247 J0
    G1 X-9.626 Y0.0077
    X-9.6295 Y0.0147
    X-9.635 Y0.0202
     
  2. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    X and Y and Z ?
    at bottom left of your workpiece?
    from the code it looks like your work zero is the middle of the worpeice, so you need to 'setzero' X and Y there.
    without rehoming? DO NOT DO THAT!
    always always always home before doing anything else.

    This is why
    Home, Fusion360 and G53 Z moves
     
  3. Greg Aldrich

    Builder

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    Well that's what it was looking like to me as well, currently trying to figure out why (facepalm)

    Yes without rehoming, but currently air-cutting and trying to learn why it's doing things.

    Thank you for the help.

    Would prefer not to set zero to the middle of the workpiece so currently searching how to start at the corner
     
  4. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    in Fusion360 you have to move the origin of the setup.
     
  5. Greg Aldrich

    Builder

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    Apologies for the delay @David the swarfer, family, christmas, and installing a wood stove in my shop got in the way of making any progress on this.

    Had thought that I properly set the origin point but I guess not.

    Hoping to try again tonight.
     
    David the swarfer likes this.

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