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IndustryArena Forum > CAM Software > Autodesk CAM > Autodesk Post Processors > UCCNC post processor - weird move G0 G53 X0 on start?
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  1. #1
    Join Date
    Jan 2018
    Posts
    9

    Question UCCNC post processor - weird move G0 G53 X0 on start?

    Hi!

    I am new to CNC, so maybe I have some misunderstanding.

    My CNC mill is setup with Z-Axis counting upwards, Z-endstop mounted so home-position is UP and is at 0(mm). Soft-limits are set to 0.1mm (upper) and -130.1mm (lower). So in fact I am working with negative Z heights.

    I am using Fusion 360 with its integrated CAM and the UCCNC post from the autodesk website (latest).

    All my GCode-files start with:
    Code:
    G90
    G0 G53 Z0.
    later in the program, it happens that
    Code:
    G0 Z15
    is set, so hitting the softlimit (and endstop).

    I could set Z home postion to 130 and work with positive Z heights.

    Yet what makes me wonder is the "G53". From my understanding it forces the machine to zero Z in its MCS, which makes absolutely no sense to me. From my understanding, I jog the machine to the desired zero-position and zero XYZ in the WCS. Then the programm uses the WCS exclusively. Why is there a reference to the MCS? It makes the machine move away from my desired Z height!

    Best regards,
    Robert

  2. #2
    Join Date
    Mar 2003
    Posts
    35538

    Re: UCCNC post processor - weird move G0 G53 X0 on start?

    Whoever wrote the post thought it was a good idea??
    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)

  3. #3
    Join Date
    Jan 2018
    Posts
    9

    Re: UCCNC post processor - weird move G0 G53 X0 on start?

    Is this a statement or a question?

    Sometimes I assume that in fact other people do something by intend. In this case, I would assume that the "G53" is perfectly right under the assumption that my setup is somehow not properly set up or at least in some unusual way. Not I am looking for feedback in a way that either a) I can align my setup to the standard or b) somebody tells me its perfectly ok to alter the post as the G53 is unusual there.

    Best regards,
    Robert

  4. #4
    Join Date
    Mar 2008
    Posts
    1762

    Re: UCCNC post processor - weird move G0 G53 X0 on start?

    In a number of CNC controls that I am familiar with numerous actions have the G53 Z0 associated to them.

    This is simply lifting the Z to its max height, "0" using the MCS. It should not matter if you are using the MCS or any of the WCS offsets. I would expect this is normal on all machines with a z homing switch and unusual on those that do not.
    Gary Campbell CNC Technology & Training
    GCnC411 (at) gmail.com www.youtube.com/user/Islaww1/videos

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