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


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    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.
    [/CODE]

    later in the program, it happens that
    [CODE]G0 Z15[/CODE]
    is set, so hitting the softlimit (and endstop).

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

    [B]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![/B]

    Best regards,
    Robert

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

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

    Gerry

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    Default 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



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    Default 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 GCnC Control
    Servo Control & ATC Retrofits


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

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