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  1. #1
    Join Date
    Jan 2015
    Posts
    3

    G90 and G91, no difference

    Hi

    I have a Midwell with FANUC O-M controller.

    In MDI-mode I run:

    G90 G00 X10 Y10

    Instead of moving absolute it's moving incremental, there is no difference if I run with G91.

    Which parameters can affect this?

    Thanks!

  2. #2
    Join Date
    Jun 2003
    Posts
    205

    Re: G90 and G91, no difference

    Have you tried putting the G90 or G91 on a line by itself? ... like this :

    G90
    G00 X10.00 Y10.0
    G91
    G00 X10.00 Y10.00

    ... I have seen this resolve the issue many times.

    Chec out our Real World Machine Shop Software at Kentech Inc. - Real World Machine Shop and CNC Software
    Including Conversational CNC Programming Software for Milling & Turning

  3. #3
    Join Date
    Jan 2015
    Posts
    3

    Re: G90 and G91, no difference

    Yes. That gives the same result.

  4. #4
    Join Date
    Mar 2003
    Posts
    2932

    Re: G90 and G91, no difference

    Quote Originally Posted by itbonde View Post
    Hi

    I have a Midwell with FANUC O-M controller.

    In MDI-mode I run:

    G90 G00 X10 Y10

    Instead of moving absolute it's moving incremental, there is no difference if I run with G91.

    Which parameters can affect this?

    Thanks!

    This is from the MDI Operation section of the 0M-C/D manual.

     In MDI operation, the setting (absolute) determines whether the
    commands are absolute or incremental. The G code (G90/G91) is
    ignored.


    So, go to the Settings screen and set Absolute to 0 or 1 depending on which mode you want.

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