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IndustryArena Forum > Mechanical Engineering > Linear and Rotary Motion > Mitsubishi VMC with Fanuc Series 21M
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  1. #1
    Join Date
    Dec 2006
    Posts
    310

    Mitsubishi VMC with Fanuc Series 21M

    Dear Sirs

    Recently we have replaced X axis ballscrew with new one and since then we are finding hole size variation in the job (Tolerance is upto 30 microns). Backlash values are almost negligible for all three axes ie +/-1

    We are doubting pitch of new ballscrew and may be there is difference of about few microns between old and new ballscrews, which we need to compensate

    Kindly let us know how to give compensation for change in ballscrew pitch

    Warm Regards

  2. #2
    Join Date
    Jun 2010
    Posts
    4252

    Re: Mitsubishi VMC with Fanuc Series 21M

    Function Config / Screw Mapping

    But also check whether you have an imperial or metric leadscrew.

    Cheers
    Roger

  3. #3
    Join Date
    Dec 2006
    Posts
    310

    Re: Mitsubishi VMC with Fanuc Series 21M

    Thanks
    We are using metric ballscrew having pitch of 5mm
    Please explain what u meant by Function Config/Screw mapping

  4. #4
    Join Date
    Jun 2010
    Posts
    4252

    Re: Mitsubishi VMC with Fanuc Series 21M

    Apologies!
    I was assuming you are running Mach3.

    Doesn't your Fanuc have 'screw mapping'? I don't know how the Fanuc stuff is calibrated.

    Mind you, I would still be looking at the quality of the ball screw and ball nut, and the bearings. 30 microns is a lot of error.

    Cheers
    Roger

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