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  1. #1
    Join Date
    Nov 2005
    Posts
    8

    fanuc gn6 contol on a warner & swasey sc-17

    is there a parameter that will help my problem ?

    I cut an 8" bore and it is to size then when I cut a 16" bore it is +.01

    i know that i can use the offset to make it right,but is there a parameter that can change the gain on the servo or something to correct this ?

    Thanks David

  2. #2
    Join Date
    Apr 2005
    Posts
    629
    Quote Originally Posted by DavidC1949
    is there a parameter that will help my problem ?

    I cut an 8" bore and it is to size then when I cut a 16" bore it is +.01

    i know that i can use the offset to make it right,but is there a parameter that can change the gain on the servo or something to correct this ?

    Thanks David

    Hi David, that is a pretty strange problem. I don't know the proper solution, but I would check the mechanicals of the machine, slop in the ways or perhaps a really worn ball screw. There are parameters for dealing with pitch error on the ball screws - I believe they are called pitch error comp. I have no idea on how to set them though -sorry.

    Chris

  3. #3
    Join Date
    Jun 2005
    Posts
    22
    Hi David,
    In the Fanuc manual it explains how to set the ratio of measurment to distance moved.
    It is done on initial machine build and would be unusual for this to need changing as its not something that would normally need tampering with.
    Unless someone has tried to adjust these to take up wear on the machine(also doubtful).
    The pitch error is easy to change and is explained fully in the fanuc manual.
    Have read it but never done it!
    Hope this helps, John.

  4. #4
    Join Date
    Sep 2005
    Posts
    767

    Position error in X

    David, This may be a silly question, but ... Is your tool on center ?

    The pitch error compmensation in the system 6 is easy to adjust, but I just can't believe that there's .0100 error between and 8 inch bore and a 16 inch bore. That's only a 4 inch difference along the X axis ballscrew. There must be some other factor here ...

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