Need Help! Fanuc 21m Z axis home


Results 1 to 7 of 7

Thread: Fanuc 21m Z axis home

  1. #1
    Member Se5a's Avatar
    Join Date
    Mar 2019
    Posts
    94
    Downloads
    0
    Uploads
    0

    Default Fanuc 21m Z axis home

    So I had the ball screw nuts out of XY and Z to check and clean, X&Y home fine, Z homes into the tool changer clamp, way to high for home.

    I have tried everything I know which isn’t much with no love. I have changed the nut location, works fine until you do a can/P then right back to where it was.

    It’s hitting the decel dog, sometimes it will slow and other times it will continue to travel fast to home.

    Any help will earn you pleasure knowing you have helped out an old guy who’s just getting into his first vmc!




    Sent from my iPhone using Tapatalk

    Similar Threads:


  2. #2
    Member
    Join Date
    Apr 2011
    Location
    USA
    Posts
    841
    Downloads
    0
    Uploads
    0

    Default Re: Fanuc 21m Z axis home

    you can adjust the home position with parameter 1850, or you can try to adjust the home dog, or both.



  3. #3
    Member Se5a's Avatar
    Join Date
    Mar 2019
    Posts
    94
    Downloads
    0
    Uploads
    0

    Default Re: Fanuc 21m Z axis home

    I will change the grid shift (1850) and see what happens. This sets the counter after the decel dog right?


    Sent from my iPhone using Tapatalk



  4. #4
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5716
    Downloads
    0
    Uploads
    0

    Default Re: Fanuc 21m Z axis home

    Is it possible that you disturbed the switch positions or the actuator levers? Maybe the switches are just a bit out of adjustment? Not sure why you would need to change parameters if all of the work done was mechanical.

    Jim Dawson
    Sandy, Oregon, USA


  5. #5
    Member machinehop5's Avatar
    Join Date
    Aug 2009
    Location
    United States
    Posts
    1564
    Downloads
    5
    Uploads
    2

    Default Re: Fanuc 21m Z axis home

    ...possibly did not reassemble in the same position if, your machine has a coupler between Z axis motor and the screw (120 degrees out one way or the other)
    https://ruggedmade.com/lovejoy-l075-...iABEgLUAvD_BwE
    DJ



  6. #6
    Member Se5a's Avatar
    Join Date
    Mar 2019
    Posts
    94
    Downloads
    0
    Uploads
    0

    Default Re: Fanuc 21m Z axis home

    I didn’t take out the z ball screw just supported the spindle then lowered the nut while the motor was locked then back together. I think it got screwed up when I tried to set home with parameter 1815 instructions. I have incremental encoders btw


    Sent from my iPhone using Tapatalk



  7. #7
    Member Se5a's Avatar
    Join Date
    Mar 2019
    Posts
    94
    Downloads
    0
    Uploads
    0

    Default Re: Fanuc 21m Z axis home

    Changing 1850 worked, homes nicely out of the way of ATC And fine tune with the dog too


    Sent from my iPhone using Tapatalk



Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Fanuc 21m Z axis home

Fanuc 21m Z axis home