Newbie Multiple C-axis offsets?


Results 1 to 5 of 5

Thread: Multiple C-axis offsets?

  1. #1
    Registered
    Join Date
    Sep 2008
    Location
    canada
    Posts
    22
    Downloads
    0
    Uploads
    0

    Default Multiple C-axis offsets?

    I am using a Daewoo Puma 240M with live tooling and fanuc 21-i control, I have to machine 3 identical shapes spaced equally on the outside of a part. I have programmed it once and I am wondering how to do the other 2 shapes.
    I would like to use the C-axis (chuck) workshift to accomplish this.I would like to machine my first shape using g54 with the c axis offset set at 0, go home load g55 which has a c-axis offset of 120° Run the same code which has just been copied and pasted and then go home load g56 with a c offset of 240 and then run the code again. In the past i tried something similar and didn't have any luck. The machine did not take the C offset into consideration. I have done parts using this technique by offsetting the Z axis in g54 and g55 to be able to do 2 parts in a row and it worked fine. I know that if necessary i can just add 120° to each move in the program for the 2nd shape but there has got to be a better way.
    Any suggestions would be great.

    Brad

    Similar Threads:


  2. #2
    Member dcoupar's Avatar
    Join Date
    Mar 2003
    Location
    USA
    Posts
    2932
    Downloads
    0
    Uploads
    0

    Default

    Have you tried using G50 to set your C position?

    G28 H0
    G50 C0
    (run 1st shape)
    G28 H0
    G50 C120.
    (run 2nd shape)
    G28 H0
    G50 C240.
    (run 3rd shape)



  3. #3
    Registered
    Join Date
    Apr 2006
    Location
    Australia
    Posts
    5
    Downloads
    0
    Uploads
    0

    Default

    Or, why dont you program the shape in a sub-program

    and then call your 3 postions and just call the sub-program 3 times....


    Save you the hassle of inputting the code 3 times over.....



  4. #4
    Registered
    Join Date
    Jun 2008
    Location
    United States
    Posts
    1511
    Downloads
    0
    Uploads
    0

    Default

    There are many different ways that you can approach this to make it better. I would personally use variables to track and adjust were the C-position is and keep adjusting and setting the G55 C-axis variable as you go until you cut all 3 pcs. This would also give you the ability to start at whatever piece that you wanted in case you have to ditch the program after you have already done 1 or 2 pcs.

    However the easiest way to set it up for now would be to use as Dcoupar has stated by shifting the C-axis via G50 command. Or if you insist on using G54,G55,G56 for your 3 parts you could make your routine to cut the parts a sub program like ScoobRs said. Say your sub is program 1000 you then make your main program as follows.

    O1234
    G54M98P1000
    G55M98P1000
    G56M98P1000
    M30

    Stevo



  5. #5
    Registered
    Join Date
    Sep 2008
    Location
    canada
    Posts
    22
    Downloads
    0
    Uploads
    0

    Default

    Thanks for the help. I ended up using the G50, it worked perfectly.



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

Multiple C-axis offsets?

Multiple C-axis offsets?