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  1. #1
    Join Date
    Nov 2006
    Posts
    11

    Okuma OSP Tapping Cycle

    Hello, we have an Okuma OSP 500-LG Lathe. I am trying to program a tapping cycle for a 1/4-20 tap. I am not much of a G Code programmer and for the most part use Virtual Gibbs when programming. Our post doesn't seem to work. When it comes to special operations like this we change the program manually. The manual is old and the pages containting this information have been lost . Your help is greatly apreciated.
    Barry

  2. #2
    Join Date
    Jun 2008
    Posts
    1511
    can you post the code that is not working?

    Stevo

  3. #3
    Join Date
    Nov 2006
    Posts
    11
    I will see what I can do. You probably won't see anything from me until sometime Thursday afternoon. Thanks for the response.
    Barry

  4. #4
    Join Date
    Aug 2008
    Posts
    62
    Example 20 T.P.I.

    (Right Hand)
    G0G95G97X30.Z30.S375T0101M42M3M8
    X0.0Z1.1
    Z.25
    G77X0.0Z-.5F.05
    G0Z1.1
    X30.Z30.M9
    M1


    (Left Hand)
    G0G95G97X30.Z30.S375T0101M42M4M8
    X0.0Z1.1
    Z.25
    G78X0.0Z-.5F.05
    G0Z1.1
    X30.Z30.M9
    M1

  5. #5
    Join Date
    Nov 2006
    Posts
    11
    I did try the program that thawk32 offered. At G77 my machine gives me "G" code unavailable error. Is it possible my machine will not tap?
    Barry

  6. #6
    Join Date
    Feb 2009
    Posts
    6028
    I will for sure not rigid tap. Should be a floating tap cycle available, but the 500 was kind of a striped down 5000. I'll see what I can dig up.

  7. #7
    Join Date
    Feb 2009
    Posts
    6028
    No tap cycle listed other than G77. Think you will need to program it using G1 and a proper feed in inches per rev. Remember to use a floating holder.

  8. #8
    Join Date
    Nov 2006
    Posts
    11
    I do have a tap holder that appears to move under tension. Does this program look like it would work for a 1/4 20 tap. I realize that the tap will have move under tension as it completes the cycle. I have seen others on this web site talk about 5 or 10 percent less than then greater than the pitch of the tap. What do you think about this program? Thank you.
    Barry

    (Right Hand)
    G0G95G97X30.Z30.S375T0101M42M3M8
    X0.0Z.25
    G1Z-.5F.045
    M5
    G1Z.25F.055M4
    M5
    X30.Z30.M9
    M1

  9. #9
    Join Date
    Aug 2008
    Posts
    62
    Pyro,
    Yes that should work. I think I would probably feed out at the correct pitch (.050) instead of .055. Make sure you leave the feedrate override at 100%.
    Another thing, if your machine will accept M161, this will fix your feedrate at 100% no matter what the feedrate override is set on. M160 cancels M161.

    Rick

  10. #10
    Join Date
    Feb 2009
    Posts
    6028
    Should work fine. I agree withThawk53 on the M code and feed.

  11. #11
    Join Date
    Nov 2006
    Posts
    11
    Thanks for the help. It will be a few days before I can try the program. I will let you know how it goes.
    Barry

  12. #12
    Join Date
    Nov 2006
    Posts
    11

    Thank you

    Thanks to everyone for the help. I was able to tap an M3 by .5 hole about .65 deep with a forming tap in aluminum. So far things are working great, thanks again.
    Barry

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