G76 on a fanuc oi control


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    Default G76 on a fanuc oi control

    I am trying to put a helical groove in a transmission bushing on our new machine and the book is not much help, it doesn't give examples and leaves out information.

    G76 P(m) (r) (a) Q(dmin) R(d)
    G76 X(U)_Z(W)_R(I) P(k) Q(d) F(L)

    can somebody explain these to me so that I can understand them. I can provide more information if you could PM me. thank you very much in advance

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    Registered Karl_T's Avatar
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    my cheat sheet


    '*******TWO LINE FANUC G76 INSTRUCTIONS*********************

    'NOTE: Use G0,G1 to position machine at start of thread(Z) and retract height(X) before G76 lines.
    ' Important: X position determines ID or OD threads


    'EXAMPLE G76 LINE 1 FOR 1/2" ROD 20 TPI
    'G76 P011060 Q50 R10
    'first two digits after P number of finish cut passes
    'second two digits after P number of leads to pull out/10, 10 is 1 lead
    'third two digits after P is tool tip angle, tool will infeed at 1/2 this angle
    'Q is minimum DOC cut in tenths, example 50= .0050 depth radius
    'R is DOC finish passes in tenths
    'S is optional spindle speed, spindle must be running with an earlier M3 M4 code

    'EXAMPLE G76 line two 1/2" rod 20 TPI .5" long 1 thou taper (Z 0 at start of thread)
    'G76 Z-.5 X.4567 P433 Q100 F.05 R.001
    'Z is end of thread Z value
    'X is final diameter of thread value; minor dia. on O.D., major dia. on I.D. (LH) threads
    'P is thread height in tenths, 433 is .0433 high, generally COS(infeed angle)*1/thread pitch
    'Q is depth of cut for first cut in tenths
    'F is feed per thread, 1/LEAD for US
    'R is for tapered threading difference in X from start to finish in Z



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    CNC Manual - Read & Download CNC Machine Manuals without Limits on any device
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G76 on a fanuc oi control
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