G76 on a fanuc oi control

Thread: G76 on a fanuc oi control

1. 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

2. 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
'R is for tapered threading difference in X from start to finish in Z

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