BIG DEBATE IN SHOP,,,,, I NEED AN EXAMPLE OF A G76 CYCLE FOR A 1/4-18 NPT.

3 GUYS HAVE 3 DIFFERENT METHODS OF USING THAT CYCLE.

MITSUBISHI CONTROLLER

THANKS.

BAD DOG

I would P.M. Geof or APP, sorry I'm not much help. Robert

I'll let you do the math on all the points. here's an instruction sheet for my control.

'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
-----G76

The G0 or G1 move just before is important also. It determines start Z for thread and return plane, X, for next pass.