[BAD DOG]

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

[littlerob]

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

[Karl_T]

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.