help with threading g76 settings

[panaceabea]

I need a little help writing the the g76 line to thread with yasnac lx3 controller.

I have been lax in learning basic canned cycles as my other 2 turning centers have really easy to use conversational programing and to date I have not needed to know the how and why , just enter a few parameters , maj, minor pitch and depth per pass and cut the threads.

I have spent the day going thru the 4 pages in the manual that relate to g76 and have written the following which is intended to cut .75x20 tpi . Everything appears OK but it cuts the final pass at a depth of .006" , 2 x my D value.

Is there a way to enter a value for depth of finish pass and any way to callout spring passes (multiple finish passes at the final depth)?

T300
M8
G00 X.755 Z.1
G76 X.7 Z-.75 K.025 D.003 A60 F.05
M9
M30

[panaceabea]

is there possibly a parameter or setting that controls the depth of the finish pass?

[dcoupar]

Setting #6206 is the minimum depth of cut. I can't find any reference to spring passes. I believe you have to program these individually. I think the example below would take 2 spring passes since D must be less than K. Try it away from the part 1st.

T300
M8
G00 X.755 Z.1
G76 X.7 Z-.75 K.025 D.003 A60 F.05
G76 X.7 Z-.75 K.025 D.0249 A60 F.05 (2 SPRING PASS)
M9
M30

[panaceabea]

I will give it a run in the morning

[Geof]

If you want absolute control over the depth of cut and as many spring passes as you like use G92.

[panaceabea]

g92 will solve the problem, was just hoping to do it all in one line