Need Help!- thread turning fanuc 10te

[bruiserba]

i am trying to turn a npt 1/2-14 thread using 7/8" stock the code im using is N115 G76 X0.73 Z-0.85 D50 K0.07 I-0.0265 F0.07143 .i keep getting double threads am i doing something wrong can some one help me out the machine is a miyano with fanuc 10te controls. thanks so much for any help.

[Manosteel503]

does that only take single line g76 or can you try double line

[bruiserba]

what do you mean by a double line i dont know.

[dcoupar]

I believe that most Fanuc 10T controls are set up to use a 2-line G76. It would look like:

G00 G97 X0.9829 Z0.2143 S517
G76 P021060 Q20 R0.002
G76 X0.7382 Z-0.5337 R-0.0234 P536 Q80 F0.0714

Have you threaded on this machine before without problems?
What RPM are you running?
Is G97 (CSS Cancel) active?

[CNCRim]

remove D50 then it should work.

[dcoupar]

Originally Posted by CNCRim remove D50 then it should work.

D50 is the depth of first pass. It's required for a 1-block G76.

[bruiserba]

dcoupar would you post a sample prog using that double line so ill know what numbers goes in the p's and q's id like to try it .we never have cut threads before on this machine rpm 1000 were using g97 thanks for the help.

[dcoupar]

The sample I posted earlier should be close. Here's an explanation.

[sinha_nsit]

What you mean by double threads: double-start or double pitch or something else?

Possibly, you are calling G76 twice, with different tools/rpm/start-point.

[bruiserba]

what i mean by double threads is it looks like the lead dont repeat .when it makes a second pass it dont stay in same groove .

[sinha_nsit]

The subsequent threading passes automatically shift laterally by required amount, such that only one side of the tool cuts the groove. This happens in roughing passes. Finishing passes do not shift laterally.

If, due to some reason, you do not want a shift in roughing passes, replace 60 by 00, in the P-word (first block of G76).