Help with ID threads

[juxtoposed]

I am trying to cut 1"-24 ID threads that are 1.250 deep. I keep chiping the tip of the insert on the curly chip build up in the tube. I need some input from some of you about what to try. I feel like the last couple of passes need to be even finer than they are now. Here is the code I am using:

t404;
G54;
G97 S500 M03;
G00 X0.906 ;
Z0.125 ;
G04 P1. ;
M23 ;
G76 X1. Z-1.25 K0.042 I0. D0.0001 f0.0417 ;
G00 X0.906 Z10. ;
M30 ;
;

Can you tell me what the K,I,X, are in the G76?
can you make a suggestion of something to try?

Oh the material is 4130 seamless tubing.

Thanks
Leroy

[wms]

Leroy,

I cut a ton of 4130N tube..threading ID and OD with cross hole in the thread area.

Get some Iscar threading inserts..full profile..Grade IC908..that should fix it..it did for us..

[juxtoposed]

I don't know alot about the inserts, I do know what I have. I am useing a Valenite #TMPC 32 NV-10 VN5. Will the insert that you Quoted me fit in the holder that I am useing or will I need a new one?

Thanks
Leroy

[wms]

Here is code from a 1.250 x 16 thread we use..hope it helps..

G97 S1200 M3
T1212
G0 Z0.050 /M8
X1.260
G76 P010060 Q0004 R0005
G76 X1.1733 Z-0.800 R0 P0384 Q001 F0.0625
G0 G30 U0.0 W0.0
M01

So we use 1 finish pass of .0005
Min depth of cut is .001
plus we are running at 1200 rpm..for a 1.250 diameter..

[wms]

Originally Posted by juxtoposed I don't know alot about the inserts, I do know what I have. I am useing a Valenite #TMPC 32 NV-10 VN5. Will the insert that you Quoted me fit in the holder that I am useing or will I need a new one? Thanks Leroy

Sorry no idea..

[juxtoposed]

Is there a way to make it do the last couple of passes twice on a G76 cycle?

[wms]

Not sure on a Haas...Doesn't look like it from the CD..

On a Fanuc two line G76, it is the first set (XXoooo) of the P block..IE: P050060 would be five finish passes..