3" NPT

[csirocky2]

Haas SL20 question
What would the code look like to cut 3" NPT in Aluminum? The piece I am working on needs thread on the chucked side of the part, so I need to reach thru the part to cut them.
Any help would be great!
Thanks

[double a-ron]

If you want the exact code I need more info. 8 tpi? Id or od threads. Longhand using g32 or caned cycle using g76. I used g76, 8tpi, od threads, and the threads on the chucked side as you stated and came up with this:

G76 X2.7372 Z-1.75 I0.0547 K0.0767 D0.015 A30 E0.125


longhand using g32 would look like this:


X3.05
X2.9705
G32 X2.8611 Z-1.7484 E0.125
G00 X3.05
Z-0.0019
X2.9583
G32 X2.8489 Z-1.7519 E0.125
G00 X3.05
Z0.0008
X2.9489
G32 X2.8395 Z-1.7492 E0.125
G00 X3.05
Z-0.0014
X2.941
G32 X2.8316 Z-1.7514 E0.125
G00 X3.05
Z0.0005
X2.934
G32 X2.8246 Z-1.7495 E0.125
G00 X3.05
Z-0.0013
X2.9277
G32 X2.8183 Z-1.7513 E0.125
G00 X3.05
Z0.0004
X2.9219
G32 X2.8125 Z-1.7496 E0.125
G00 X3.05
Z-0.0011
X2.9165
G32 X2.8072 Z-1.7511 E0.125
G00 X3.05
Z0.0003
X2.9115
G32 X2.8021 Z-1.7497 E0.125
G00 X3.05
Z-0.0011
X2.9067
G32 X2.7973 Z-1.7511 E0.125
G00 X3.05
Z0.0002
X2.9021
G32 X2.7927 Z-1.7498 E0.125
G00 X3.05
Z-0.001
X2.8978
G32 X2.7884 Z-1.751 E0.125
G00 X3.05
Z0.0002
X2.8936
G32 X2.7842 Z-1.7498 E0.125
G00 X3.05
Z-0.001
X2.8896
G32 X2.7802 Z-1.751 E0.125
G00 X3.05
Z0.0001
X2.8857
G32 X2.7763 Z-1.7499 E0.125
G00 X3.05
Z-0.0009
X2.882
G32 X2.7726 Z-1.7509 E0.125
G00 X3.05
Z0.0001
X2.8783
G32 X2.7689 Z-1.7499 E0.125
G00 X3.05
Z-0.0009
X2.8748
G32 X2.7654 Z-1.7509 E0.125
G00 X3.05
Z0.0001
X2.8714
G32 X2.762 Z-1.7499 E0.125
G00 X3.05
Z-0.0009
X2.868
G32 X2.7586 Z-1.7509 E0.125
G00 X3.05
Z0.0001
X2.8648
G32 X2.7554 Z-1.7499 E0.125
G00 X3.05
Z-0.0008
X2.8616
G32 X2.7522 Z-1.7508 E0.125
G00 X3.05
Z0.
X2.8585
G32 X2.7491 Z-1.75 E0.125
G00 X3.05
Z-0.0008
X2.8554
G32 X2.746 Z-1.7508 E0.125
G00 X3.05
Z0.
X2.8524
G32 X2.7431 Z-1.75 E0.125
G00 X3.05
Z-0.0008
X2.8495
G32 X2.7401 Z-1.7508 E0.125
G00 X3.05
Z0.
X2.8466
G32 X2.7373 Z-1.75 E0.125
G00 X3.05


Just so you know, I did not create any of that code by hand, I used cam software.

[csirocky2]

Thanks for the post.

The part needs 3" NPT - 8 tpi, these are internal threads. As I look at the machine, I am chucking on the left side of the part and the threads need to be on the inside on the left side of the part. Make sense? The threads are not on the face of the part, but on the back side.