1/2-14 Npt Id G Code

[pmw]

Need to cut 1/2-14 npt ID in ss316 would like to use g76 I have fanuc ot control

G76 p ? 010160 Q? R?

G76 X.? Z-.? R.? P.? Q? F=.0714

CAN ANY BODY HELP WITH THE ? or do you have a good program is the taper 1.333. Can you explane the p(01)(01)(60)on first G76 line. thanks

[cogsman1]

Hope this does it for you.

(TURN_TO)
(X.8022)
(X.84W.6062(or A1.78333))

T0101G97S980
G0X.9355Z.05
G4U.5
G76P010015Q.003R.001
G76X.7479Z.5337P.0438Q.013F.07142R-.0182
G0X.9355



The first G76 isn't needed but is recommended.
- G76 P Q R

P010010 sets 3 things
- first 2 digits is the amount of finish passes - 01

- second 2 digits is % of the lead or pullout exiting the thread- 00
00 = almost no angle at pullout and 99 = 9.9 leads away start out

- third 2 digits are the angle of infeed - 10
0-99 are usable

Q.002 sets the minimum cut amount during threading

R.0005 sets the cut amount of the last pass

The second G76 cuts the thread.
-G76 X.1876 Z.3 P.0302 Q.01 F.05 (R-.002) FOR 1/4-20

X.1876 =Minor Dia. of thread

Z.3 or (W) =The ending Z of the thread

P.0302 =Height of thread in radius (Maj-Min)/2

Q.01 =Amount of the first cut. All the rest of the cuts are calculated.

F.05 =Feed-rate 20 TPI 1/20=.05

R = R is optional for tapered threading. R is the amount of
difference in X from start to finish in Z. When cutting threads
moving Z and X in a positive direction R is a negative value.