1/2-14 NPT Programming

[J.R. SWIGER]

Could anyone copy and paste an good example of code for the profile and threading for an external 1/2-14 NPT using the single line G76 cycle? Its for a Haas TL2, .031R turning tool, 60 DEG non-topping threading insert. I don't think the infeed angle (plunge/flank-cut) matters for the numbers I'm after but I could be wrong about that. Sorry if I look like a big dummy but I'm not confident of the numbers I come up with from the dimensions given in the machinist's handbook. Thanks Guys.

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[g-codeguy]

This is for a Fanuc


X.88Z.3
G76X.7479Z-.8285K.0571D150I-.0347F.071429A50.

HTH

EDIT: Oops. Just noticed you also want the profile. This is an old sucker. Hope it is right. Okay, laid it out in MC to double check it.


N200M91 (ROUGH TURN THREAD 1/32R TOOL)
T0202S3000M3
X.9Z.005
G1X.2F.01
Z.02
G0X.85
G1Z-.1
U.02
Z.02F.015
X.6191
X.8289Z-.0849F.01
X.85Z-.4234
Z-.87
X.87
M92
M1

N400M91 (FINISH TURN THREAD 1/64R TOOL)
T0404S3000M3
X.7Z.02
G1Z0F.01
X.25F.003
Z.02F.015
G0X.63
G1X.6451Z.005
Z0F.002
G3X.6748Z-.0062R.021
G1X.8194Z-.0785F.003
X.84Z-.4088F.006
Z-.875F.003
X.86
M92
M1

[hutch07]

½ - 14 NPT Male thread Inch Programming

Thread Pitch 0.07142 Thread Taper 1:16 on Diameter
Thread Height 0.05714” Root Diameter at start 0.6977
Root at finish 0.7485”


T0909 (THREAD)
G90 G00 X1.25 Z0.2
G01 X0.88 Z0.15
G76 P010060
G76 X0.7485 Z-0.812. P0571 R-0.0301 Q0200 F0.07142

[sinha_nsit]

Q and R words in the first block specify min DOC and finishing allowances, respectively.

[g-codeguy]

½ - 14 NPT Male thread Inch Programming

Thread Pitch 0.07142 Thread Taper 1:16 on Diameter
Thread Height 0.05714” Root Diameter at start 0.6977
Root at finish 0.7485”

T0909 (THREAD)
G90 G00 X1.25 Z0.2
G01 X0.88 Z0.15
G76 P010060
G76 X0.7485 Z-0.812. P0571 R-0.0301 Q0200 F0.07142

Wow. Old thread. The example I gave was for a Fanuc control. No Haas in the shop. .15 is a 2 revolution lead. Enough I suppose, but I prefer at least .3. Doubt you will see a difference in cycle time. Using Fanuc G76 for examples, the .02 is a hefty first cut depending on material. If there is no under-cut behind the thread, you might want to consider making this change...P010160 The second 01 will have the insert pulling out at the end of the cut as fast as the machine will allow. A P000029 or P010060 will keep the insert down in the cut for one revolution at the final end point...ringing the thread.. I only use a compound infeed of 60 when having a chatter problem. Normally I use...P000129. I seldom use a spring pass because we almost always deburr the thread and re-thread so I don't need an extra spring pass on the original thread cycle.

If the Haas G76 is the same as a Fanuc G76, you might want to also consider something like this...P000129Q30R.001. As Sinha posted the Q30 clamps DOC at .003 per side once the control's math figures a cut less than .003 DOC. The R.001 makes the final cut at .001 DOC.

For anyone considering programming using Macro B, I can highly recommend Sinha's book.