I.D. threading Fanuc 18t Hardinge T42

[rwpbrian]

I was wondering if someone could give me some info on how to thread an internal thread on my Hardinge T42 with Funuc 18t
Heres how I would thread an O.D.thread

(THREADING 25mm X 1.5p O.D.Thread)
N1
G97 S650 M13
T101
G0 X1.0506 Z.25
S650
G4 U.6
G76 P030029 Q0025 R.0
G76 X.9054 Z-.500 P0363 Q0040 F.059055
G0 X1.250
Z6.0
M01

What would I change to do the same thread internally?
Thanks
Brian

[angelw]

Originally Posted by rwpbrian I was wondering if someone could give me some info on how to thread an internal thread on my Hardinge T42 with Funuc 18t Heres how I would thread an O.D.thread (THREADING 25mm X 1.5p O.D.Thread) N1 G97 S650 M13 T101 G0 X1.0506 Z.25 S650 G4 U.6 G76 P030029 Q0025 R.0 G76 X.9054 Z-.500 P0363 Q0040 F.059055 G0 X1.250 Z6.0 M01 What would I change to do the same thread internally? Thanks Brian

Hi Brian,
G0 X1.0506 Z.25 - Specify an X value that is smaller than the Minor Diameter of the thread.
S650 - This is not required, you've already started the spindle
G4 U.6 - Why the Dwell here?
G76 P030029 Q0025 R.0
G76 X.9054 Z-.500 P0363 Q0040 F.059055 - Specify an X value equal to the Major Diameter of the internal thread.


G76 P030029 Q0025 R.0

With regards to the argument shown in Red above, this is generally set to the included angle (Tip Angle) of the thread. Either:
1. the thread angle is 29 degrees,
2. you inadvertently specified 29 degrees when the thread angle is 60 degrees,
or
3. you purposely specified 29 degrees when the thread angle is 60 degrees.

If 3, that's not an altogether bad thing. It just means that more work is being done by the leading edge of the tool, and some by the trailing edge. I often do this but use 55 instead of 60, so that most of the work is being done by the leading edge.


Regards,

Bill

[rwpbrian]

Thanks Bill works great!

Also I was wondering if you had any knowledge of programming live tooling with the Fanuc 18t maybe i can run a couple things past you if you dont mind?

Thanks Brian

[angelw]

Originally Posted by rwpbrian Thanks Bill works great! Also I was wondering if you had any knowledge of programming live tooling with the Fanuc 18t maybe i can run a couple things past you if you dont mind? Thanks Brian

Hi Brian,

Thanks for the feed back. I'm sure there are others that follow the Threads, excuse the pun, and gain by knowing that the answer to the question worked, or just as importantly, didn't work.

I'm sure I, or many other Forum members will be able to help you with other questions regarding live tooling. However, start another Thread with a title that relates to the question.

Regards,

Bill