1.5 X 11.5 TPI NPTF THREAD

[TonyL]

Hello,

 

I have never been able to use Mastercam for pipe threads and once again have run into a situation where the program from one of our tooling supliers will not work either.

 

The part has a 1.5 dia. x 11.5 TPI NPTF thread about 13 inches down in the part. I made the first three prototypes with a standard 5 flute helical thread mill but could not get the chatter out of the threads.

 

Tooling guys want to try to a single point insert in a long anti-vibe lathe bore bar. The reason I normally cant use Mastercam to make tapered pipe threads is it will not break up arcs in quadrants, even after changing the breakarcs setting in the post. I did post out some code for a single point tool and still get acrs broken in 180 degree arcs instead of 90 degrees.

 

Is there a setting I am missing in the post or is it not possible to output arcs in quadrants with a threadmill toolpath?

 

TIA,

 

Tony

[DavidB]

Tony

What version of MC are you using?

 

Thads Sticky

[TonyL]

X2

[DavidB]

In the control def have you get this?

 

quote:

---

The reason I normally cant use Mastercam to make tapered pipe threads is it will not break up arcs in quadrants,

---

Doing thread milling will create arcs in the XZ plane because it is a helix, can your machine do this?

 

It works here.

code:

---

 (T18  - 16 ENDMILL  6 FLUTES - H18  - D18  - D16.000mm)

G00 G17 G21 G40 G80 G90

G91 G28 Z0.

(TOOLPLANE NAME - FRONT)

T18 M06 (16 ENDMILL 6 FLUTES)

M97

M56 H1 D2

M11 (UNLOCK)

G00 G17 G90 G54 B0. X0. Y0. S1400 M03

M10 (LOCK)

G43 H1 Z25.

Z10.

G94 G01 Z-25. F500.

Y-5.8 F700.

G03 X3.843 Y-6.958 Z-24.843 I3.843 J5.8

X10.8 Y0. Z-24.423 J6.958

X0. Y10.8 Z-23.846 I-10.8

X-10.8 Y0. Z-23.269 J-10.8

X0. Y-10.8 Z-22.691 I10.8

X10.8 Y0. Z-22.114 J10.8

X0. Y10.8 Z-21.537 I-10.8

X-10.8 Y0. Z-20.959 J-10.8

X0. Y-10.8 Z-20.382 I10.8

X10.8 Y0. Z-19.805 J10.8

X0. Y10.8 Z-19.227 I-10.8

X-10.8 Y0. Z-18.65 J-10.8

---

[TonyL]

I will check my control definition for those settings. Do you have anything changed in your post as well? Our machines are capable of x/z helical interpolation so if I can get the code we shoulb be in business.

 

Thanks,

 

Tony