Programming a 1/2 NPTF pipe thread

[nussie08]

Hi I am trying to program a 1/2-14 NPTF pipe thread and a 3/4-14 NPTF pipe thread using a single point threading tool. I am trying to figure out the angle and hole size I need to do this. Does anybody know?

 

Thank you!

[crazy^millman]

Here is what Google turned up.

 

http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html

 

HTH(Hope That Helps)

[Machineguy]

ID or OD ? There are single point inserts for pipe threads !

 

Machineguy

[nussie08]

It is an I.D hole.

 

Thanks Crazy Millman I will look at it.

[crazy^millman]

20 odd years ago I cut my 1st mill threads doing that very thing. I would look to a full profile tool to cut these threads, verse doing it single point. The angles, the root and the PD will all be of a much better quality using a full profile tool verse a single point. With a single point you must prep the hole correctly. That is machine the ID to the correct angle and size. That will require either a ball checked to a depth with a depth mic. With the correct threadmill you go to the minor diameter threadmill and done.

 

HTH

[JAMMAN]

I use a threadmill toolpath with a 1.8 degree taper angle in cut parameters. Works like a charm.

I use a double 60degree bevel cutter too instead of a threadmill tool. Fraction of the cost, works as well.

[Matthew Hajicek - Singularity]

[crjensen]

COULD YOU MAKE THAT THREAD MILL SHEET FOR US OTHER USERS TO DOWNLOAD?

[JAMMAN]

Do I see a .ods extension? Cool

 

It will save in XLS format too, and reads XLS just fine.

[Matthew Hajicek - Singularity]

Ok, I put it on the FTP both as ODS and XLS, under "/Mastercam_forum/Tools".

 

Here's what I do with it: