1/8-27 NPT TAP, ...mc 2018

[Thee Rickster ™]

Good Day

I dont do alot of tapping unless it is a 1/4-20 or 3/8-16 or 1/2-13, tapped holes in my molds.

i need to tap a 1/8-27 npt but i can not find npt taps in the(mil_inch) or ( bigmill_inch) libraries.

 

So i called up the closest pitch in the library, 1/4-28 hoping there is some way to edit it to the tap i need.

but there is no way to edit the 28 pitch to 27, so i assume it will strip the threads.

Can someone explain how i can do this or send me a saved (.mcam-operations) file that i can import into my tool group?

 

Any help will be greatly appreciated

Rick

[Colin Gilchrist]

Have you tried creating a new Tap from scratch? I believe you can enter the pitch or threads per inch when you do...

[Manofwar]

Open up the tool manager and right click on the 1/4-28, edit tool, avoid setting a standard size and instead type in .125 in the Nominal diameter field and 27 in the threads per inch field. Adjust the rest of the tool if you want, but these two edits should make the tool work as you need.

[The Chipmaker]

 Start from scratch here is an excel program to use for pitch, tpi and rpm

tap.xlsx