[Pridefull]

Greetings

Could someone please explain how to calculate values for npt thread and for preparation hole.

I need to make 1 1/2 internal npt thread lenght of the thread would be 32 mm and i would like to start 5mm in front of the part.

I am using a fanuc controler with 2 line g76 code

Thanks in advance

[metlshpr]

[sinha_nsit]

In the second block of G76, R = L/32 where L is the total axial movement of the tool. Negative for external and positive for internal, in right-to-left machining.

[Pridefull]

Thanks

for lenghts i figured it out I'm having dificulties calculating major and minor diameter since there is so much limited information on the internet

[metlshpr]

All info can be found in the machinist handbook for the major and minor sizes. The above attachment information was gathered from there.