Time to make some threads

ChrisJ

Due to issues with burrs on the last units we made I'm going to be milling some female 1/8" NPT threads in 316SS soon.

The things I like about thread milling is if a break the threadmill off it simply falls out of the hole.  I can also adjust it so my threads fit a specific part perfectly with little to no slop.  When done right and compared I feel it makes tapped threads feel pretty terrible.


This will be my first time doing NPT threads with one.

mattmia2

So does the part need to rotate and move up and down the pitch of the thread as it rotates?

ChrisJ

mattmia2 said:

So does the part need to rotate and move up and down the pitch of the thread as it rotates?

On my machine the part moves in X and Y and the tool spins and moves in Z (vertical).

I'm going to try and take a video of it in the next few days.

I've done a lot of normal threads but this will be my first time milling npt threads

ratio

ChrisJ said:

On my machine the part moves in X and Y and the tool spins and moves in Z (vertical).

I'm going to try and take a video of it in the next few days.

I've done a lot of normal threads but this will be my first time milling npt threads

Does that mean that the tool rotates around the work, or am I misunderstanding?

ChrisJ

ratio said:

On my machine the part moves in X and Y and the tool spins and moves in Z (vertical).

I'm going to try and take a video of it in the next few days.

I've done a lot of normal threads but this will be my first time milling npt threads

Does that mean that the tool rotates around the work, or am I misunderstanding?

The tool spins like a drill bit and moves up and down and the part  moves around horizontally.

ChrisJ

This video shows how it works.

https://youtu.be/rDnavOlGcdc

ratio

That's awesome. Do you use it to make male threads too?

ChrisJ

ratio said:

That's awesome. Do you use it to make male threads too?

Yessir.

hot_rod

great animation!

mattmia2

without a cnc mill you would need a mill that was pretty much just built for thread cutting.

Lard

I have been using a high-performance two-flute PCD (diamond) threadmill at work.  M24x1.25 inside threads in aluminum in about one second.  18,000 RPM and .3mm/rev (automotive left the inch system long long ago) Up to this point all I have used is been plain ‘ol Emuge carbide.

Love the remark about how a broken threadmill just falls out. The threads are still usually junk, but broken taps=sadness.  Broken spindles = even more sadness.  G0 does not a G1 make.

EdTheHeaterMan

I really enjoyed reading this THREAD! or is this a POST? maybe a discussion?

I'll call it a Thread, mainly for the content