[koola]

I need to thread an inner diameter as shown in the attached picture.
The problem is that the start and end diameter is different (conic) and need to produce quite a lot of this part. is there another way to threads this?? i can use the lathe but i need to mass produce this part. is there a ways to speed up the process? perhaps taps that go at an angle ? Thanks

[PixMan]

You haven't specified just what thread spec is required. Is this a standard NPT (pipe) thread, or a metric version of a pipe thread?

Your best bet mill be to use a tap if you don't have a CNC machine or a manual machine with a taper attachment.

Tell us what the thread specification is, what machine you have, and we can better help you.

[Superman]

The core size nearly looks like a 1/2" BSPT ( British Standard Pipe Taper )
But you still have to verify with the customer what he wants to fit into the part

"G: Series British Standard Pipe - Parallel ( Straight ) BSP or BSPF
Also referred to as British Gas, British Pipe Parallel or Parallel Fastening thread.
Various Symbols: BSP, BSPP, BSSPI, BSPF, BSPG, PS, R, G.
Taps Marked " G Size I.S.O."
------------------------------------------
"Rc: Series British Standard Pipe - Taper- BSPT
Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread.
Taper is 3/4" taper per foot ( 1 in 16 on the diameter)
Various Symbols: BSPT, BSPTr, PT, KR, Rc.
Taps Marked " Rc Size I.S.O."

another Reference

[koola]

Sorry guys, i think this picture will give a better idea. I currenty had CNC lathe and normal end mill.

[ctate2000]

Your CNC lathe should have no trouble making a tapered thread with a single point tool.