No, it's not a pipe thread; very much steeper taper than a pipe
thread...

One such as I refer to appears in South Bend's handbook, How to Run a
Lathe at p.82. Sorry I have no facilities to upload a scan of the
picture.

Jim Wilkins wrote:
"phaedrus" wrote in message
...
Hi guys,

I've seen pictures of threaded tapers being machined on lathes and
was
wondering what the hell use they are? I mean, since the diameter of
the threaded section is constantly varying, what can it possibly be
screwed into? I cannot imagine any nut or internal thread that would
accommodate such a piece of work.

Kindly disabuse me of my ignorance if you can, thanks.

P.

Please elaborate further. Pipe taps are tapered, and spring winding
mandrels could be mistaken for taps.

jsw