On Mon, 8 Jun 2009 13:20:27 -0500, "Robert Swinney"
wrote:

I may be getting a project where it is necessary to machine internal threads in PVC. An threaded
metal cylinder would screw into a 1" ID piece of plastic pipe. Does anyone have experience with
machining PVC ?

Bob Swinney


if you need to do a large number of pieces you could do the job a
little creatively.
you can get pvc soft enough to deform at steam temperatures.
steam the tube and expand slightly using a push in insert.
place the threaded rod in position then squeeze back the pvc.
it should pick up the threads as you press it back.

never attempted this but upvc can be formed into any shape when warm
enough.

Some info on warm forming pvc he
http://billpentz.com/woodworking/cyclone/PVC.cfm

David Merrill

"Stealth Pilot" wrote in message
...

if you need to do a large number of pieces you could do the job a
little creatively.
you can get pvc soft enough to deform at steam temperatures.
steam the tube and expand slightly using a push in insert.
place the threaded rod in position then squeeze back the pvc.
it should pick up the threads as you press it back.

never attempted this but upvc can be formed into any shape when warm
enough.

David Merrill wrote:
Some info on warm forming pvc he
http://billpentz.com/woodworking/cyclone/PVC.cfm

Good link, thanks.