[Vulcan R&D]

I need to create a VERY coarse thread pitch thread in a 1/16" ID. If I could get 1 thread per inch (for example) that would be great. Think of it as an ID version of an auger. Is there any way to do this aside from custom tooling?

[Delw]

depends on your material you are cutting how and how long and how deep the goove/thread. there are many ways to do it, however everything is going to have to be custom UNLESS, you have a old cnc machine and want to do a controlled Crash

[RICHARD ZASTROW]

Sounds more like rifling than threading. Maybe talk to a gunsmith.

Dick Z

[DareBee]

EDM job
Hope you have deep pockets

[Delw]

Sounds more like rifling than threading. Maybe talk to a gunsmith.

Dick Z

Richard
normal rifling only goes down to .177 ie 17 cal. I think someone did a 15cal. a while back.

he could make a guide and have the tool slip in the id of that guide with a pin sticking out "cheap broach"
I wish these guys would answer post when they post a question, or at the very least add in important details like material type length etc etc. big difference between alum and inco as well as a 30" part and a 3/8" long part.


Delw

[Vulcan R&D]

Actually it would be very similar to rifling except that it would need to be a sharp thread like a screw.

The length of the ID would only be 1" long, just one thread spiral preferably, in 303 or 304 stainless. It would be a through hole so I wouldn't have to worry about chip removal.

[morehelium]

Are you serious on the 1/16" ID?

Is that 1/16" on the minor dia. or the major dia.?

A single start thread that small is closer to a straight groove than a thread.

In 304 casting is probably the only way other than EDM due to forces involved in cutting.

What's the application? You might want to consider a straight groove and then actually twisting the piece...

Chris