Multi Pitch Threads?
Multi Pitch Threads?
(OP)
Hi all,
I'm not a machinist or even an engineer but i've gotten involved in a project where I am reproducing a vintage pen. I need to tap the threads where the barrel and the cap screw together and found that it has 4 starting points for the beginning and end of the thread. I'm not sure what this is called or how to do it. The pen that I am creating is going to be cast in sterling silver and I was hoping to re-tap/die the threads like the original. are there companies that make this sort of tool? Should I just tap it to something standard?
I appreciate your help.
SerialCoder
I'm not a machinist or even an engineer but i've gotten involved in a project where I am reproducing a vintage pen. I need to tap the threads where the barrel and the cap screw together and found that it has 4 starting points for the beginning and end of the thread. I'm not sure what this is called or how to do it. The pen that I am creating is going to be cast in sterling silver and I was hoping to re-tap/die the threads like the original. are there companies that make this sort of tool? Should I just tap it to something standard?
I appreciate your help.
SerialCoder





RE: Multi Pitch Threads?
I'd recommend you find an old machinist which is real proud of doing exceptional quality work. Have him make your parts on a good quality engine lathe. If you are going to make several/many of these vintage pens then spend the money on the tooling.
My thoughts,
Bill
RE: Multi Pitch Threads?
I'll be doing at least 10 of these so it looks like i'll be going the tooling route. So there are companies that can make / match a particular thread then?
Thanks for your input.
Dave
RE: Multi Pitch Threads?
Yes, there are people who can do this. It is not that rare. The formed multiple thread on a plastic pill bottle or a screw top tin are very similar.
Multi pitch threads are somewhat different however. These have two different pitches at different areas along the length of the screw. I've seen them used in bone screws to increase the pull with which two pieces of bone can be pulled together(At least that's what the podiatrist said).
Most any competent tool maker should be able to do this.
Griffy
RE: Multi Pitch Threads?
RE: Multi Pitch Threads?
RE: Multi Pitch Threads?
http://www.ocmfg.com/western.htm
RE: Multi Pitch Threads?
RE: Multi Pitch Threads?
http://www.e-taps.com/