Thread Chasing

[Ryan]

Has anyone ever tried chasing threads on the celluloid blanks or ebonite with a regular tap and die?

Thanks,
Ryan

 

[btboone]

I've done stuff like that in the past. The trick is to use a fresh sharp tap and keep the plastic extra thick until the area is tapped. It can then be turned to correct thickness. The tap will definitely blow out a thin section surface.

 

[vick]

I have tried it a couple times and not been completely happy with it. I have not done much tapping so it may just be me.

 

[Paul in OKC]

I agree with Bruce, the more material you can leave around the threading area the better.

 

[dfurlano]

Acrylics can be very brittle, ebonite should work better. But you can also try PET (polyethylene), PBT (polyester) and Acetal (delrin) which may work out to be the best materials. Not sure about PVC, Nylon, or Teflon they may not be very dimensionally stable.

Someone once said metals work pretty good.

You should also use dissimilar materials for the mating threaded parts.

 

[jtate]

http://www.hartvilletool.com/product/12104

When making threads in wood working these are the sort of tools normally used. Now, tools of this type that are small enough for pen use... I don't know where you'd get those.

Taps and dies just seem like brute force.

Julia

 

[Johnathan]

The best person to hear from on this will be Anthony. I know he has done a many and they all look pretty nice.

 

[leehljp]

I know you asked about celluloid and ebonite but concerning wood I will pass this along - it is not uncommon to tap threads in hardwoods. Just take it slow and easy. Holds well when done correctly.