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Magneto Shaft Hirth Couplings


andypugh

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I have recently taken on the job of replacing some parts of the magneto coupling on the Imperial College fire engine. 
We think that the original parts were lost by Dennis, some time in the 1960s....

Anyway, there was originally a coupling with 7 teeth on one side and 8 (or maybe 6) on the other to allow for adjustment, a coarser version of the 19/20 Simms couplings with the rubber disc. 

The teeth appear to be 30 degrees included angle, and I was wondering how to cut them when I remembered a curious cutter in my dad's collection that we had never found a use for. And it turned out to be perfect for the job. 

So, if anyone with a White and Poppe engine is short a Hirth coupling or two (the steel part in the photo) drop me a message, I can make them. 

(I also made the Simms style part that it connects to, but those are relatively easily obtained) 

CD32B469-EB19-41B7-82FE-AC1CA346A28B.jpeg

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