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Getting a tacho drive fixed on a classic racing bike

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arnoldb:
Bogs,Great job, and thank you very much for the step-by-step on the silver soldering  :bow:

It is most inspiring to follow your reasoning behind each of the steps involved and then the execution; reminds me of playing a good game of chess.

Regards, Arnold

sbwhart:
John

If the thread you've got to cut is 1/2 BSF I've got a die, or must it be thread cut.

Cheers

Stew

bogstandard:
Stew,

Because the nut has to be perfectly accurate for it to match up to the shaft end I have just done, a die cut thread will just not be accurate enough. It only has to be the smallest amount out of square, and the runout on the end of the nut drive will break the end off the new shaft. As it is, I will be allowing a couple of thou free play in the slot which has yet to be cut.

But I will still borrow it if you don't mind, any slight innacuracy in the thread pitch can be put right using the final threading cut of a die.

John

John Stevenson:
Oh nostalgia, things aren't what they used to be.

I used to make these for Manx Nortons and AJS 7R's years ago, there were 4 main types 1:1 right hand and left hand rotation and the same in 2:1.
There were others but these were the popular ones.

Ironically a few weeks ago whilst sorting out Tardis No 3 I found 10 bare casting in bronze for these.
There is about 3 odd gears in a drawer in one of the toolmaker cabinets but all the jigs and drawings are missing.
Cable end was 1/2 x 26 cycle, can remember that.
If I could have found the drawings I was going to put them on Ebay, one casting with drawings.

John S.

bogstandard:
John,

In the old days you could do things like this, wack it on and try it out. Didn't matter where it came from, if it worked, great, if not, try something else.

What you have got must be like rocking horse s**t by now. I would stick them on ebay anyway, someone who has a broken one will soon learn how to machine it, by using the old one as an example.

Mechanical things are now out of the door, it's all electroconical now.

Bogs

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