Crankshaft butchers.

[Tomas]

I'd love to see some photos of that jig.

Not much to it Nathan. It is a 70 mm tall slice of old hydraulic cylinder with 30 mm thick steel plate of 200mm in diameter welded on it turned round and sqare plus some holes in it to set up and bolt half crank and some weights on. You seem to be curious but i am not going to tell you any more. You work out your own way of how to do this. I used very short boring bar to minimise vibrations when machining crank pin hole.
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That's way more complex than what I use. How long does it take to set up a wheel?

Not long since my one was drilled for rm 125 crank the ofcentre hole is 25mmOD so i use a sleve to do the right half crank. once bolted to jig i just pop it in chuck and clock   faces, ID and OD to make sure everything is sqare.

[Tomas]

You not suposed to give away secrets 

[Momus]

It's a secret of common sense Tomas and probably unlikely to upset any commercial undertakings using a similar method.

I posted that for Nathan S to see: he is in my opinion particularly generous with helpful information and had asked.

[TT5 Matt]

well its good to share ideas with fellow vmx's and gives me an idea for making holes in things i dont have big enough drill bits for or even abig enough drill press to take them if i had the drill bits and easy to tweak the chuck to line up the hole ;)another job to make up at the fitting course i do at tafe

[Nathan S]

Thanks Momus.

[Tomas]

I was only joking Momus. It is a prety easy set up to work out even if you have never done such thing before. Happy machining.