Adding sprockets to 28mm acme vice screw

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A wild idea from someone who is quite ignorant in these twin vice setups, why bother gearing them at all, why not use say a V belt and a couple of pullies which would give enough friction to wind in the “other” screw so that you then just had to go over and nip it up,,,which as a guess you might have to anyway with even the most sophisticated setup?
Steve.
 
How about getting 2x single speed bike sprocket and tack welding or chemical metal them to the vice handle castings. Then a 1/8 chain between the two?

If you need the slack taken up you can get a fixed wheel tensioner.

Just a thought.
 
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