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>> The difficulty is comming up with a mechanism which will connect one
>> shaft to another if a third shalf is rotating, and disconnect them
>> when it stops rotating.
>
> Just get a clutch (like the one in a car) that is controlled by a third
> shaft rather than your foot.
Does Lego have a part like that? ;-)
> Sorry I didn't explain very well, my idea was that the gates would only
> update their state when you pushed the rod. It would be like a kind of
> master clock for every gate. You could then have something driving the
> rod back and to, and the gates would all update on each forward push of
> the rod.
...so instead of continuous rotational drive, you have continuous
reciprocating drive, basically?
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