On Fri, 15 Jul 2005, Gerhard Fiedler wrote:

> Dwayne Reid wrote:
>
>> I'm sure this has been suggested before, but why not consider a
>> servo?  There are some pretty hefty units rated for industrial duty
>> available.  May even be less expensive than the solenoids.
>
> It is probably. Less expensive and smaller. I just didn't find anything
> that "out of the box" fits my requirements. I'll probably do it with a
> motor and some gears to it; mainly a matter of finding the right stuff.

You could use a malta cross mechanism to do the movement. This allows 
the motor to pick up speed for 1/4 malta cross drive wheel revolution 
before the pin hits a slot and some leeway in starting/stopping the 
motor. Thus no load on the motor when starting and you could use a 
smaller motor.

Peter
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