Subject:
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Re: A Beautiful Machine prototype and perhaps a challenge/idea
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 11 May 2006 22:29:48 GMT
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Viewed:
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2315 times
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In lugnet.robotics, Rafe Donahue wrote:
>
>
> Danny Staple wrote:
>
> > In lugnet.robotics, Rafe Donahue wrote: <snip>
> >
> > I like your version, first its more cute and friendly, and secondly you can see
> > the workings. I take it that when powered off, the scissor lift retracts again
> > under its own weight as the motor offers no resistance?
> <snip>
>
> It is slightly more complicated than that. In order to make it go up
> slow enough to be interesting, I had to gear down the speed of the
> motor. As such I go from 8 teeth (I think) on the motor to the big 40
> (?) teeth on the scissors. There is still some resistance in the motor
> that is then increased when the scissors retracts because during the
> retraction the gearing goes big to little.
>
> So the trick was to use one of those wind-up motors. Enough energy is
> put into the motor while the scissors is going up so that the wind-up
> motor can get it going to fall back down.
Very nifty! Another way would be to have a second switch that is on except when
the scissors are at the bottom, and wire it in parallel with the activation
switch. Sorta like how they get car windscreen wipers to always go back to the
right spot.
ROSCO
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