Subject:
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Re: Has anyone ever tried to design a washing machine mechanism?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 27 Jul 2000 15:02:12 GMT
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Original-From:
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John Barnes <barnes@STOPSPAMMERSsensors.com>
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Viewed:
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1156 times
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I am wondering if you couldn't use the robo-riders container as the basis
for your drum. It has a hole for a technic axle in the lid, so, you could pass
the agitator axle in through there. You may have to do something "non-lego"
to power the drum, unless you put one of the long rubber bands around it
and drive it from a pulley. I think I had an old washing machine once that
actually worked like that!
JB
> In lugnet.technic, Geoffrey Hyde writes:
>
> > The bowl itself would either have to be a special piece of material not made
> > out of LEGO or we'd have to wait until they produced one for us
>
> Duplo set 2983 includes a barrel that's about 6 studs in diameter by 9 or 10
> high. You'd need to drill the bottom for the agitator axle, but I think
> that's only a "venial" sin among purists, compared to introducing a
> "foreign element" ;-)
>
> Other possibilities might be the 8- and 10-stud octagonal domes used in
> various space and underwater models.
>
> > I hope someone has tried at least the mechanism, it would be interesting to
> > see how to design the rotational movement power for the washing tub changing
> > to a cam-based movement
>
> I think the agitator and the tub are concentric, but separate, mechanisms.
> Iirc, the tub on mine is stationary during the wash and rinse cycles,
> letting the agitator do *all* the agitating work.
>
> > I think cams would be a key element somewhere in
> > this.
>
> They could be: it depends on how much the agitator actually rotates.
>
> A possibility, if you were willing to accept a limit of, say, 120 degrees
> of rotation, would be to put a fixed arm perpendicular to the agitator
> axle (a pin in a 40-tooth gear might do this). Then connect that arm to
> something equivalent to the rod in a car engine. At the other end of the rod
> would be either a car-like crankshaft, or a reciprocating mechanism like a
> pneumatic cylinder.
>
> The net effect is to turn the reciprocating motion of the rod into partial
> back-and-forth rotation of the agitator. The travel of the recirprocating
> mechanism has to be chosen to that it doesn't swing the agitator arm through
> too many degrees. I picked 120 because it seemed fairly safe: it
> completely eliminates the risks of going full circle and of "lock-up" if
> the two arms get parallel. I *think* there's also a variation in the amount
> of leverage the reciprocating mechanism gets, based on the angular
> position of the arm attached to the agitator: i.e., that arm looks like a
> varying-length lever to the reciprocator. I'd have to try it to be sure,
> but that's what my mental model feels like.
>
> Ran
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