Subject:
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Re: single motor pneumatic pump and switch
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 24 Oct 2000 20:38:41 GMT
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Original-From:
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Ben Gracewood <gracewoodben@hotmailNOSPAM.com>
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Viewed:
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824 times
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I think the key is that the differential has a lot less resisitance than the
white slip gear.
Your idea would work, but if I understand you, the slip gear would be
slipping the whole time the pump is pumping, meaning the motor has to
overcome the slip friction AND turn the pump.
In the original design, the nice low-friction diff spins freely once the
switch is thrown, and the slip gear is only used to prevent the motor
stalling when max pressure is reached.
Maybe someone needs to invent (or has invented?) a variable-torque slip
gear. This switching application would only need a tiny amount of torque so
a near-freewheeling slip gear would allow a Mike's nice minature version to
work.
Late nights ahead methinks.
Ben.
mike mcfarlane wrote:
>
> Does this mechanism actually need the differential? If you used a 24 tooth
> crown (the horrible bendy one) on the motor and this turned the white slip
> gear for the switch and also a standard 24 tooth for the pump, the diff
> isn't
> needed, or is it just too late at night for me to think clearly? (The white
> gear and the standard gear aren't connected with a central shaft as shown
> in
> the pics. The rest of the layout is similar.) So when you run the motor in
> one
> direction the white gear moves the switch until the end of travel then it
> slips and the pump gear, well, pumps. Reverse the motor to move the switch
> again.
>
> Tis a good idea though and a neat design.
>
> Mike
>
> In lugnet.robotics, John Barnes writes:
> > A truely ingenious little mechanism. I wonder if mechanical engineers
> > in the real world ever get jealous of how easy it is for us Lego world
> > engineers to do such rapid prototyping.
> >
> > ... and in reply to Ralph's comment, who was the famous figure who
> > proposed closing the patent office a hundred or so years ago on the
> > grounds that everything had been invented?
> >
> > JB
> >
> >
> > > Ralph Hempel wrote:
> > >
> > > This is a really interesting twist on pneumatic switching! And
> > > we thought it was all done already!
> > >
> > > Nice work.
> > >
> > > > Pneumatic pump and switch using a single motor:
> > > >
> > > > Have a look at:
> > > > http://www.t-online.de/~sibylle.eddy/pneswit.html
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