Subject:
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Re: A free motorized switch with every compressor
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Wed, 11 Jun 2003 17:56:26 GMT
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Viewed:
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1562 times
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In lugnet.technic, Thomas Avery wrote:
> In lugnet.technic, Kevin L. Clague wrote:
> > I love differentials.
> >
> > I wanted to share another trick I figured out while playing with pneumatics. By
> > combining a differential with the motor(s) and pump(s) of a compressor, you can
> > make a motorized switch.
> >
> > http://www.brickshelf.com/gallery/kclague/compressors/p6070073.jpg
>
> Pretty cool. I like the way you've symmetrically supported the large hand pump.
> You've placed a gear on both sides of the handle.
>
> Now this may seem the obvious thing to do with the large pumps, given the
> relatively large force required to push them. But I've always wondered if it
> would be beneficial to do the same with the small compressor tubes (i.e. the
> small "pumps").
>
> Typically, when people build compressors using the small pumps, the support peg
> or axle that attaches to the end of the pump is cantilevered out from the wheel.
> Given the tolerances of LEGO and the "stretchability" of ABS, this peg or axle
> can bend out of axis. In other words, if your peg or axle is horizontal, it will
> bend upwards when loaded. This causes side load on the pump.
>
> If you support it on either side (like you did with the large pump), you remedy
> this problem. I'm just wondering if this would be effective or not in making a
> more efficient pump.
>
> -TJ
I never liked my pumps 'hangin' out there'--I always put the other side on,
whether I'm using the pulley wheels for the small pump, or the 40t gears for the
big ones--having the pullys/gears on both sides of the pump handle makes it so
much more secure.
I found that not having them sometimes leads to catastrophic failure, especially
when the pressure gets too high in the lines and the motor is trying to drive
the pump--it has flexed to the point where the peg comes out of the
pulleys/gears and then your whole robot system comes apart.
But that's also fun to watch sometimes....
Dave K
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