Subject:
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Re: Dave Schilling's pneumatic parlor trick
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 16 Aug 2005 19:37:54 GMT
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Viewed:
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3260 times
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In lugnet.technic, Kevin L. Clague wrote:
> While at Brickfest I had the chance to meet Dave Schilling again. Dave is a
> very knowlegable technic/robotics builder. I also got the pleasure to meet his
> brother Phil. What a couple of nice guys.
>
> Dave showed me a pneumatic parlor trick that those of you who have pneumatics
> can recreate.
>
> Grasp a hand pump, and hook it to a T using hose. Hook one of the remaining T
> ports to one end of the piston. Hook the final remaining T to the other end of
> the piston.
>
> Pump the pump. Both ports of the piston get the same pressure, yet the piston
> will always expand. It does this slowly, but always happens. If you manually
> compress the piston and let go, it always expands.
>
> Any ideas why this happens? For those of you who know right away (you know who
> you are ;^), lets let the uninitiated talk about this and see if they can figure
> it out!
>
> Hint: As you pump more and increase the pressure, the piston gets slightly
> harder to manually compress. The difficulty of compressing the piston manually
> does not increase dramatically.
Is it because the extension side of the piston face has a greater surface area
than the retraction side? The connection between the piston face and the piston
rod accounting for the difference.
Steve
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Message is in Reply To:
 | | Dave Schilling's pneumatic parlor trick
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| While at Brickfest I had the chance to meet Dave Schilling again. Dave is a very knowlegable technic/robotics builder. I also got the pleasure to meet his brother Phil. What a couple of nice guys. Dave showed me a pneumatic parlor trick that those (...) (19 years ago, 16-Aug-05, to lugnet.technic)
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