Subject:
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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 16:52:47 GMT
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Viewed:
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3219 times
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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 of you who have pneumatics
can recreate.
Grap 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 ro 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.
Kevin
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Message has 1 Reply:
 | | Re: Dave Schilling's pneumatic parlor trick
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| (...) 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 (19 years ago, 16-Aug-05, to lugnet.technic)
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