Subject:
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Re: Pneumatic Magic Presetnation Maertials
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Thu, 21 Aug 2003 05:15:57 GMT
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Viewed:
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7394 times
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In lugnet.technic, Ross Crawford wrote:
> In lugnet.technic, Kevin L. Clague wrote:
> > In lugnet.technic, Ross Crawford wrote:
> > >
> > > Whew! Glad we got that worked out! But that contradicts what you say in the PPT
> > > presentation, as I pointed out originally!
> > > http://news.lugnet.com/technic/?n=11127
> >
> > Live and learn! I thank all who patiently explained my error.
>
> Happy to play my part!
>
> > I'll fix and
> > update. That is what I love about LEGO, learning and discovery. I'm a computer
> > engineer, not a physicist, and the things I make are highly physical. In this
> > case, incomplete comprehension of the theory got in the way of practical
> > understanding.
>
> LOL! Well I'm sure I've heard of Pascal's Law, but didn't remeber the theory, it
> was just a "gut feeling" that it didn't seem right!
>
> > Not to start this all over, but because the contract face has less area, under
> > *heavy* load conditions, *I think* that expansion can be faster than contraction
> > because of the minor extra force the expand face provides.
>
> I've also been a bit worried about putting a big load on the contract stroke,
> because of the possibility of leakage around the connecting rod. Although the
> LEGO pistons seem to be *very* well sealed [1], it always struck me as a weak
> point...
The biggest issue when fully expanded is leverage to the side which can lead to
leakage. I've experienced it once in a while.
Kevin
>
> ROSCO
>
> [1] Which no doubt increases the friction. I guess life is full of compromise...
> I think LEGO probably compromised in the right direction in this case - you can
> always build a bigger compressor ;)
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Message has 1 Reply:
 | | Re: Pneumatic Magic Presetnation Maertials
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| "Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message (...) lead to (...) Interesting, I've noticed this happens quite a lot when joing two large cylinders back to back to make a larger double cylinder, and some cylinders seem more prone to it (...) (23 years ago, 21-Aug-03, to lugnet.technic, lugnet.robotics)
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