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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Wed, 20 Aug 2003 23:11:21 GMT
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Viewed:
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239 times
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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...
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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