Subject:
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Re: SSClagorpion - Compressor
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 8 Jun 2004 19:24:12 GMT
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Viewed:
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21187 times
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In lugnet.technic, Steve Hassenplug wrote:
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In lugnet.technic, Kevin L. Clague wrote:
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I know how much Steve likes to wait, so......
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The pumps do not achieve full range of motion. They expand completely, but
do not contract completely. This is because the pistons are not perfectly
placed away from the center, so the extra length of the unused throw allows
the small pulley that hooks all the pistons together to twist.
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I was wondering about that.
Wait, that doesn’t seem quite right.
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I know.
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They all connect together, and that assembly is attached to a medium pully,
right? So, the assembly moves back and forth (actually, in a circle) two
full studs. Is that the complete distance of travel for a small piston?
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The medium pulley connects the six pump arms into an assembly that is moved
around by the 40T gear. The radius of the circle swept by the inner pin holes
is 1.5 studs, not 2. So the pumps only travel 3/4 of the maximum distance.
The off-center axle holes of the 40T are the right distance, but present a
problem because they are axle holes (and thus won’t let the small pulleys twist
like they have to.
I think I can get to a better geometry using 1x4 thin liftarms attached to the
axle hole of the 40T. This will make the compressor wider, but that is not too
much of an issue.
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At each point in the circle, one piston should be fully extended, and another
fully contracted. So it shouldn’t be possible for the pully the are all
attached to, to twist.
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Right. That is what I was trying to say above but stated it wrong.......
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Anyway, it looks nice. Have you run it?
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Kevin
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Message is in Reply To:
 | | Re: SSClagorpion - Compressor
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| (...) I was wondering about that. Wait, that doesn't seem quite right. They all connect together, and that assembly is attached to a medium pully, right? So, the assembly moves back and forth (actually, in a circle) two full studs. Is that the (...) (20 years ago, 8-Jun-04, to lugnet.technic, FTX)
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