Subject:
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Re: Mechanical tricks
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 2 Nov 2001 18:54:59 GMT
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Original-From:
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Tilman Sporkert <tilman@webmethods.SAYNOTOSPAMcom>
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Viewed:
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851 times
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There are many ways how to do this, but they aren't easy to describe in
text.
Make two "cranks" (i.e. wheels with a peg inserted off-center) and connect
them with a rod. The first wheel should have the peg closer to the center
than the second wheel. That will cause the second wheel to simple rotate
back and forth, maybe a 1/4 turn. Now we are already halfway there, i.e. you
have a back and forth motion. Next just need to add something that only
turns the output when turned in one direction, but not the other. So when
the wheel turns forth, your output turns, when it turns back, your output
pauses. The Mindstorms Constructopedia has examples on how to do this - it's
used to drive two things from a single motor. Use a differential with
ratchets that allow the output axles to only spin in one direction (opposite
of course). So when you turn the differential one way, one output axles
turns, and when you turn it the other way, the other one will spin. Voila!
Use additional gears to get the output to turn exactly 1/4 turn during each
cycle.
Tilman
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Mechanical tricks
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| (...) It sounds like you want either a linkage or an escapement, depending on how strict you need to be with no motion during the pauses. I suggest browsing around (URL) ; they have many different linkages, line generators, cranks, and escapements (...) (23 years ago, 2-Nov-01, to lugnet.robotics)
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