Subject:
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Lazy Tongs
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 10 Aug 1999 13:56:29 GMT
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Viewed:
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551 times
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Hello All,
I have a mechanical problem (in addition to all my others).
I'm building a delivery system. A small bot will drive a line to a specified
point. It will then lift a small platform up (not too far. Compressed, it's
about 3 inches tall. Expanded, about 9 inches.) The problem I have is
getting the tongs to compress. For those of you not familiar, this is based
on the expanding "puncher" on the Cyberslam sets.
The essential problem is converting rotary motion to horizontal motion. I
don't want to use pneumatics. They'd take up too much room. I converted Lego
Leo's Archamedies screw, but I can't get enough grip on the axles. Basically,
when I bring the platform down, it pulls all my pieces apart. Or they just
slid up and down the axles.
Anyone have any suggestions?
-T
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Message has 1 Reply:
 | | Re: Lazy Tongs
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| Have you tried a variation on the rack-and-pinion steering design. The old "Expert" sets used it to some degree of success. Basically this involves using a 8-tooth gear and some of the flat "gear" plates. The 8-tooth gear rotates and pulls a 1 by X (...) (25 years ago, 10-Aug-99, to lugnet.robotics)
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