Subject:
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Scissor Lift in LEGO?
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 3 Mar 2006 20:27:31 GMT
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Viewed:
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6539 times
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(cross posted to my blog and BayLUG Mindstorms mailing list)
Have you ever tried building a scissor lift in LEGO? I’m working on a project
that calls for that kind of mechanism to lift it up, like those food service
trucks at the airport. It is based on an “X” shaped arrangement, which, like the
two parts of a scissors pivot at the middle. By bringing together the two bottom
(or top) ends, the top is lifted into the air.
The approach I took was to use Technic worm gears (like a screw) with a rack
gear on it. By turning the worm gears the rack gear should move along its
length, which moves the two bottom ends together, elevating the top. The problem
is that LEGO gears just aren’t up to the load this places on them, and the teeth
skip. I motorized it, gearing down the motor to get more torque, but the gears
would rather skip than lift the weight.
Has anyone out there successfully built this kind of scissor lift mechanism in
LEGO to lift a nontrivial weight? If so please reply here,
comment
on my blog or email me any tips you may have. Thanks!
--Bill.
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Message has 5 Replies:
 | | Re: Scissor Lift in LEGO?
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| "Bill Ward" <bill@wards.net> wrote in message news:IvKJHv.1xLK@lugnet.com... (...) Posting to Lugnet so others can see. My $.02, but I'm no mechanical genius: Why don't you use one of those gear holders that holds a worm gear and 24t gear in it. (...) (18 years ago, 3-Mar-06, to lugnet.technic)
| | | Re: Scissor Lift in LEGO?
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| (...) Haven't actually built one, but one other possibility may be to use string rather than gearing directly. How many scissors are there in your lift? On the real ones I've seen they often have a hydraulic cylinder going from the bottom scissor to (...) (18 years ago, 3-Mar-06, to lugnet.technic, FTX)
| | | Re: Scissor Lift in LEGO?
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| Some photos of what you've tried so far would help a great deal. I was wondering if it would be possible to see how cloesly you're matching up the worm gears to the rack gears, theoretically, it should be possible, but if you're using more than one (...) (18 years ago, 4-Mar-06, to lugnet.technic)
| | | Re: Scissor Lift in LEGO?
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| (...) Hi Bill. I came up with a design about a month ago. It was never finished, but may be in the future. (URL) only problem is that the way I have it angled, the pistons have to push hard at the beginning of the ascension. However, this is the (...) (18 years ago, 6-Mar-06, to lugnet.technic)
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