Subject:
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Re: Scissor Lift in LEGO?
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 4 Mar 2006 00:06:37 GMT
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Reply-To:
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Geoffrey Hyde <GDOTHYDE@BIGPONDDOTNETDOTAUihatespam>
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Viewed:
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7004 times
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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 worm gear against a rack gear, the
construction has to hold it in place and the worm thread on the worm gear
needs to be precisely aligned with the line of the rotational thread of the
worm gear next to it or your worm gears will be out of rotational sync with
each other - unless you're only using one worm gear on each rack part.
Cheers ...
Geoffrey Hyde
"Bill Ward" <bill@wards.net> wrote in message news:IvKJHv.1xLK@lugnet.com...
> (cross posted to
> <http://www.brickpile.com/2006/03/03/scissor-lift-in-technic/
> 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.
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Message has 2 Replies:
 | | Re: Scissor Lift in LEGO?
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| "Geoffrey Hyde" <g.hyde@bigpond.net.au> wrote in message news:IvKtn1.16vD@lugnet.com... (...) (URL) may give some ideas. I made a nut out of two 8 tooth gears and used a string of worm gears as a lead screw, but I cannot find the picture. The best (...) (19 years ago, 4-Mar-06, to lugnet.technic)
| | | Re: Scissor Lift in LEGO?
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| (...) I'm sure they would. Sorry I just haven't taken any yet. But this thread has given me some great ideas to try... (...) The worm gears are aligned carefully, and they seem to mesh fairly well, but I think ultimately rack gears and worm gears in (...) (19 years ago, 5-Mar-06, to lugnet.technic)
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Message is in Reply To:
| | Scissor Lift in LEGO?
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| (cross posted to (URL) 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 (...) (19 years ago, 3-Mar-06, to lugnet.technic, FTX)
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