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"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.
>
> Has anyone out there successfully built this kind of scissor lift
> mechanism in
> LEGO to lift a nontrivial weight? If so please reply here,
> <http://www.brickpile.com/2006/03/03/scissor-lift-in-technic/#comments
> comment
> on my blog> or email me any tips you may have. Thanks!
>
> --Bill.
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. Since the worm gear can slide along an axle, make the axle
stationary, but the gear mechanism where it can slid back and forth. You
can then attach technic beams to the cross axle going through the 24t gear.
As the motor shaft turns the worm gear, it will cause a rotational force to
the scissor extending it, and the whole mechanism should be able to slide
(because when the scissor extends, it pulls opposite side together).
Hope it works. That's only a theory!!!!
Rob
www.brickmodder.net
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"Rob Hendrix" <rob.removebeforesending@msltc.org> wrote in message
news:IvKKqA.255E@lugnet.com...
> My $.02, but I'm no mechanical genius:
Rob,
You are one of the above.
Bob Fay
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In lugnet.technic, Rob Hendrix wrote:
> My $.02, but I'm no mechanical genius:
I deg to biffer.
> Why don't you use one of those gear holders that holds a worm gear and 24t
> gear in it. Since the worm gear can slide along an axle, make the axle
> stationary, but the gear mechanism where it can slid back and forth. You
> can then attach technic beams to the cross axle going through the 24t gear.
> As the motor shaft turns the worm gear, it will cause a rotational force to
> the scissor extending it, and the whole mechanism should be able to slide
> (because when the scissor extends, it pulls opposite side together).
>
> Hope it works. That's only a theory!!!!
That may just be crazy enough to work. I'll try it!
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