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In lugnet.general, Jason J. Railton writes:
> In lugnet.general, David Schilling writes:
> > Has anyone received their <set:9754> Dark Side Developer Kit yet? I did a • few
> > days ago. The AT-AT is pretty cool. The articulated knee joints are
> > incredible...
>
> Can you tell me how they work? I can see that the upper legs are two parallel
> beams, which can control the angle at the knee joint. But, what operates the
> horizontal bar at the top? It would have to tilt this bar at the same time as
> driving one of the upper beams forward - thus bending the knee and swinging
> the leg forward - but how? The picture is too dark to see.
>
> I've built a walking AT-AT that has straight legs. The top of each leg cranks
> round on a medium gear. There's a horizontal lever pinned to the body at one
> end and to the leg at the other end, just below the crank. This allows the
> leg to move up and down, but makes it pivot back and forth to give a longer
> stride at the foot end. I tried making a knee joint, but it locks up when any
> weight goes on it.
Sounds like what you built was at least partially similar to the way the AT-
AT's leg works. There is a pin at the top to which a short beam is
connected. Two long parallel beams come off this one making the upper part of
the leg, and about half-way down this 'thigh' there is a gear which turns a
crank that one of the long beams is connected to. This is what provides the
force for the leg to walk. The rest is all passive. Anyway, the knee will
always stay parallel with the short beam at the top of the leg, and the rest
of the leg is fixed with respect to the knee. That's how it walks. It's not
particularly easy to explain in words. Better to see it. I wish I could put
up some pictures, but I don't have the ability to at the moment. :-( While I
was at the Kidvention at LEGOLAND, someone 'found' my camera, and didn't turn
it in. Sigh. )-:
--
David Schilling
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