Re: Humanoid Proportion info as ratios ?

I would love to see more of this - including photos of
what you've done.

So would I :o(

The original design was in laser cut plate, all I had to
work with at the time and I couldn't fit it all in where it
got skinny, particularly the ankle and the forearm so I gave
up. I know have 2.5D CNC and I've come back to it, but it's
not easy finding the time and I've got a lot more
AutoCadding to do before I start cutting metal.

I haven't figured out the articulation at the base of the
rib cage. It's a power movement (I differentiate power and
gesture) and there isn't a lot of room for it because motors
don't squidge out of the way like intestines so the lower
abdomen is mostly off limits.

I'm also trying to design feet. You can extend the foot
through the Achilles, you can rotate it at the ankle, then
there's the twist. The twist has to be powered from inside
the foot unless you want to start messing with universal
couplings which makes the ankle fat. The toes twist a lot
further than the heel when you turn an ankle so the pivot
point has to be inclined. The pivot turns with the foot when
you extend it but it's movement becomes increasingly
restricted. I think this pivot has to move and align the
toes with the ground as the weight rolls forward off the
heel, and then lock either due to weight falling on the
toes, or due to the extension of the foot. The final twist
just before it leaves the ground can be achieved at the
ankle. Probably. It's so hard to see what's actually
happening, heaven knows I have tried :o)

Then there's the toes. Only one really counts, the rest
vaguely follow it. The big toe can draw power from the foot
extension and become part of it for gait. It also a screw
drive, sprung to allow some flex and gesture but mainly
providing a moveable stop that puts a hard limit on upward
movement so it can contribute to static balance.

You've probably guessed I don't get to talk about this stuff
much.

Robin



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