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Thursday, July 28, 2022

Dead Spiders for Robot Grippers.

 Clever Biomimicry Example.  Necrobiotic use of forms, 

Necrobotics: Dead Spiders Reincarnated as Robot Grippers That microhydraulic gripper you’ve always wanted, thanks to an ex-spider   By EVAN ACKERMAN

Bugs have long taunted roboticists with how utterly incredible they are. Astonishingly mobile, amazingly efficient, super robust, and in some cases, literally dirt cheap. But making a robot that’s an insect equivalent is extremely hard—so hard that it’s frequently easier to just hijack living insects themselves and put them to work for us. You know what’s even easier than that, though?

Hijacking and repurposing dead bugs. Welcome to necrobotics.

Spiders are basically hydraulic (or pneumatic) grippers. Living spiders control their limbs by adjusting blood pressure on a limb-by-limb basis through an internal valve system. Higher pressure extends the limb, acting against an antagonistic flexor muscle that curls the limb when the blood pressure within is reduced. This, incidentally, is why spider legs all curl up when the spider shuffles off the mortal coil: There’s a lack of blood pressure to balance the force of the flexors.

This means that actuating all eight limbs of a spider that has joined the choir invisible is relatively straightforward. Simply stab it in the middle of that valve system, inject some air, and poof, all of the legs inflate and straighten. ... ' 

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