Exciting news! I've
struggling for months with the design of the fingers on the bionic
hand. I haven't been able to get the force needed to operate the
finger low enough. I always intended to use tendons to actuate the
fingers, and springs or elastic to return the fingers to a straight
position. So the actuator has to pull against the return spring as
well as the friction within the tendon mechanism. Try as I might, I
couldn't get the no load pull weight down below four hundred grams.
Very frustrating. It worked, but 400grams just seemed excessive. Then
I found the TACT hand online, which uses a combination of tendons and
rigid bars to actuate its fingers. It was an epiphany! So I set about
designing my own combination actuated bionic finger. After six
prototypes, we (I couldn't have done it without Toni, my carer) have
got the no load pull weight down to 100 grams. This opened up the
possibility of using nano servos as actuators, making each finger
individually controllable. So i'm setting about redesigning the hand
from scratch – with only four weeks to go before the hackaday prize
deadline. Its possible. Just....
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