The currently devised solution
The WireMan (Wire
Manipulator) is a robotic force-feedback, wire actuated device. It consists
of a rigid frame to be carried as a knapsack; from three corners of the
frame, as many pre-tensed wires converge to a thimble, lodging the user's
finger. Measure of the unwinded stretches informs the system on the finger's
position with respect to the reference frame of the device.
A robotic arm placed on a shoulder, realizing the three polar coordinates, was the first choice. Drawbacks are: weight, needed power, reduced workspace, reduced resolution.
WireMan Photo-Gallery (click on the image to enlarge)
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