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02 · SUBSECTIONPrehensile Hand System

Tactile fingertip

6 × 6 capacitive tactels under a 2 mm silicone pad, with a 3-axis force cell at the bone.

Close cutaway of a fingertip showing the soft silicone outer pad, a 6-by-6 capacitive tactel sensor grid behind it with glowing optical-electrical feeder fibres, and a 3-axis MEMS force cell mounted on the bone. Leader arrows mark four labelled parts.

Each fingertip carries a 6 × 6 array of capacitive tactels under a 2 mm silicone pad, plus a 3-axis MEMS force cell at the bone. The control loop resolves both normal pressure and incipient slip — the moment an object starts to slide, grip force rises before the object falls.

Spatial resolution is 1.2 mm; refresh is 2 kHz.

SPSpecifications
Tactel array
6 × 6 capacitive per fingertip
Pad
2 mm medical-grade silicone
Spatial resolution
1.2 mm
Refresh
2 kHz