And, if a robot arm were to swing out towards you, for safety reasons you would want to be able to immediately stop it and push it back without harming yourself, reverse that motion instantly. For one thing, that requires a back-driveable actuator.
Researchers in California are experimenting with air driven actuation
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Crawford - whose parent company is based in the US - was approached for comment, but the firm referred the BBC to the NHS.
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Author(s): Oliver A. Dicks, Solveig S. Aamlid, Alannah M. Hallas, Joerg Rottler