Two "grit-blasting robots," developed at the University of Technology, Sydney, are being used to clean and prepare the Sydney Harbour Bridge for repainting. The machines, with cameras and sensors on board, scan and map the structure, and then figure out how much force they need to apply when they shoot out compressed air and grit to do the stripping. "The job [of cleaning the bridge] is very risky [for humans] -- the bridge vibrates because of the traffic and it has complex geography -- which is why we approached UTS to see if a machine could do this kind of work," said Waruna Kaluarachchi from the Roads and Maritime Service.

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