Making Machines Safe

Drill Bit

Ronald J. Panunto, P.E., Electrical Engineering Consultant ::::
Case Synopsis: Plaintiff was injured when his core-boring machine struck a rebar and jammed. When the drill bit jammed, the drill carriage broke free, began to turn and slammed into his body. An expert was retained in order to determine if a safety system could be designed whereby the drill motor would stop if the drill bit jammed.
Expert Analysis: An internet search was conducted in order to find a vendor who manufactured speed switches that readily adopted to cylindrical shafts. This was needed in order to sense zero speed on the drill shaft. Upon arrival of the speed switch, a bracket was built to hold the speed sensor attached to the drill carriage. The magnetic split ring speed device was then attached to the drill shaft. Continue reading “Making Machines Safe”