John Prosock Machine Inc. is a Quak-ertown, Pa., job shop that handles pro-totype machining as well as production and assembly jobs. Founded in 1982, the 30-employee shop has 10 mills and 13 lathes. Production runs range from 100 to 2,000 pieces for a range of customers. "We pretty much do anything," said Claude Farrington, plant manager. "Medical work, driveline components, heavy equipment, parts for remote-control cars, you name it." Describing the machining of a prototype aluminum trunnion housing, Farrington said the actual machining of the complex-looking part was not too difficult, but determining how to fixture it was a challenge. The roughly 11 1/2-long X 5 1/2"-wide housing was designed to mount on a boat's transom and house an electronic linear actuator. It is part of a system that provides instant steering response when activated by controls at the helm, eliminating the slow reactions of a cable system.
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