Sigma Stamping, Auburn Hills, MI, a division of Koppy Corp., specializes in supplying automotive transmission components and assemblies. With its 100 employees operating in two shifts, it cranks out large stampings through a stable of behemoth mechanical presses in capacities form 1000 to 3500 tons. It recently took over a contract to provide a stamped 54-in.-long cross member weighing upward of 30 1b.
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