Holding 0.001-inch tolerances while machining and removing large amounts of material from a brass part is a challenging task when the job is run at 10,000 revolutions per minute with feed rate of 240 inches per minute. If the workholding isn't rigid enough, part quality suffers, cutter life is reduced, downtime occurs and operator frustration sets in. It's a task that requires the rigidity of ductile iron workholding, says Bill Roberts, senior process engineer for Roberts Automatic Products, Chanhassen, Minnesota, a shop that has been in business for more than half a century.
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