Excello Corporation, one of the most respected designers of machinery in the U.S., was the original manufacturer of drill jig bushings in the U.S.Excello did a comprehensive study in perfecting the best design of drill jig bushings. This design has been proven throughout the years. They determined that long bushings required a counter bore.The major enemies of machining are heat and galling; the counter bore allows coolant to pass compacted chips, solving much of these problems and chips are more easily removed.
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