When Waltz Brothers Inc. needed to create flight-critical hydraulic pumps, it initially relied on standard horizontal honing equipment, which depends heavily on operator skill. The operator needed to hone one bore, clean the part, air gage it at three different levels and then at 90°-bottom, middle and top-to check for issues, such as tapering that may need to be feathered out. If one bore is incorrectly honed, it can result in a scrapped part.
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