Honing was invented more than 70 years ago to de-glaze cylinder bores in early automobiles. Since then, conventional honing has been routinely used to create Crosshatch surface finish in bores to enhance oil retention to lubricate and seal sliding/mating parts like pistons, plungers and shafts. New technology has made it a good fit for the most advanced aerospace requirements for ultra-precise machined parts. "Computer controls, new tool designs, new abrasives, integrated air-gage part measurement and servo-driven tool feed systems and spindles enable new honing machines to produce part bores with 0.000010" [0.00025-mm] accuracy and crosshatched surface finishes targeted to a very narrow range," said Dennis Westhoff, business development manager, Sunnen Products Co., (St. Louis, MO). "The aerospace industry is constantly tightening the requirements for parts to achieve lighter weight and, particularly, greater performance from end products - higher power densities, more precise control, tighter sealing, less hysteresis, noise and vibration.
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