American Machinist

Kiss-and-tell grinding. (Technology Trends).

A major automotive engine manufacturer has installed what is reportedly the first production grinder combining external and internal crankshaft-grinding operations. The new machine, which incorporates "kiss" grinding of the crankshaft thrust wall and internal grinding of the pilot bore, replaces two individual turning operations.

Landis Gardner, Waynesboro, Pa., equipped its Thrust Wall & Pilot Bore machine with separate I.D. and O.D. spindles fitted with cubic-boron-nitride (CBN) wheels. The grinder typically holds perpendicularity and concentricity to within 0.010 and 0.020 mm, respectively.

A key advantage of the process is improving the geometry of part features, claims Russell Kaiser, vice president of engineering at Landis. …

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