Inventors:
Ernest R. Siler - Springboro OH, US
Ronald G. Smith - New Carlisle OH, US
Kathleen Murphy - Wilmington OH, US
David B. Drennen - Bellbrook OH, US
Patrick A. Mescher - Bellbrook OH, US
Thomas J. Bucholz - Sanford MI, US
Assignee:
Delphi Technologies, Inc. - Troy MI
International Classification:
B21H 3/02
US Classification:
470 8, 470 10, 470 18, 470 66
Abstract:
A method for making a ball-nut includes cutting a 360-degree closed-loop surface groove in the inner-circumferential wall portion of a ball-nut body using a whirling-type internal-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal axis of the wall portion, is adapted for receiving a plurality of ball bearings, includes a helical-grooved portion substantially coaxially aligned with the longitudinal axis, and includes a crossover-grooved portion. A method for making a ball-screw includes cutting at least one 360-degree closed-loop surface groove in the outer-circumferential wall portion of a ball-screw body using a whirling-type external-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal axis of the wall portion, is adapted for receiving a plurality of ball bearings, includes a helical-grooved portion substantially coaxially aligned with the longitudinal axis, and includes a cross-under-grooved portion.