Patent ID: 6666118
Filing Date: 2003-12-23
Classification: B23B,Y10T

Abstract:
A turning tool for machining piston skirts, said tool having a tip with a cutting edge engagable with a piston skirt for cutting material during turning of the skirt to provide a sculptured bearing surface, said cutting edge including:a protruding portion including a shallow curvature extending laterally in opposite directions and rearward from a forward point; and a generally linear portion extending laterally outward from a second point of the protruding portion, said second point spaced to one side of and slightly behind said forward point; wherein said protruding portion extends beyond said linear portion a distance not greater than 0.01 mm, said protruding portion is an arc centered on a longitudinal axis extending through said forward point, and said second point lies on the arc to one side of the axis, said linear portion lying normal to said axis, the tool including curved portions connecting the arc and the linear portion with angular sides of the tip; whereby the tool is adapted to form a turned surface having in cross section a series of bearing plateaus separated by shallow valleys having slightly sloping sides adjoining the plateaus.