Patent ID: 7441484
Filing Date: 2008-10-28
Classification: B23B,Y10S,Y10T

Abstract:
1. A method for pre-scribing a workpiece to facilitate chip breaking when machining the workpiece on the same machine with the same tooling used for cutting, said machine having a frame, a headstock mounted on said frame, spindle fixturing supported in said headstock for holding said workpiece, a spindle fixturing drive for rotating said spindle fixturing, a rotatably indexing tool for machining having one or more cutting edges, said tool adaptable for pre-scribing said workpiece, said method comprising the steps of: placing said workpiece in the spindle fixturing oriented in a cutting position for machining; invoking a CNC cycle of the same CNC machine completing the workpiece machining; indexing said tool down the axial direction of said rotatable workpiece with said edge of said tool in scribing contact with said workpiece on the machining surface; pre-scribing a grooved notch along the workpiece in a line pattern with the grooved notch being scribed at a depth less than the depth of the final machining depth; and, machining said workpiece to said final machining depth.