Abstract: A measuring gage for internal and external splines of a workpiece employs a pair of opposed aligned gage pins with hardened balls respectively on their outer ends for registry with internal splines of a workpiece and upon their inner ends for registry with the external splines of a workpiece and with the balls lying in a single plane for operative engagement with the workpiece splines. Longitudinal movement of one of the gage pins is adapted to control axial movement of a plunger upon a dial indicator directly or through a linkage for comparing the dimensions of the workpiece spline with respect to a set master size. In gaging external splines, one of the gage pins forms a part of the dial indicator plunger.

Abstract: An automatic fault detection system for use with machine tools to detect the breakage or absence of the tool, the presence and/or absence of a portion of the workpiece, and to prevent the normal cycle of operation of the machine when such condition exists, includes a sensor having a rod, a power port and a pair of pressure sensing ports. First and second pressure sensing switches are connected to the sensing ports wherein the failure of the sensor rod to fully retract or to advance before or beyond good check stroke position respectively exhausts the pressure sensing switches preventing operation of the machine cycle.

Abstract: A detecting device and control system for use with machine tools to detect the breakage of a tool bit, the presence or absence of a portion of a workpiece, and other improper conditions that might result in the production of imperfect work, and to prevent normal operation of the machine whenever any such conditons exist.