Abstract: A control system for a crankshaft-milling or grinding machine having a milling carriage movable in a plane perpendicular to the longitudinal axis of the crankshaft to be machined. A pulse-generating rotary transducer coupled to the workpiece spindle supplies pulses to a computer to indicate both rotary speed and angular position, the computer issuing the requisite control data. The computer is fed pictorial or construction-point data concerning crank pins and crank webs of arbitrary configuration, the computer issuing the requisite control data for feed speed and position after it itself has calculated such data, the data being issued with a clocking rate and updated at such clocking rate at a frequency corresponding to the required degree of dimensional accuracy.

Abstract: A template controlled machine tool, especially for machining the crankpins of crankshafts. A first template member rotates in unison with a crankshaft mounted on the work axis of the machine. A second template member is mounted on a carriage so that the second template member and carriage are actuated when the first template member rotates. The machine tool has a work carriage on which a tool is mounted. The work carriage is driven by a motor which receives power from an electric circuit that is controlled in conformity with the movement of the template carriage. Each of the carriages actuates a digital measuring device and a comparator compares the pulses therefrom and adjusts the speed of movement of the tool carriage to maintain the tool carriage position in close conformity with that of the template carriage.