Abstract: A machine tool re-machines a workpiece after positioning drive motors, a hob and the workpiece by stopping the drive motors with the rotational positions of the drive motors, the hob and the workpiece corresponding to their respective zero positions. For this purpose, a drive control section recognizes, based on the rotational-speed ratio of the drive motor corresponding to the hob and the hob and/or the rotational-speed ratio of the drive motor corresponding to the workpiece to the workpiece, and detection signals from detection sensors detecting that the rotational positions of the drive motors are at their respective zero positions, detections signals when the rotational positions of the drive motors and the rotational positions of the hob and the workpiece correspond to their respective zero positions, and stops the drive motors with the rotational positions of the drive motors, the hob and the workpiece corresponding to their respective zero positions.

Abstract: A method and apparatus for generating a shape on the periphery of a non-rotating workpiece by orbiting a rotating cutter in cutting engagement with the workpiece. Either the cutter or the workpiece is moved linearly in the lengthwise direction of the workpiece.

Abstract: A method and control system for gear cutting machines such as hobbing equipment, shaper cutters and bevel-cutting equipment for achieving greater accuracy, productivity, and gears of increased quality while eliminating error, tedious calculations, labor and product variation is provided by employing a control system and utilizing a method of hobbing wherein optimum hob cutter efficiency is maintained by electronically monitoring and controlling hob input power, hob shift and workpiece feed to produce gears approaching the optimum theoretical calculated configuration. The method of cutting gears and the control system provides for the production of more accurate gears by eliminating the use of cams in shaper cutters and the use of change gears in hobbing machines and by properly controlling hob shift to result in an increased hob cutter life and provide higher production of optimally designed gears.

Abstract: In a machine of the type in which cutting tools are arranged on successive links of an endless chain, each tool being in offset rotation to the preceding tool, at right angles to the direction of travel, means are provided for periodically shifting the workhead and work spindle parallel with the plane in which the tools travel when cutting. The means for shifting are operatively independent of the means for driving the chain and the work spindle in generation, and are operated when the tools and workpieces are disengaged, and normally after a predetermined number of stacks of workpieces has been cut, in order to equalize wear on the blades carried by the chain.