Abstract: A method and apparatus for controlling the infeed of a grinding machine senses the interface force between a grinding wheel and a workpiece to control infeed for grinding a workpiece with diverse grindability characteristics. The infeed is increased in response to an increase in the sensed force until the interface force reaches a predetermined level; while the interface force is decreased to a predetermined level in response to a decrease in the sensed force.

Abstract: A method and apparatus are disclosed for grinding a surface upon a workpiece having disparate grindability characteristics. A mechanical cam is used in the preferred embodiment to model the characteristics of a cylindrical surface and is rotated with the workpiece. The cam imparts motion to a follower which in turn imparts the motion to a pulse generator. Electrical signals which are dependent upon the angular orientation of the workpiece and the grindability characteristics of a circumferential sector of the workpiece in grinding contact with an abrasive wheel are produced by the pulse generator and used to partially control the infeed movement and the interface force between the workpiece and the abrasive wheel.

Abstract: This patent application discloses a mechanism for indicating the shut height in a mechanical press mechanism. It measures the absolute shut height though the press is shown having a variable stroke mechanism.

Abstract: This disclosure is of an article exchange mechanism of the type suited for use in exchange of tools or workpieces in a machine tool. The mechanism is asymmetrical in the sense that each of the positions between which articles are exchanged may be at a different distance from the origin of coordinate axes extending through these positions.

Abstract: This disclosure is of an automatic tool changer on a machine tool which is arranged to produce movement of a tool operator about a rotary axis when the tool is used. The exchange of tools to and from the machine can be automatically accomplished without regard to the position of the tool operator in its normal range of positions. The tool operator does not return to a predetermined angular position for the tool change, but only stops for so long as the execution of that tool change.

Abstract: A digital circuit useful in a numerical control system for determining during a preliminary execution of a program the axial components of a tool offset compensation. During a preliminary operation of the program, the sum of the squares of the axial components of displacement of the tool are compared to the square of the desired tool offset. When the sum of the squares equals or exceeds the square of the offset, the current values of the axial components of displacement are stored and used as the axial offset components during a subsequent execution of the program.