Abstract: A table for use with CNC machines has section one table feature being mounted for movement on the base and the other table section being mounted on the one table section. The table means are movable along mutually perpendicular axes, and are controlled in the axes. Motion error is compensated by providing feedback signals that sense and feed back position signals in one controlled axis as the table sections are moved in the other perpendicular axis. Compensation for deviations in motion in the mutually perpendicular axis is provided so that position in each direction of motion is controlled by two feedback signals for error compensation.

Abstract: A cassette type part clamping member holding precision parts of small size to very close tolerances. The parts are clamped in a manner so that they are securely held but are not damaged. The cassette mounts relatively easily made, low cost, and useful reference bar for providing a reference surface against which the parts are clamped and also against which a sensor will operate during an operation such as grinding to insure that a straight grind cut is made. The cassette that holds the part clamping members and the reference bar, and a separate outer cassette holder fixture which provides reference surfaces for supporting the reference bar holding it in position accurately and without affecting the preload on the clamping members is mounted on the tool table. The cassette can be removed from and replaced into the holding fixture without releasing the parts.

Abstract: A control system for precision machine tools and similar devices provides a precise position during active operations on a table supported workpiece or part. The present system provides a support table on which a machine part or specimen is mounted that is controlled in its position through a friction free spring type hinge relative to a base, and which is held therein with a piezoelectric actuator operated in an active closed loop system to maintain a set position without any backlash.