Abstract: A circuit and process for eliminating unbalances on a rotor which permits equalization of unbalance only in constructionally predetermined equalization planes and component angles in which conventionally produced balance signals indicating the amounts and angles of unbalance are rectified and applied to an arithmetic circuit which produces output signals indicating the amounts of unbalance in equalization planes and, where balance in a given equalization plane is not possible, the amount of unbalance in a substitute plane. To permit balancing of different type workpieces having different dimensions, potentiometers are connected to the arithmetic circuit and to a longitudinal positioning circuit for applying signals indicating locations of the planes.

Abstract: A method and appartus for measuring forces of reaction of a wheel rim and tire so as to minimize smooth road vibrations whereby the wheel and rim are rotated together in a first measuring run, the wheel and rim are rotated with respect to each other by a predetermined angle, and the wheel and rim are rotated together in a second run. The offset angle which minimizes vibrations can then be determined from the reaction forces of the two runs and the wheel and rim rotated with respect to each other to that offset angle.

Abstract: An apparatus for mounting a grinding wheel of the type having a spindle which is rotated by a motor or the like and on which is mounted a grinding wheel and a machine housing between the wheel end drive. A balancing structure includes a first annular housing mounted on the spindle adjacent the wheel and means mounted on the machine housing for injecting a balancing fluid into the annular housing and a second housing mounted on the spindle adjacent the spindle drive.

Abstract: A method and apparatus for selectively measuring oscillation components and vectors in a spectrum, particularly produced by detecting unbalance of a rotary body, with a transducer which includes a pair of coils which move in an alternating magnetic field having an adjustable frequency and an integrating circuit connected to the transducer output so that the desired components are selected in the transducer and integrating circuit.