Abstract: An apparatus is provided for testing and calibrating a sensor of a complex machine tool while the sensor is completely separated from the machine tool. The sensor, which is typically a gear tooth sensor, can typically comprise a sensing head and a printed circuit board which contains an electronic circuit designed to manipulate signals received from the sensing head. A movable target, such as a gear tooth wheel, is driven by an air motor, and the sensing head is attached to a support structure with the operative surface of the sensing head being located a preselected distance from the discontinuities of the target simulator. A signal receiver, such as oscilloscope is easily connected in signal communication with the printed circuit board so that an operator can adjust the amplitude and offset of the signals as the target simulator is operated.

Abstract: A hand truck or dolly is shown which includes a frame pivotable on a pair of wheels. The frame includes a foot plate and a slidable bracket on which a heavy item to be carried can be mounted. The support can be raised by a screw operated by a hand crank or power-assisted elevator, while one end of the screw is fastened to the foot plate.