Abstract: The sensing head of a coordinate measuring machine includes sensing pin combinations or sensing pins which are changeably fastened with high precision in respect to their spatial position. The receiver contains an isostatic three-point bearing against which the connecting body of the sensing pin is drawn by a pneumatically operated clamping arrangement. In the preferred embodiment the clamping arrangement consists of a suction cup and arresting elements for maintaining attachment of the receiving device to the connecting body when there is no subpressure acting upon the suction cup.

Abstract: There is specified a measuring arrangement for rotationally symmetrical workpieces with an adjustable clamping device which carriers the workpiece, and with a movable measuring slide which carries at least one measuring head which measures the workpiece with a sensing pin in a radial direction or an axial direction or both, as the disadvantage is avoided that with a change of the measuring assignment another sensing pin adapted to the new measuring assignment must be reoutfitted in a complicated manner. To accomplish this task the measuring head is equipped with a sensing pin carrier that carries several sensing pins and is turnable. Thus, the sensing pins can be turned rapidly into the measuring position. There they are held fast by a stopping device.

Abstract: In a gear probe for testing the shape and orientation of gear flanks, a control and computer unit is used to effect the necessary positioning between the gear flank to be tested and a measuring sensor. First the gear is positioned coarsely; during this step a transmission disc and a linear transmission track are out of engagement with one another. Thereafter, the measuring sensor is advanced into the tooth gap and a fine positioning for a zero balancing of a potentiometer of the measuring sensor is effected by automatically displacing the linear transmission track with respect to the carriage on which it is mounted or by automatically changing the relative angular position between the gear to be tested and the transmission track. All displacements of apparatus components for the coarse and fine positioning as well as for the performance of the measuring process proper are automatically effected by the program-controlled control and computer unit.