A computer-controlled machining center, particularly a CADCAM cutting device for dental technology applications, includes a clamping device with a displaceably supported holding device on which a carrier plate for receiving a molded blank is supported. The apparatus includes a tap having an NPT threaded end and a flanged end and an intermediate flange which engages with a stabilizing tube placed around the tap. A structure for raising and lowering the cradle is provided and a cable connects the cradle to the structure for raising and lowering the cradle. Relevant segments are stored in a via area list in the navigation device. It has a switch element for isolating or connecting at least one first electrical pin from or to an input or output of a functional unit integrated in the semiconductor circuit. A lock-in amplifier converts the output of the detector to produce quadrature and in-phase signals for analysis.