Abstract: The invention is directed to a method for making coordinate measurements on a workpiece on a machine tool. In this method, the workpiece 25 remains on the machine tool during the measuring operation and is scanned via a measuring arm of a coordinate measuring apparatus 31 set up next to the machine tool 21. The coordinate measuring apparatus 31 has its own measuring system for detecting the movements of the measurement arm 34 or of the probe 35 attached to the measuring arm. It is not absolutely necessary that the coordinate measuring apparatus 21 have its own drives or that it has its own CNC-control because the measurement arm or the probe head can be guided or moved with the aid of an entrainment device 27 by the drives of the machine tool 21.

Abstract: For roughness measurements, a passive roughness probe 118 having a probe tip 119 is exchanged into the measuring probe head of the coordinate measuring apparatus in lieu of the probe pin having a probe ball which is otherwise used to make coordinate measurements. The generation of the measurement points takes place while using the already available measured value transducers 23 in the probe head of the coordinate measuring apparatus. The desired surface characteristic variables are computed from the stored quasi-analog measured point sequence with the aid of a corresponding software module.

Abstract: A coordinate-measuring machine has a vertical column which is linearly guided in one horizontal direction (x) and on which a measurement arm is guided for vertical displaceability. The linear movement (x) is produced by a carriage in which the column is mounted for rotational displacement about a vertical axis. A workpiece to be measured is mounted to a turntable. The construction provides a coordinate measuring machine having four axes, two linear and two rotational, and the machine is structurally compact in terms of the measurement volume which is achievable.