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Examines the use of a precision robot for automatic testing of complex geometries with free‐form surfaces. Each of its three rotation and bending axes have directly driven DC motors and high accuracy optical angle sensors. The distance between the ultrasonic probes and the workpiece can be measured by means of an ultrasonic distance sensor and the data gathered is transmitted to a workstation a graphical representation is produced which is visualised in real time by means of a high‐speed graphics processor. Using menu‐driven software, components with almost any free‐form surface can rapidly be excoriated, modelled and tested with freely selectable paths of very high resolution.

Laser triangulation is a very efficient non‐contact point‐measurement procedure, very similar to a mechanical gauge, but much faster. However, the special characteristics of the laser triangulation sensor (LTS) must be taken into account for its use. The correct selection of sensor and test‐equipment verification, complying with norm ISO 9001, can be facilitated or implemented with the test‐bench for LTS, developed in the quality and production measurement technology laboratory of the Neu‐Technikum Buchs, Switzerland. A wide range of LTSs has been collated in a market analysis; differences of performance have been determined in a widespread comparison.