Hommelwerke Gmbh

Jorg Schmidt

Karl Hutter

Ernst Schwar

Jurgen Walde

Werner Lenz

Bernd Dreier

Thomas Weissweiler

Eckehart Gortat

Surface testing machine

A device for measuring the contour of a surface along a scanning line. The device includes an electro-mechanical transducer with a scanner arm on whose free end there is a sensing tip. The other end of the arm is connected, via a pivot bearing whose axis of rotation is parallel to the surface to be scanned and vertical to the scanning line, with an advance mechanism. The advance mechanism moves the pivot bearing along the scanning line. The transducer emits, corresponding to excursions of the sensing tip transverse to the scanning line, a measurement signal that is fed into a recording device. The recording device records the electrical signal on the basis of distance or time. A control device is provided into which the electrical measurement signal is fed. On the basis of the magnitude of the electrical measurement signal, the control device produces an advance or a lag of the advance mechanism or of the time axis of the recording device relative to the advance of the advance mechanism. The advance or lag is in a degree and a direction that correspond to the movement of the scanning point in the advance direction relative to its pivot bearing in the case of excursions essentially vertical to the direction of advance. In this way, measurement errors caused by excursions of the scanning arm are substantially suppressed.

Device for measuring the contour of a surface along a scanning line

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Dauchingen, Germany

Jorg Schmidt