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Proceedings Paper

Manufacturing And Measuring Of Aspherics Integrated In One Ultra Precision Machine
Author(s): Pierre H. Knol; Denes Szepesi; P. Guenther Werner; Wilhelm Knappert
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Paper Abstract

Hembrug recently developed the method of tool-normality for machining aspherics on the Super-Mikroturn CNC ultra precision lathe. This method allows the single point diamond tool to be kept perpendicular to the surface and eliminates the influence of tool tip radius error. Due to the perpendicularity of the tool, this method also allows the integration of a dedicated sensor system for in-process measurement. The realisation is carried out by a hydrostatic, numerically controlled precision rotary table, together with a software package for 3-axis interpolation. To measure the surface topography and reflection value of metal optics, a non-contact sensor, consisting of a bundle of glass fibers concentrically arranged is now in development. A number of these fibers are connected to a light source and the remaining fibers are used to transmit the reflected light from the surface. The intensity of the reflected light versus the distance generates a diagram of which the shape characterizes the roughness and the reflection of the measured surface. The integration of such a dedicated sensor into an ultra precision machine tool in combination with the evaluated characteristic diagram makes it possible to obtain data of the shape of surface topography and reflection values performing the first step of an in-process adaptive control system. The paper will deal in greater detail with the development of this new concept of ultra precision machining and measuring problems connected to the process.

Paper Details

Date Published: 11 April 1989
PDF: 10 pages
Proc. SPIE 1015, Micromachining Optical Components and Precision Engineering, (11 April 1989); doi: 10.1117/12.949442
Show Author Affiliations
Pierre H. Knol, Hembrug B.V. (The Netherlands)
Denes Szepesi, Hembrug B.V. (The Netherlands)
P. Guenther Werner, University of Bremen (W.Germany)
Wilhelm Knappert, University of Bremen (W.Germany)

Published in SPIE Proceedings Vol. 1015:
Micromachining Optical Components and Precision Engineering
Peter Langenbeck, Editor(s)

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