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Proceedings Paper

Colath, The Two-Axis Computer Numerical Controlled (CNC)/Interferometer Controlled Diamond Turning Capability Of Philips Research
Author(s): Tom G . Gijsbers
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Paper Abstract

Philips Research Laboratories have developed the COLATH, a high-precision single-point diamond tool machining equipment for con-toured (spherical and aspheric) optical surfaces of revolution. Contour accuracy is better than 0.5 micrometers, surface finish is better than 20 nanometers (peak to valley). Work capacity is 200 millimeters diameter, with X-slide (tool) and 7-slide (spindle) travels of maximum 100 and 200 millimeters, respectively. A Hewlett Packard laser transducer system, interfacing a Philips P 9201 minicomputer, is incorporated for fully automatic X and Z-axis displacement control (resolution λ/40 ≈16 nanometers). The laser-beam path is totally enclosed. Hydro-static bearings and hydraulic drives (linear and rotational) of in-house design have been employed throughout. The oil of the hydraulic system and the ambient air are temperature controlled (± 0.2 centigrades). The COILATH machine is operational since early 1978; so far aspherics for mainly infrared optics and visible-light systems have been produced.

Paper Details

Date Published: 13 May 1981
PDF: 6 pages
Proc. SPIE 0235, Aspheric Optics: Design, Manufacture, Testing, (13 May 1981); doi: 10.1117/12.958960
Show Author Affiliations
Tom G . Gijsbers, Philips Research Laboratories (The Netherlands)

Published in SPIE Proceedings Vol. 0235:
Aspheric Optics: Design, Manufacture, Testing
L. R. Baker; K. J. Rosenbruch, Editor(s)

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