Colath, The Two-Axis Computer Numerical Controlled (CNC)/Interferometer Controlled Diamond Turning Capability Of Philips Research

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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.© (1981) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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