Philips Research Laboratories have developed various new facilities for high-precision single-point diamond turning and precision grinding during the last few years. The COLATH machine, a high-precision NC lathe, operational since 1978 and generating contour accuracies better than 0.5 micron with an optically smooth surface finish (peak-to-valley < 20 nm), has been renovated in several aspects. Other new machines have been built. For transferring the precision machining technology in an effective way from the research section to the production departments of Philips, a second COLATH was built and installed in the Machine Factories (June 19831. A special grinding machine for manufacturing ultra-precision single-point diamond tools (ΔR <0.2 micron) was also built. The ultra-precise tools produced are available for external customers. In the last few years precision grinding in hard materials (steel, glass) for making moulds has been perfectioned; new precision measurement equipment is being developed and installed.
Tom G. Gijsbers, Tom G. Gijsbers,
"Some Aspects Of Precision Machining Within Philips In 1984", Proc. SPIE 0508, Production Aspects of Single Point Machined Optics, (11 December 1984); doi: 10.1117/12.944958; https://doi.org/10.1117/12.944958