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Computer-controlled lapping system for granite surface plates

✍ Scribed by Jiexin Wang; Bi Zhang; Binyuan Xue

Publisher
Society of Manufacturing Engineers
Year
2000
Tongue
English
Weight
554 KB
Volume
19
Category
Article
ISSN
0278-6125

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✦ Synopsis

Granite surface plates are traditionally finished by hand lapping, which is time consuming, strenuous, and costly. Surface quality and accuracies of such plates depend largely on the experience and skill level of the operator. In this study, a computer-controlled system is developed for ultraprecision lapping of granite surface plates. The system can easily achieve a high lapping efficiency and high flatness accuracy due to its capability of on-line measurement of flatness, optimization of the lapping process, and automation of the lapping operation. The system has been successfully applied to a number of granite surface plates, and the results show that a flatness error of less than 2 tJm over a 1 x 2 m area is obtained. This paper also presents the principle of online measurement of flatness and experimental results based on the computer-controlled lapping system.

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