On the Methods for measuring Straightness by Dial Gauge (3 rd Report)

Abstract

By the methods treated in the first and second reports, we can measure the straightness of the surfaces correctly in case of the smooth ones such as mirrors, but in case of the rough surfaces such as scraper-finished ones, the errors of measurement must be taken in calculation. Accordingly, if these rough surfaces were fairly straightened, their straightness measured by these methods may be seriously affected by these errors, and as an extreme case, the practical values will be lost. In this report, the author has mentioned the new integrating method free from such defect, and applying this method to the case of the rough surfaces, made it clear from both theoritical and experimental points of view that fine measurement may be carried out in this case as well as in case of the smooth ones.