New system of on-line measurement of the spiral error of a large gear

It is difficult to on-line measure the large gear''s spiral error based on the coventional method and theory because of some specialities of a large gear. A new system of on-line measuring the large gear'' s spiral error has been studied in this paper. The measuring theory of the system and the system'' s structure have been introduced in this paper. While this new and original method mentioned in this paper has been used the measuring system will be very simple which makes it easy to measure by side.