一、前言测量机床导轨、平尺等长表面的不直度时,一般难以实现用实物为基准,而只能设法在测量方法中体现存在一条假想的理想直线作为测量基准,节距测量法就是为适应这样的需要而产生的。这种测量方法在机修工作中虽然已被广泛采用,但不少同志对其原理仍不甚理解,因而在实际工作中存在不少错误的做法。 I. INTRODUCTION When measuring the straightness of a machine tool’s guide rail and flat ruler, it is generally difficult to realize the actual object as a reference. Instead, it can only try to find an imaginary ideal straight line as the measurement reference in the measurement method. The pitch measurement method is Produced to meet such needs. Although this measurement method has been widely adopted in mechanic repair work, many comrades still do not quite understand its principle. Therefore, there are many wrong practices in practical work.