Position error estimation during the measurement of flatness and straightness based on the method of pitch by the digital electronic gradienter;

Research is made on adopting the bipacth measurement to survey the line scale errors and the least square method to deal with dare in order to increase the precision of the original data.

In this paper, the author proposed a new equal distance adjusting method for the spectrometer, on the basis of detailed analysis of spectrometers adjustive process.

Tolerance of Chain Contact Pitch and Chain Length in the New Edaphic and Mineral Chain Ditcher;

The formulas concern two kind of saw chains with same pitch and different pitch and three kind of sprockets,which are rim sprocket,spur sprocket and nose sprocket.

Based on study and precision analyses on the outer diameter and pitch measure of the synchronization belt-wheels,the paper considers that standard offset can be measured only by using ordinary tools and effective and dependable result obtained.