The influence of processing on measured data

If the part surface has a large roughness, while the control of size measurement can be made or the roughness or scallops in their basins that do not give a correct idea of the actual size. In addition, the scallops of the surface with parts quickly crushed (wear out) and the actual size of the part changes drastically. Thus, the machining accuracy will be uncertain if the quality of the surface does not match exactly. Therefore, when assigning a surface roughness in the majority of cases it is necessary to use special tables in which the recommended roughness depending on the quality (accuracy) and the nominal size values, and the accuracy of the form. These data are presented in the technical literature.