1. Machining accuracy and surface roughness
the actual size parts machining accuracy of the surface after processing, the desired shape, and position of the three kinds of geometrical parameters of the geometric parameters drawings degree of compliance. Over the geometrical parameters, in terms of size, it is the average size; for surface geometry, is absolutely round, cylindrical, flat, tapered and straight lines; on the mutual position between the surfaces is concerned, is absolutely parallel , vertical, coaxial symmetry. The actual values deviate from the ideal geometry of the part geometry parameters referred processing error.
refers to a surface roughness of the processed surface having fine peak and small pitch unevenness. The distance between its two troughs or two peaks (the pitch) is small (less than 1mm), it is difficult to distinguish with the naked eye, so it belongs to the micro geometry error. The smaller the surface roughness, the smoother the surface.