Machining precision includes three aspects:

After the processing precision refers to the actual size and parts of the size of the center of consistent with tolerance.

After the processing precision refers to the shape of the workpiece surface geometry and practical ideal geometry of the degree of consistent.

After the processing precision parts related to the actual position between surface and ideal

Machining accuracy is processed parts surface of the actual size, shape, location three geometric parameters and drawings of geometric parameters of the ideal requirements.

The ideal of the geometric parameter, the size of the average size, this is, On the surface geometric shapes, is absolutely round, flat, cylindrical linear cone and etc;, On the surface, the interaction between the position is absolutely parallel, vertical, coaxial, symmetry, etc.