Precision of machining parts of precision machinery

The precision of precision machining parts has the following points:

1. Geometric accuracy

Geometric accuracy refers to the accuracy of the surface or axis of the component parts, such as whether the line is straight, whether the surface is flat, whether the normal section on the cylinder is round, etc. The allowable variation range is represented by "geometric tolerance". The smaller the number of geometric tolerance is, the higher the shape accuracy is.

2. Dimensional accuracy

Dimensional accuracy refers to the accuracy of dimensions after machining, which is expressed by "dimensional tolerance". When the dimensions of parts are the same, the higher the accuracy, the smaller the tolerance number.

3. Position accuracy

Position accuracy refers to the accuracy of the mutual positions between the surfaces of the parts, such as whether the two planes are parallel, vertical, and whether the two axes are coaxial, etc., which is expressed by "position tolerance".