How to define precision machining

There may be a different understanding of precision machining. How to understand precision machining? How to define precision machining? What is the definition of precision machining?
The definition of precision machining is to complete the final machining of each major surface in steps and steps, including workpiece parallelism, surface finish, surface perpendicularity, surface hardness, etc., so that the machining accuracy and surface quality of the parts are as specified in the drawings. The required process.
Verticality requirement
The so-called verticality requirement requires that the side and the ground of the workpiece meet the tolerance requirements. The best understanding is the proper body. From the point of view of the number axis, it is divided into three sides of XYZ. Generally, XZ and YZ are required to meet the tolerance requirements. The error is also roughly the same as the parallelism requirement. Generally, it can be processed according to the parallelism requirement.
Parallelism requirement
The so-called parallelism requirement is to require the tolerance requirements around the workpiece. For example, a rectangular workpiece requires the thickness of the four corners of the workpiece to reach a certain tolerance range. If the thickness of the four sides of the measurement does not meet the tolerance requirements, the parallelism requirement is not met. This requires re-adjusting the workpiece. The problem may occur in the suction cup of the grinding machine. The suction cup is worn out due to excessive use, resulting in an error in the parallelism. It may also be that the grinding wheel is not trimmed, or the grinding wheel is cracked or notched. At this time, the grinding wheel is re-grinding. It may also be that the suction cup is not cleaned, so it is necessary to clean the suction cup again and clean it carefully; it may also be that the workpiece is not trimmed and burrs appear.
other requirements

For example, the finish. It is required to achieve, such as a mirror effect.

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