1, from the hardware, mechanical parts processing is a variety of mechanical equipment, such as lathes, milling machines, planers, grinding machines, broaching machining centres, etc., the inherent processing accuracy of various equipment are not the same, so to achieve precision machining, it depends on how high the accuracy of your parts corresponding selection of the corresponding process routes and equipment;
2, from the software, is the operator's skills, which involves a variety of equipment operators operating skills, these skills include an in-depth understanding of the equipment, understanding of machining, understanding of the material of the processed parts, etc., these skills can be slowly accumulated in the usual work, the key to the operator's skills is practice, theory should also be understood.

Machining is the process of changing the dimensions or properties of a workpiece by means of a mechanical device. It can be divided into cutting and machining according to the difference in processing methods.

The production process of a machine is the entire process of making a product from raw materials (or semi-finished products). For the production of machines including the transport and preservation of raw materials, the preparation of production, the manufacture of blanks, parts processing and heat treatment, product assembly, and commissioning, painting and packaging and other content. The production process is so extensive that modern companies use the principles and methods of production and guidance to see the production process as a production system with inputs and outputs.