In some mechanical parts design manuals and mechanical manufacturing monographs, there are many introductions to the experience and calculation formulas of the surface roughness of mechanical parts and the dimensional tolerances of mechanical parts, and the list is for readers to choose, but as long as you read them carefully, you will It is found that although the exact same empirical calculation formula is adopted, the values in the list are not all the same, and some still have big differences. This brings confusion to people who are not familiar with the situation. At the same time, it also increases their difficulty in selecting surface roughness in the work of mechanical parts. In actual work, for different types of machines, their parts have different requirements for surface roughness under the same dimensional tolerance. This is the stability problem of cooperation. In the design and manufacturing process of mechanical parts, for different types of machines, the requirements for the stability and interchangeability of the parts are different.
