In mechanical processing, one often hears the terms "precision", "tolerance" and "surface roughness". These terms are directly related to the quality of the parts and the assembly effect.
Precision refers to the degree of closeness between the processed parts and the design drawings. The higher the precision, the smaller the error.
Tolerance is the allowable range of error. It is not an error itself, but rather a "tolerance value" for errors, ensuring that the parts can be assembled smoothly without affecting their functions.
Surface roughness describes the microscopic ups and downs on the surface of the parts, affecting the sealing performance, friction properties and appearance of the product.
In simple terms, precision and tolerance determine "whether the work is accurate or not", while surface roughness determines "whether the work is smooth or not". Although these parameters are very small, they determine the performance and service life of the entire equipment. Industries with high requirements, such as aerospace and medical devices, strictly control these three indicators. Understanding them is not only a basic quality for engineers but also helps customers express their product requirements more clearly.
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