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機(jī)械加工廠強(qiáng)調(diào)機(jī)械加工要滿足一定的精密度，是指鋼件在機(jī)械加工后的實(shí)際上幾何圖形主要參數(shù)與零件圖紙所要求的理想化值的相一致的水平。而他們中間不相一致的水平，則稱之為生產(chǎn)加工偏差。
機(jī)械加工廠生產(chǎn)加工精密度包含3個層面：一方面是規(guī)格精密度，限定生產(chǎn)加工表層兩者之間標(biāo)準(zhǔn)標(biāo)準(zhǔn)間規(guī)格偏差不超出必須的范疇；另一方面幾何圖形樣子精密度，限定生產(chǎn)加工表層的宏觀經(jīng)濟(jì)幾何圖形樣子偏差，如圓度、圓柱度、平行度和直線度等。
還有一方面則是互相部位精密度，限定機(jī)械加工廠生產(chǎn)加工表層兩者之間標(biāo)準(zhǔn)間的互相部位偏差，如同軸度、平整度和平行度等。生產(chǎn)加工精密度是生產(chǎn)加工后零部件表層的實(shí)際上規(guī)格、樣子、部位幾種幾何圖形主要參數(shù)與工程圖紙規(guī)定的理想化幾何圖形主要參數(shù)的合乎水平。
理想化的幾何圖形主要參數(shù)，對規(guī)格來講，是說均值規(guī)格；對表層幾何圖形樣子來講，是說的圓、圓柱體、平面圖、球面和平行線等；對表層中間的互相部位來講，是說的平行面、豎直、同軸輸出、對稱性等。
機(jī)械加工廠生產(chǎn)零部件實(shí)際上幾何圖形主要參數(shù)與理想化幾何圖形主要參數(shù)的偏移標(biāo)值稱之為生產(chǎn)加工偏差。生產(chǎn)加工精密度與生產(chǎn)加工偏差全是點(diǎn)評生產(chǎn)加工表層幾何圖形主要參數(shù)的專業(yè)術(shù)語。生產(chǎn)加工精密度用公差等級考量，等級值越小，其精密度越高；生產(chǎn)加工偏差用標(biāo)值表達(dá)，標(biāo)值越大，其偏差越大。
Machining plant emphasizes that machining must meet certain precision, which means that the actual geometry parameters of the steel parts after machining are consistent with the idealized values required by the part drawings. The level of inconsistency between them is called production-processing bias. There are three levels of manufacturing precision in a machining plant: On the one hand is the precision of the specifications, which limits the standard deviation between the production and the processing surface to be within the necessary range; on the other hand is the precision of the geometric patterns, limit the appearance deviation of macro-economic geometries, such as roundness, cylindricity, parallelism and straightness. On the other hand is the precision of each other's parts, limit the deviation between the two standard parts, such as coaxiality, flatness and parallelism, etc. . The precision of production processing is that the main parameters of the actual specification, shape and position of the surface layer of the parts are in line with the main parameters of the idealized geometry stipulated in the engineering drawings. The main parameters of an idealized geometric figure are, in the case of a specification, mean size; in the case of a surface geometric figure, circles, cylinders, plans, spheres, and parallel lines; and in the case of the mutual parts between the surfaces, it is said that the parallel plane, vertical, coaxial output, symmetry and so on. The offset of the main parameters of the actual geometry and the idealized geometry of the parts produced by the machining plant is called the production deviation. Production processing precision and production processing deviation is the evaluation of the production process surface geometric parameters of the main terms. The production process precision is considered by tolerance grade, the smaller the grade value, the higher the precision, and the production process deviation is expressed by standard value, the larger the standard value, the greater the deviation.