Since the 1970s, the rapid development of precision machining centers, there has been replaceable spindle box processing center that comprises a plurality of automatic multi-axis spindle box equipped with a replaceable tool, the workpiece can be processed simultaneously porous. However, in 1958, he started to develop our CNC lathe, a successful trial with sub-pipe system CNC CNC lathes, began mass production in 1965 with a transistor coordinate CNC milling machine CNC system. After decades of development, the current CNC lathes and computer control has been achieved in the industry has been widely used application in the mold manufacturing industry is particularly popular how to do routine maintenance of precision parts machining, refer to the following methods:
　　First, the operator leaves the machine, speed, adjustment, replacement of the workpiece and the cutter, should be shut down.
　　Second, according to machining precision CNC engraving and milling machine lubrication chart provisions refueling, check the oil standard oil, oil is smooth, clean maintain lubrication system, oil cup, oil can not open eyes. Each part of the screws to be tightened.
　　Third, is strictly prohibited to wear gloves when operating the machine operation, are not allowed to hand pull iron.
　　Fourth, before starting, you should wear a good anti-labor supplies.
　　Fifth, the electrical machine will be allowed to replace, to prevent electrical accidents.
　　Sixth, when the machine failure or abnormal, should immediately stop excluded.
　　Seven, for the time, thought to be highly concentrated, absent without leave, chatting or reading the newspaper when the power is strictly prohibited.
　　However, when using precision parts machining, basically it will be used in ultra-fine grinding. Ultra-fine grinding wheel working surface can be trimmed by a large number of high-abrasive characteristics of this micro blade to be carried out, and some high micro blade cut from the work surface meager, still has some defects and trace trace The shape and size of the error and the balance. Therefore, the use of these and other micro-cutting tools is a lot of, if appropriate grinding parameters, precision parts processing surface may leave a large number of very fine traces of cutting, so get a very low surface roughness. In addition, since no fire spent grinding stage, there is still very clear to friction, slip squeeze, polishing and calender effects, making it ultra-precision parts machining surface roughness is further reduced.
　　In large construction machinery factory machining precision parts grinding surface roughness Ra0.02--0.04μm, precision h4 - h5 when journal, precision machining parts are carried out on an expensive high-precision grinding. General construction machinery repair factory but no high-precision grinding, grinding to such a low surface roughness, such a high precision journal is very difficult.