Accuracy is Precision machining Lifeline 。 If the accuracy fails to meet the requirements, it can only be scrapped 。 That ， During processing ， Want How to ensure the precision of precision machining ， All Machining of mechanical parts The operator must understand 。

　　 Stay Precision machining Core ， Machining of mechanical parts Generally required Want Use more than two knives 。 Reasonable arrangement of processing sequence ， It is beneficial to improve the machining accuracy 。 Stay Arrange Precision machining Second time ， The technological principle that must be observed is that the base surface is first 、 Before and after 、 First face then hole and first thick then fine 。

　　 The positioning of datum directly affects the arrangement of the back 。 The datum must be processed first ， In order to provide a positioning reference for the surface to be processed in the future 。 Datum of the first machining ， It may be the reference standard for the next machining surface 。 If the positioning datum of each processing procedure is roughly arranged ， You can step backward from the last process step by step Precision machining The next step. 。

　　 Stay Arrange Machining Before issue ， You also have to know if you need to Want Conduct Precision machining Preprocessing 。 If the workpiece is of high accuracy ， Reliable positioning ， Or enough machining allowance ， There is no need to pre process ， Directly according to the processing arrangement 。 Therefore ， To find out the reference accuracy of the blank 。 If you want to pre process ， Generally finished by machine tool 。

　　 Stay Machining of mechanical parts Time ， It is difficult to guarantee the standard between the machined surface and the non machined surface 。 If the drawing requires correct and wrong machining surface ， That Must Stay Leave enough allowance on the non machined surface of the blank ， Only in this way can Ensure Stay Machining Core Machining Time ， Make the standard between the non machined surface and the machined surface meet the drawing requirements 。

　　 If we do every detail well ， Ensure Precision machining It's not hard 。