The machining accuracy of hardware CNC lathes is mainly used to produce product grades. Machining accuracy and machining tolerance are terms used to evaluate the geometric parameters of the machined surface. However, the actual parameters obtained by any processing method are not accurate. According to the function of the part, as long as the machining error is within the tolerance range required by the part drawing, the machining accuracy can be guaranteed. Machining accuracy refers to the actual geometric parameters (size, shape and position) of the processed part.

1. Programming ability. CNC programming is the basic work of CNC machining. The quality of the machining program of the workpiece processed by the CNC lathe directly affects the machining accuracy and efficiency behind the machine tool. Proficiency in the use of machine tool programs can reduce the cumulative error of the CNC system. And flexibly use the main program and subroutine.

1. Flexible use of main programs and subprograms. In the processing of complex molds, multiple molds are usually used for processing. If there are multiple identical shapes on the mold, the relationship between the main program and the subprogram should be used flexibly, and the subprograms should be called repeatedly in the main program until the processing is completed. It can not only ensure the consistency of the processing size, but also improve the processing efficiency.

2. Reduce the cumulative error of the CNC system. Incremental programming is usually used to program workpieces. It is referenced by the previous processing. In this way, the continuous execution of the multi-level program will inevitably produce some cumulative errors. So when programming, try to use patterns to program, so that every piece is a magical tool. The origin can be used as a reference to reduce the cumulative error of the CNC system and ensure the machining accuracy.

2. Tool selection and correct installation. Whether it is CNC machining or ordinary machining, the tools are directly acting on the workpiece, so the selection and installation of the tools are a very important factor that affects the machining accuracy and surface quality of the workpiece. Especially the workpiece is processed in the CNC machining center, and the tools are pre-stored in the tool library. Cannot be replaced at will after processing. Therefore, the general principles of tool selection are: easy installation and adjustment, good rigidity, durability, and high precision.

3. Reasonably choose the cutting amount. The determination of cutting parameters is an important part of the CNC machining process. Its size is an important parameter of the main motion and feed motion of the machine tool. It has an important influence on the machining accuracy of the workpiece and tool wear. The cutting options include cutting speed, retract and feed. The basic selection principle is: rough machining requires a greater depth of cut to reduce the qualified number and increase the productivity of the workpiece; finishing usually uses a smaller depth of cut to obtain higher surface quality.