When purchasing users choose horizontal machining centers with different precisions, they need to consider: the meaning of unit length corresponding to different specifications; Pay attention to the goal of milling accuracy; Differential machining accuracy and machine tool accuracy.

The accuracy class of the machining center is first and foremost determined by the accuracy of the critical parts of the typical part. Its accuracy mainly includes positioning accuracy, repeated positioning accuracy and milling accuracy, especially repeated positioning accuracy, which reflects the positioning stability of the coordinate axis and is the basic goal of measuring whether the axis works safely and reliably.

It is particularly noteworthy that it is necessary to analyze when selecting and ordering, and cannot simply look at the accuracy values listed in the product sample, because the specifications are different, the rule values are different, and the detection methods are different, and the meaning of the values is different. Most of the positive and negative values (generally plus or minus 0.05) on the unit length listed in publications, samples, and certificates of conformity are not clear, and we should pay special attention when purchasing.

Milling accuracy is one of the primary goals to comprehensively evaluate the servo following motion characteristics of CNC axes and the interpolation function of CNC system of machining centers. Whether or not a typical part has this requirement, it is necessary to pay attention to this goal for the sake of possible future needs and better control of accuracy.

Horizontal machining centers need to pay attention to two different concepts: differential machining accuracy and machine tool accuracy. It is wrong to regard the azimuth accuracy on the manufacturer's sample or the product certificate as the machining accuracy of the machining center. The azimuth accuracy indicated on the sample or certificate is the accuracy of the machining center itself, and the machining accuracy is the sum of the errors caused by various factors of the entire process system, including the error promised by the machining center itself. The causes of errors in the entire process system are very messy and difficult to quantitatively express with linear relationships. When selecting, you can refer to the identification method of the process talent coefficient Cp as the selection basis for the machining accuracy of the machine tool.