The basic definition of the accuracy grade of the screw guide rail of NC machine tool is not very clear. It generally means to reflect the different differences between the positioning surface of the linear guide rail and the reference plane, or the repeated positioning accuracy of the lead screw under the condition of different matching clearances of the rolling element and related components. If you can understand the role of ball screw in servo system and linear guide rail in precision guiding elements, the concept of "accuracy level" is not difficult to understand. In short, it is used in equipment with different accuracy requirements. The higher the accuracy level, the more precise the equipment can be used, It can make the positioning accuracy and processing accuracy that the equipment itself can achieve higher. Of course, the price is also higher (because the greater the difficulty in manufacturing and assembly, the higher the cost).

有时制造厂家会使用进口的设备来制造精度等级高的订单，或者所有订单一起加工，再更终检测时挑选出某一些达到高精度指标的，留下，按照高精度来卖，其余的就按照一般精度来卖。

Sometimes manufacturers will use advanced imported equipment to manufacture orders with high precision, or all orders will be processed together, and then some orders that meet the high precision index will be selected during the final inspection, left and sold according to the high precision, and the rest will be sold according to the general precision.

滚珠丝杠：分研磨级（C0、C1、C3，C5）和轧制级（C7，C10），越靠前越高。滚珠丝杠还有个“间隙”和“预压”的概念，就不多说了，说多了就把人弄糊涂了，和精度等级也息息相关。你只需知道研磨级的丝杠（丝杠的接触面是用丝杠研磨机磨出来的）一般常用的都是C3，C5级，轧制级的丝杠（丝杠的接触面是用滚压机滚轧出来的，所以精度要比研磨的差一些，但是造价低）一般常用的都是C7，C10级，就可以了。对比一下“e300”的值,后面数值单位是mm：C3 0.008C5 0.018C7 0.05C10 0.21直线导轨：精度等级范围：普通级(N)、(H)、精密级(P)、超精密级(SP)，也有超高精密级(UP)。预压等级范围：轻预压(FC)、中预压(F0)、重预压(F1)、超重预压(F2)。同样，上面“P”“SP”等字母代表的含义也只是相对的，不同厂家的含义可能不同，要参看该厂家的样本说明，不同的等级对应的定位面尺寸公差和端面跳动等。

Ball screw: it is divided into grinding stage (C0, C1, C3, C5) and rolling stage (C7, C10). The higher the front, the higher. The ball screw also has the concepts of "clearance" and "preloading", so I won't say more. If I say more, I'm confused, which is also closely related to the accuracy level. You only need to know that the grinding level lead screw (the contact surface of the lead screw is ground by the lead screw grinder) is generally C3 and C5, and the rolling level lead screw (the contact surface of the lead screw is rolled by the roller, so the accuracy is worse than the grinding, but the cost is low) is generally C7 and C10. Compare the value of "E300". The unit of the following value is mm: C3 0.008c5 0.018c7 0.05c10 0.21 linear guide rail: precision grade range: ordinary grade (n), advanced grade (H), precision grade (P), ultra precision grade (SP), and ultra-high precision grade (up). Preloading grade range: light preloading (FC), medium preloading (F0), heavy preloading (F1) and overweight preloading (F2). Similarly, the meanings represented by the above letters "P" and "SP" are only relative. The meanings of different manufacturers may be different. Please refer to the sample description of the manufacturer, the dimensional tolerance and end face runout of the locating surface corresponding to different grades, etc.

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