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).

有時制造廠家會使用進口的設備來制造精度等級高的訂單，或者所有訂單一起加工，再更終檢測時挑選出某一些達到高精度指標的，留下，按照高精度來賣，其余的就按照一般精度來賣。

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.

滾珠絲杠：分研磨級（C0、C1、C3，C5）和軋制級（C7，C10），越靠前越高。滾珠絲杠還有個“間隙”和“預壓”的概念，就不多說了，說多了就把人弄糊涂了，和精度等級也息息相關。你只需知道研磨級的絲杠（絲杠的接觸面是用絲杠研磨機磨出來的）一般常用的都是C3，C5級，軋制級的絲杠（絲杠的接觸面是用滾壓機滾軋出來的，所以精度要比研磨的差一些，但是造價低）一般常用的都是C7，C10級，就可以了。對比一下“e300”的值,后面數值單位是mm：C3 0.008C5 0.018C7 0.05C10 0.21直線導軌：精度等級范圍：普通級(N)、(H)、精密級(P)、超精密級(SP)，也有超高精密級(UP)。預壓等級范圍：輕預壓(FC)、中預壓(F0)、重預壓(F1)、超重預壓(F2)。同樣，上面“P”“SP”等字母代表的含義也只是相對的，不同廠家的含義可能不同，要參看該廠家的樣本說明，不同的等級對應的定位面尺寸公差和端面跳動等。

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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