Here are the experts to tell you about the advantages of the guide screw:

一自动调心能力

First automatic alignment capability

来自圆弧沟槽的DF(45-°45)°组合，在安装的时候，藉由钢珠的弹性变形及接触点的转移，即使安装面多少有些偏差，也能被线轨滑块内部吸收，产生自动调心能力之效果而而得到高精度稳定的平滑运动。

The DF (45-

第二具有互换性

The second is interchangeability

由于对生产制造精度严格管控，直线导轨尺寸能维持在一定的水准内，且滑块有保持器的设计以防止钢珠脱落，因此部份系列精度具可互换性，客户可依需要订购导轨或滑块，亦可分开储存导轨及滑块，以减少储存空间。

Due to strict control of manufacturing accuracy, the dimension of linear guideway can be maintained at a certain level, and the slider has retainer design to prevent steel beads from falling off. Therefore, some series of accuracy can be interchangeable. Customers can order guideways or sliders as needed, and can store guideways and sliders separately to reduce storage space.

第三所有方向皆具有高刚性

Third, all directions have high rigidity

运用四列式圆弧沟槽，配合四列钢珠等45度之接触角度，让钢珠达到理想的两点接触构造，能承受来自上下和左右方向的负荷；在必要时更可施加预压以提高刚性。

Using quadrilateral arc groove and 45 degree contact angle of four rows of steel beads, the steel beads can reach the ideal two-point contact structure, which can withstand loads from the upper and lower directions and from the left and right directions. When necessary, preloading can be applied to improve rigidity.

STAF直线导轨的挑选应该注意什么问题呢？

What should we pay attention to when selecting STAF linear guide?

为您阐述导轨的应用领域：

Firstly, the application fields of guideways are described for you.

直线导轨主要用在自动化机械上比较多,像德国进口的机床,纸碗机,激光焊接机等等,当然直线导轨和直线轴是配套用的。

Linear guides are mainly used in automation machinery, such as machine tools imported from Germany, paper bowl machines, laser welding machines and so on. Of course, linear guides and straight axles are matched.

直线导轨主要是用在精度要求比较高的机械结构上,直线导轨的移动元件和固定元件之间不用中间介质，而用滚动钢球。因为滚动钢球适应于高速运动、摩擦系数小、灵敏度高，满足运动部件的工作要求，如机床的刀架，拖板等。如果作用在钢球上的作用力太大，钢球经受预加负荷时间过长，导致支架运动阻力增大。

Linear guides are mainly used in mechanical structures with high accuracy requirements. Rolling steel balls are used instead of intermediate between moving and fixed components of linear guides. Because rolling steel ball is suitable for high-speed movement, small friction coefficient and high sensitivity, it meets the working requirements of moving parts, such as tool holder, trailer, etc. If the force acting on the steel ball is too large, the steel ball will endure the preload for too long, which will lead to the increase of the bracket resistance.

其次是它的型号及选择：

Secondly, it's model and choice:

（一）确定轨宽。

(1) Determining the rail width.

轨宽指滑轨的宽度。轨宽是决定其负载大小的关键因素之一，四排滚珠（也有部分两排珠的）的。

The rail width refers to the width of the slide rail. Rail width is one of the key factors to determine the size of its load. Four rows of balls (some two rows of balls).

（二）确定轨长。

(2) Determining the track length.

其长度是轨的总长，不是行程。全长=有效行程+滑块间距（2个以上滑块）+滑块长度×滑块数量+两端的行程，如果增加了防护罩，需要加上两端防护罩的压缩长度。需要注意的是，事先问清楚该规格导轨整支的较大长度，超过这个长度是需要对接使用的。多数厂家整支长度较大是4000（微轨一般是1000），有些是3000，这和厂家的加工设备有关。需要对接并且用户想事先在机器上加工安装孔的情况下较好提供接口图纸。另一点请特别注意，导轨上的安装孔孔间距是固定的，用户在确定轨长时要注意位置，例：15的轨，长600。如果不告诉供应商需要的端部尺寸，一般到货的状态是10个安装孔，导轨两端面到各自较近的安装孔中心的距离是30、30，但也有可能是其他尺寸。各对端部尺寸的出货规定略有差异，多数是默认两端相等。还有一点，导轨的长度误差，一般默认2000以下±1~2mm，2000~4000的±2~3mm，如果用户要求比较精确，较好在订购合同上注明误差值或提供图纸。这种情况供应商可能会收取附加加工费。

Its length is the total length of the track, not the journey. Full length = effective travel + slider spacing (more than 2 sliders) + slider length * number of sliders + safe travel at both ends. If the protective cover is added, the compression length of the protective cover at both ends should be added. It should be noted that the maximum length of the whole guide rail of this specification should be ascertained beforehand. It is necessary to use docking if the length exceeds this length. Most manufacturers have a maximum length of 4000 (microrails are generally 1000) and some 3000, which is related to their processing equipment. It is better to provide interface drawings when docking is required and the user wants to process installation holes on the machine beforehand. Another point please pay special attention to is that the distance between the installation holes on the guide rail is fixed. Users should pay attention to the position when determining the length of the rail, for example, the length of the rail of 15 is 600. If you do not tell the supplier the required end size, the general arrival status is 10 installation holes, the distance between the two ends of the guide to the center of their nearest installation holes is 30, 30, but it may be other sizes. Each brand has slightly different delivery requirements for end sizes, most of which are the same at both ends by default. Another point is that the length error of the guide rail is generally less than 2,000 (+1~2 mm) and 2,000 (+2~3 mm) by default of the brand. If the user requests more precise, it is better to indicate the error value or provide drawings in the order contract. In this case, suppliers may charge additional processing fees.
                                              

（三）确定滑块类型和数量。

(3) Determine the type and number of sliders.

常用的滑块是两种：法兰型，方形。前者高度低一点，但是宽一点，安装孔是贯穿螺纹孔，后者高一点，窄一点，安装孔是螺纹盲孔。两者均有短型、标准型和加长型之分（有的也称为中负荷、重负荷和超重负荷），主要的区别是滑块本体（金属部分）长度不同，当然安装孔的孔间距也可能不同，多数短型滑块只有2个安装孔。滑块的数量应由用户通过计算确定，在此只一条：少到可以承载，多到可以安装。滑块类型和数量与滑轨宽度构成负载大小的三要素。

There are two kinds of sliders in common use: flange type and square type.  The former is lower in height, but wider in width. The installation hole is through the threaded hole. The latter is higher and narrower, and the installation hole is blind hole. Both of them are short, standard and lengthened (some brands are also called medium load, heavy load and overload). The main difference is that the length of the slider body (metal part) is different. Of course, the hole spacing of the installation holes may also be different. Most of the short sliders have only two installation holes. The number of sliders should be determined by the user through calculation. Here only one item is recommended: less to be able to bear, more to be installed. The type and number of sliders and the width of slides constitute the three elements of load size.