The theoretical reference straight line of the reference guide rail is a straight line in space, so it is straightened on two mutually perpendicular planes (horizontal plane and vertical plane). During the alignment process, the straightness error is also measured in these two planes. The setting of coordinate system is the same as the measurement system.

由于導軌是剛性件，撓度較小，校直幅度不能過大，所以，校直的過程中，直線度誤差的計算采用小二乘法。在校直的過程中，是以小二乘中線作為基準直線。在校兩條導軌平行程度時，也是采用小二乘中線為基準。導軌和導軌基座的接觸是面接觸，導軌靠基座上的相互垂直的平面進行定位。校直中，基座接觸面增加材料（墊薄片材料）遠比去除材料（磨削或刮研）容易，所以，本校直實例采用增加材料（墊薄片材料），但只能達到數絲的精度（墊薄片材料厚度限制），要達到高的精度則需要用去除材料的方法。

As the guide rail is a rigid part, the deflection is small, and the straightening range cannot be too large. Therefore, during the straightening process, the straightness error is calculated by small two multiplication. In the process of straightening, the minor two times the center line is used as the reference line. When checking the parallelism of the two guide rails, the minor two times the center line is also used as the benchmark. The contact between the guide rail and the guide rail base is surface contact, and the guide rail is positioned by the mutually perpendicular planes on the base. In the alignment, it is much easier to add materials (pad sheet materials) to the contact surface of the base than to remove materials (grinding or scraping). Therefore, in this alignment example, the added materials (pad sheet materials) are used, but only the accuracy of several threads (the thickness limit of pad sheet materials) can be achieved. To achieve high accuracy, the method of removing materials is required.

校直過程中的基準直線實際是平行基準導軌小二乘中線并且通過極限點的直線。由于以基準導軌小二乘中線為基準線，為調整方便，選取平行基準線并且通過極限點的直線作為調整的基準，然后計算出各測點相對該調整基準直線的偏移量，按其偏移量進行調整。本校直例中，鉛垂面的極限點就是大值；水平面的極限點就是上側導軌的大值或下側導軌的小值（去除材料（磨削或刮研）定義極限點是大值和小值互換）。既是以平行小二乘中線且通過該極限點的直線為基準時，調整導軌只需墊薄片材料。

The reference straight line in the straightening process is actually a straight line parallel to the small two times the center line of the reference guide rail and passing through the limit point. Since the small two times the center line of the reference rail is taken as the reference line, the straight line parallel to the reference line and passing through the limit point is selected as the reference line for adjustment, and then the offset of each measuring point relative to the adjustment reference line is calculated and adjusted according to its offset. In this straightening example, the limit point of the vertical plane is the large value; The limit point of the horizontal plane is the large value of the upper guide rail or the small value of the lower guide rail (the limit point defined by material removal (grinding or scraping) is the interchange of the large value and the small value). When the straight line that is parallel to the minor two times the center line and passes through the limit point is taken as the reference, the adjusting guide rail only needs to be padded with sheet material.

具體如下：1.確定基準導軌（由工藝師或生產廠家決定）并進行校直，使其直線度誤差的值在規定的范圍內；

The details are as follows: 1. Determine the reference guide rail (determined by the technologist or the manufacturer) and straighten it to make its straightness error within the specified range;

2.采用上述的方法校直第二條導軌。以校直好的基準導軌作為基準直線，使第二條導軌的小二乘中線和基準導軌的小二乘中線達到規定的平行度誤差。

2. Straighten the second guide rail by the above method. Take the straightened reference guide rail as the reference straight line to make the minor two times center line of the second guide rail and the minor two times center line of the reference guide rail reach the specified parallelism error.

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