1. First, measure the straightness error of the guide and the relative coordinates (offset) of each measuring point (the second guide is only fixed to the lower mounting table); then, use a level to measure the angle difference between the starting point and the end point of the two guides (the connecting parts are all tightened), and the height difference between the first and last points can be calculated by the angle difference and the distance in the length direction. Use a micrometer to measure the change in the horizontal parallelism of the first and last endpoints of the two guides.
2. The adjustment of the second guide must be based on the first (straightened) guide. The adjustment reference straight line of the guide must be parallel to the least squares midline of the reference guide (the ideal straight line reference of the reference guide) in the vertical direction, that is, the two ideal reference straight lines are coplanar (the two non-coplanar straight lines can be parallel when translated into a vertical plane). The two guides have their own coordinate systems, and the coordinate axes of the two coordinate systems are set to be parallel, that is, the two coordinate systems can be made to coincide by translation. The spatial position of the reference rail and the adjusted rail (the second rail). The line connecting the head and tail of the reference rail is AB, the least squares midline is CD, the line connecting the head and tail of the adjusted rail is straight line EF, and the actual curve of the adjusted rail is curve EF. To make the two rails parallel, it is necessary to find a straight line passing through the limit point in the coordinate system as the adjustment reference. The straight line must be parallel to the straight line CD in the coordinate system (the midline of the two-squares of the reference rail). The angle difference measured by the level gauge is the angle difference between AE and BF. The height of BI can be calculated based on the horizontal distance and angle difference between the two rails. The first step is to rotate EF to EK in the coordinate system, KF=BI, then EK is parallel to AB. The second step is to rotate EK to EG in the coordinate system, so that KG=AC-BD, then EG is parallel to CD. The third step is to make a straight line passing through the limit point and parallel to EG in the coordinate system. In this alignment example, the limit point of the plumb plane is the maximum value, so the adjustment reference straight line of the adjusted rail is EG. After determining EG, the adjustment amount corresponding to each point (the offset of each point on the curve EF relative to the straight line EG) can be calculated based on the coordinate value of the actual curve EF of the adjusted guide rail.