How does the slide seat of circular guide rail pass through the arc section smoothly?

The four rollers of the slide seat roll on the precise V-shaped surfaces on both sides of the arc-shaped guide rail, and the movement tracks of the centers of the two rollers on each side are concentric with the arc-shaped guide rail; The trajectories of two circular arcs on both sides are concentric; The movement tracks of the centers of the two rollers on each side are the same straight line; The two tracks on both sides are parallel and the distance between them is constant. When determining the relative position of the four rollers, it is equivalent to the intersection of two parallel straight lines and two concentric circular arcs (the intersection position is particular, and the motion characteristics of the transition stage need to be considered), and the distance between the two parallel straight lines is equal to the distance between the two concentric circular arcs, so that the four intersections are the positions of the roller centers; When the rollers are arranged in this way, the rollers and the guide rails are closely matched on the linear guide rail and the circular guide rail without gaps, so that the sliding seat and the linear guide rail/the circular guide rail are respectively closely matched.

In order to ensure that the carriage can smoothly pass through the arc section Vermaise in the transition stage, the two ends of each arc guide rail are specially processed, and the angle is slightly less than 180. The V-shaped guide rail surfaces on both sides near the ends are finely polished to form a special trajectory to ensure smooth engagement with the linear guide rail. More importantly, the function of this special trajectory is that the gap between the roller and the guide rail is very short, which is a gradual process rather than a sudden change, and the impact is well prevented. Even when the gap is the largest, the V-shaped guide rail is still stuck in the V-shaped groove of the roller, so the sliding table will not separate.