Traditional Culture Encyclopedia - Photography major - What do you mean by rail constraint?

What do you mean by rail constraint?

The assembly constraint of slider and guide rail is actually a translational motion parallel to the axis, and the other five degrees of freedom are limited by two constraints: axis alignment and rotation. According to the relevant information of the query, an object is restricted to move on a certain surface or curve, so we say that the movement of the object is restricted. Then the curve or surface is called a constraint.