How do we determine the diameter of the optical axis?

First of all, determine the existence of the load center of gravity and the wire center, if the two are overlapping, or to choose a thin diameter of linear optical axis; if the two states are parallel, then the opposite reaction to choose a larger diameter of the product. The major axis
At the same time, we should also judge the actual situation of the device in which the optical axis of a straight line is located, if its travel is relatively small and deviates from the optical axis with a smaller diameter; if the travel is relatively large, we need to choose the optical axis with a larger diameter, mainly in order to increase its friction.
In addition, the installation of both ends of the linear optical axis and the lead screw is also one of the factors determining its diameter, if fixed installation, the diameter of the thin linear optical axis; if installed in a flexible way, the thick linear optical axis can meet the requirements. Referring to the above points, we can usually get the straight optical axis matching the actual situation.