... . Therefore, and parallel use a pair of straight line roller liner, compared to achieve a more compact ... fixed load, the ball was designed to 45 ° line up of the antenna, and of course use what ... fixed load, the ball was designed to 45 ° line up of the antenna, and of course use what ... linear bearings, steel cage linear bearing, stainless steel straight axis, linear optical axis, hollow shaft, ball screw ...