support unit can be used in the fixed end and the support end of the screw respectively to fix the screw inn the correct position.
The support unit used in fixed end of the screw is a pair of angular ball bearings in face-to-face arrangements (DF), which can effectively carry axial load of the screw. Due to its face to face arrangement, the unit can absorb calibration of the screw for the convenience of assembly. As the support unit used by support end of the screw is adopted 6 series deep groove ball bearings, which can effectively support the screw and control screw radial a stable position.
