采用单向趋近定位方法，避免传动系统反向间隙而产生的定位误差。
The positioning method, avoid approaching the one-way transmission system from the reverse clearance positioning error.
高定位 ：零回转间隙和更高的刚度建设。
High Positioning : Zero backlash and higher stiffness construction.
第二种适用于特殊全封闭的轴承，其一头有间隙并有定位螺丝孔。
The second applies to a special closed-wide bearings, which have a gap and a positioning screw holes.
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