比如在准星后面增加一条延长线，可以很大程度上提高精度降低散布。
If a line begins to fall behind, they can always increase accuracy and reduce spread.
主轴在轴承上运转的平稳性直接影响工件的加工质量，一旦主轴的旋转精度降低，则机床的使用价值就会降低。
Spindle bearing on the stability of operation in direct influence on the processing quality, once the spindle rotation precision decrease of the machine tool use value will be low.
轴承在工作中，由于外界或内在因素的影响，使原有配合间隙改变，精度降低，乃至造成“咬死”称为游隙变化失效。
Bearing in the work, because of external or internal factors, with the gap so that the original change, lowering the precision, and even lead to "killed" clearance changes as failure.
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