任何刀具在切削过程中都不可避免要产生磨损，并由此引起工件尺寸和形状地改变。刀具几何误差对天津机械加工误差的影响随刀具种类的不同而不同：采用定尺寸刀具加工时，刀具的制造误差会直接影响工件的加工精度；而对一般刀具(如车刀等)，其制造误差对机械加工误差无直接影响。

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