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我厂在磨床上利用双顶尖磨削一批抽油泵心轴时(图1),发现几乎每件都有程度不同的椭圆。粗磨时(余量在0.5～0.6mm)椭圆度误差在0.015～0.02mm,精磨(余量0.1mm左右)后仍存在0.005～0.01mm圆度误差。
I plant in the use of grinding machine double top grinding a number of pump shaft (Figure 1), found that almost every degree of elliptical. Roughness (margin of 0.5 ~ 0.6mm) ovality error of 0.015 ~ 0.02mm, after grinding (balance of about 0.1mm) still exist 0.005 ~ 0.01mm roundness error.