The concept of evaluation error of the mainshaft rotary precision for turning machines defined with rotary center error and that for boring machines defined with rotary axle center are presented.
提出了用回转中心误差定义的车削类主轴回转运动精度的评定误差和用回转轴心误差定义的镗削类主轴回转运动精度的评定误差的概念。
In order to avoid the pollution caused by slurry around bridge-building sites, they use dry-boring by rotary drills where possible.
桥梁施工中为减少泥浆对桥位处的环境污染，尽量采用旋转钻机干法成孔。
In order to avoid the pollution caused by slurry around bridge-building sites, they use dry-boring by rotary drills where possible.
桥梁施工中为减少泥浆对桥位处的环境污染，尽量采用旋转钻机干法成孔。
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