Secondly there is error between the thread roll angles of thread rolling die and drill rod.

滚丝轮螺纹和钻杆螺纹的螺旋角有误差。

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This device is a new kind of drill rod fixture to be used with the rod storage to implement the mechanization of drill rods connection for drill rigs.

该机构是一种新型的接卸钻杆机构，其与贮杆器配合使用可使钻机实现机械化接卸钻杆。

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The advanced hydraulic system has self-return and drill rod stuck proof implements, which ensure great maneuverability and reliability.

先进的液压系统有自我的回报和钻杆坚持证明实施，确保伟大的机动性和可靠性。

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As the head of the company, Hayward became a lightning rod for public and political anger after the drill rig operated by BP exploded in the Gulf of Mexico in April.

CNN: BP's Hayward: Oil spill wasn't because of cost-cutting