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The drill string is rotated by rotary table.
钻柱是由转盘驱动的。
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Position permanent guide base (PGB) below rotary table.
在转盘下安放永久导向基板。
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Remove breaker and carefully lower bit through rotary table.
卸掉卸扣器，下放钻柱让钻头缓慢通过转盘。
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Remove breaker and carefully lower bit through rotary table.
卸掉卸扣器，下放钻柱让钻头缓慢通过转盘。
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