Inspecting centerline positioning for shaft system and rudder system before boring.

轴、舵系镗孔前中心线定位检查。

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First you need the boring for the shaft, then install the stern tube into the stern frame, next fit the gun-metal or white-metal bush.

首先要镗孔，然后安装尾轴管，接下来装炮铜或白合金制的轴承套，也叫轴承。

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Optical aligned check for shaft system after boring.

轴系镗孔后光学校中检查。

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