General Engineering Knowledge - How Sighting, Boring and Alignment of Ship's Propeller Shaft Is Done (marineinsight.com)
Learn how sighting and boring of the ship's stern tube is done for proper alignment of propeller shaft.
The main engine of a ship is coupled to the propeller by means of a shaft. The translational motion of the pistons induces a rotatory motion on the crankshaft, which is in turn, coupled to the propulsion shaft. The shaft then passes through the stern tube. At the aft end of the shaft, and outside the stern tube, is coupled, the propeller.
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