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The paper presents methods of aligning propulsion shafting using load cells for direct bearing reaction measurement and procedures for shafting alignment by measurement of shaft bending moments with strain gages. Additionally, a unique means of measuring reduction gear and stern tube bearing reactions is described. CURREN T PROCEDURES for main propulsion shafting alignment are well documented and in constant use at shipyards and repair facilities. With smaller vessels the gap and offset method is convenient and yields satisfactory results. In large vessels, where disassembly of couplings is not practical, the practice is to measure the shaft weight supported by all accessible bearings on the shaft, using the "jack check" method for determining bearing reactions. This paper introduces alternative methods of achieving the desired shafting alignment, utilizing electronic load cells for the direct measurement of bearing loads. Additional methods incorporating strain gages for both lateral and vertical alignment are discussed. Finally, for measuring bearing reactions within a reduction gear box or stern tube, a method based on external measurements is described.
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