For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is correct. The length of the motor shaft between its bearings is the resistance arm. Avace mafactri office the importance of motor shaft alignment the objective of optimized shaft alignment is to increase the operating life span of rotating machinery. Propulsion shaft alignment method and analysis for surface. Measure and correct alignment of the machine to achieve the final alignment to the required targets within tolerances. Our main aim is to study its design procedure along with finite element analysis some important parameter will be obtained. Rotating machinery is the heart of many industrial operations, but many engineers and technicians perform shaft alignment by guesswork or with limited knowledge of the tools and methods available to accurately and effectively align their machinery. Easylaser is a cost effective investment that will pay. Machine alignment for maintenance personnel in drinking water and wastewater facilities. In the pump business alignment means that the centerline of the pump is. Modelling of propulsion shaft line and basic procedure of shafting alignment calculation. A misalignment of these three components as small as 0.
The objective of shaft alignment is to minimize coupling forces by making two rotational axes form a single line while the machine operates. This invention relates to a method of shaft alignment of a main engine shaft in shipbuilding. Shaft alignment definition most shipboard configurations of shafts and bearings are likely to be aligned when some or all of the centrelines of the bearings are offset from the theoretical straight line condition, so as to achieve an acceptable bearing load distribution and shaft slope. Sep 15, 2009 the shaft log is the tube that allows the shaft to penetrate the hull, with the stuffing box or shaft seal at one end, and typically a bronze and rubber shaft bearing within. We provide 20 for you about propeller shaft alignment procedure in a boat page 1. Pdf modelling of propulsion shaft line and basic procedure. To provide an overview of alignment, the discus sion in this. The data validity rule 1 shown in following equation.
Number what is shaft alignment 6 a definition 6 machine catenary 7 operation above critical speed 8 expressing alignment 10 alignment parameters 10 angularity, gap and offset 11 short flexible couplings 14 spacer shafts 15 how precise should alignment be. The primary reasons why machinery is misaligned is lack of proper training, improper tools to do the job, and that people are not given enough time to do it right. Mobileereaders download the bookshelf mobile app at or from the itunes or android store to access your ebooks from your mobile device or ereader. To achieve this goal, components that are the most likely to fail must be made to operate within their acceptable design limits. At a yard i once managed, i clearly recall watching a contractor, who specialized in this work, take a decidedly seatofthepants approach to calculating shaft weight and the associated sag or droop. Design and optimization of automobile propeller shaft with. Nov 19, 2015 as found shaft alignment results figure 1. The bent shaft affects alignment process by showing improper reading.
However, it they are left tight against the feet, some unexpected problems may occur. Measurement of gapsag for flange coupling main engine intermediate shaft. Jul 26, 2014 alignment procedure taking alignment readings step no. Regarding john gross question about how a shaft can be aligned with so many things being so wobbly. During a recent training class at an ohio steel mill, we went out to check the alignment on a blower fan that had been. Here you can download the pdf template of the tksa 20 shaft alignment report, which can be used for documenting of your alignment activities. St1 926470000 axle shaft puller st2 28099pa110 axle shaft puller plate 15 after scribing an alignment mark on camber ad. Measure, diagnose, and correct soft foot with the assistance of the laser system and feeler gauges. That is the fundamental philosophy behind our measurement systems.
Entirely new chapters explore bore and parallel alignment. Providing detailed guidance based on years of handson experience, the shaft alignment handbook, third edition is a practical tool to help avoid costly shutdowns, dangerous failures, and early replacements. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is. Shaft alignment software in nauticus machinery for optimal propeller shaft alignment and natural frequencies for whirling and axial vibrations.
Jun 08, 2011 this centers the shaft in the shaft log and gets rid of the wiggle, assuming your cutless bearing was recently replaced. A practical guide to shaft alignment plant services. Prop shaft alignment yearly maintenance item if this is your first visit, be sure to check out the faq by clicking the link above. The importance of motor shaft alignment department of energy. Heretofore, the sighting for shaft alignment of the main shaft of the main engine has been performed after completion of the stern construction and before installation of the main engine. Shaft aligning procedure preliminary checks visually check coupling, pipe hangers, base bolts, coupling spacing etc. A simple and effective procedure for doing shaft alignment of rotating machinery. Omc cobra volvo penta sx engine alignment procedure duration. A guide to shaft alignment achieving a satisfactory shaft alignment is paramount for the safe and reliable operation of a ship during its lifetime. Shaft aligning techniques shaft alignment by conventional method shaft alignment by dial test indicator dti shaft alignment by using laser equipment shaft alignment by using computer. Shaft misalignment is the usual culprit behind high levels of machine vibrations and premature bearing fatigue. Once the shaft is removed and new cutlass bearings in place you could use a laser to check the alignment, but when you push the shaft back in, you certainly feel if one of the bearings is off center.
For maintenance personnel in drinking water and wastewater. Misalignment will cause severe shaft or sleeve fretting if you use spring loaded. This laser reference beam passes through the strut tube or cutlass bearing, the stern tube, support bearings, if any, and to the engine or reduction gearbox. The proper shaft alignment procedure is to secure the. A method of shaft alignment of a main engine shaft in shipbuilding comprising the steps of boring the main engine shaft along the center of the shaft, installing a main engine after a bottom construction has been completed and before a stern frame and an upper portion of the engine room has been built, sighting the shaft line of the main engine through the bore of the main engine. To keep standard rotating machines running smoothly, industrial maintenance personnel must stay updated with various alignment tools and methods. Initial alignment condition laser alignment report angular misalignment offset misalignment mils per inch mils. One on the ccgs earl grey, and the other on the hmcs huron. Download shaft alignment handbook third edition by john. Due to the design and construction of the drive shaft and universal joint assembly, the replace ment of any part or parts can be. Trouble free and flexible modelling of the shaft line.
Asset uptime begins with precision shaft alignment misalignment in rotating machines can cause a number of problems from production losses to unplanned downtime to increased maintenance costs. Looking for propeller shaft alignment procedure in a boat. To the right you can see the procedure for measurement of a horizontal machine. Discussion in inboards started by holdfast, mar 17, 2014. Procedure for shaft alignment engineering tolerance. The book is reference material on rotating machinery basics, pump overhaul, mechanical seals, basic vibration, and shaft alignment. Running gear alignment professional boatbuilder magazine. Shaft alignment handbook by john piotrowski, piotrowski. Shaft alignment handbook 3rd edition the 3rd edition of the shaft alignment handbook is the most comprehensive book ever written on the subject of aligning rotating machinery. Lloyds register emeas technical investigations provides a comprehensive range of measurement and advisory services to help owners, operators and yards to help to ensure that the best.
The shaft log is the tube that allows the shaft to penetrate the hull, with the stuffing box or shaft seal at one end, and typically a bronze and rubber shaft bearing within. Propeller shaft alignment forward alignment approach. Apr 21, 2017 there is another side to the alignment story. For instance, if the inner diameter of the shaft log is 1. Installation and support introduction the shaft alignment program calculates and records the shaft alignment correction between a driver and driven machine for either basemounted or flangemounted drivers. Pump alignment report format free download as word doc. This paper presents an approach to determine the changing displacement of the propulsion shaft due to the vessels hull deflection. Vibration wear energy usage proper alignment increases reliability. The model considered is a 60 m long shafting system of a ship consisting of 10 bearings, one gearbox and one main engine. Prop shaft alignment yearly maintenance item page 3. The alignment of shaft with the bearing and housing, which is a manufacturing tolerance stackup of the bearing parts and the housing bores and faces.
Jacking bolts provide an easy and accurate way to horizontally position a motor during a shaft alignment. Prop shaft alignment yearly maintenance item moomba. It is an absolute requirement for machinery before the. You must first take the wobble out of it, then align the coupling flange on. Many consider runninggear alignment to be a black art. Sighting through as part of shaft alignment procedure eliza jaryszkami ska west pomeranian university of technology, szczecin, institute of manufacturing engineering, al. Shaft alignment is the act of measuring the relative position of two machines that are coupled and repositioning them so that the rotational axes of the two shafts form a straight line collinear when the machines are at normal. Shaft alignment is the process of aligning two or more shafts with each other to within a tolerated margin. While engine alignment is well understood by most marine industry professionals, shaft alignment is far more esoteric and well understood by far fewer folks in the industry. The simple mounting system and straightforward user interface make the easylaser e420 easy to learn, easy to understand and easy to use. The shaft alignment program calculates and records the shaft alignment correction between a driver and. Practice alignment procedure when one or both shafts are locked practice alignment when one or both shafts have limited rotation. Shaft alignment handbook mechanical engineering piotrowski, john on. Service bulletin propeller gearbox alignment procedure description the alignment of your engine, engine mounting plate, and propeller gearbox is critical for a smooth running and long lasting gearbox.
Here you can find the latest products in different kinds of propeller shaft alignment procedure in a boat. Check the prerequisites for a correct alignment before aligning, e. An essential component of any successful alignment procedure is the. This single source reference offers a comprehensive analysis of coupled rotating machinery systems, providing practical guidelines for solving complex alignment tasks fast and accurately.
Case studies bruce cowper1, al dacosta2, stephen bobyn3 two case studies are presented in which measurement and modeling programs were undertaken to assess the installed shaft alignment condition on marine vessels. Design process the classic alignment technique would. Com is a knowledge management km consulting based maritime service provider being established among experienced and skilled professionals in the naval, maritime and offshorerelated services for more than 50years, having a vision and. Click to download the upgrade package zip file, 47mb. The objective of optimized shaft alignment is to increase the operating life span of rotating machinery. Practice and learn different shaft alignment methods using dial indicators or lasers. Keep track of machinery status with vibration level check.
This alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. The natural deformation of shaft sections is taken into account with rational alignment programmes and coupling conditions can be used to position shaft sections and to check alignment. Pdf basic shaft alignment workbook for industrial rotatin. Laser alignment report condition monitoring, shaft. Fortunately, resolving these alignment issues has gone hightech, too.
1291 1018 1045 857 416 748 1356 70 653 1162 1568 237 179 1358 750 966 114 695 805 1074 180 1690 1579 631 652 1133 1055 499 200 895 1654 106 625 1203 1037 688 126 258 812 1467