To achieve this goal, components that are the most likely to fail must be made to operate within their acceptable design limits. Measure, diagnose, and correct soft foot with the assistance of the laser system and feeler gauges. For instance, if the inner diameter of the shaft log is 1. 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. By aligning the engine correctly, it should last much longer along with the transmission and prop shaft. Whether you are using dial indicators or a laser alignment tool if you are in the market for either, we have several options here, being able to achieve an accurate, repeatable alignment is key. Just the thought of having to remove the floor is intimidating.
Special brackets are available for alignment with locked rotors to increases the safety of the operator. When the boat is running and the propeller spinning, the shaft will align itself but not if the basic alignment is out. Shaft alignment methods explained bright hub engineering. Engine alignment must be rechecked with boat in the water, fuel tanks filled and with a normal load on board. Standard procedure propeller shaft angle you can use a socket and angle gauge in place of the inclinometer 1 place transmission in neutral. The model considered is a 60 m long shafting system of a ship consisting of 10 bearings, one gearbox and one main engine. It is a little bit more complicated than usual as each shaft has four supporting points. Alignment report hung seng huat engineering product co. Heres a short list of the problems associated with incorrect alignment and poor or worn out engine mounts. The measurement method is based on a laser transmitter being mounted on the. The procedure for doing reverse dial indicator alignment is not a difficult one.
Good shaft alignment practice should be a key strategy in the. Design optimization of automotive propeller shafts. Knowing how to perform a precision shaft alignment is important when it comes to maintenance skills. Furthermore, the water integrity of the ship is maintained by the stern tube seal and the propeller shaft. Aim to have all soft foot readings within 2 mils thou. A machine properly aligned will be a reliable asset to the plant, it will be there when it is needed and will require less scheduled and unscheduled maintenance. The objective of optimized shaft alignment is to increase the operating life span of rotating machinery. Agnee gear motors, gear boxes and 3d printers 9,733 views. Design and optimization of automobile propeller shaft with. Reinove the propeller shaft froin the truck by taking out four capscrews at each end holding the flange type bearings to the fitting yokes, being careful not to let the flanged bearings fall off and perinit foreign inatter to enter the rollers. Any type of alignments are wanted two fixed center. Bearing clearance and slope verification procedure.
Here you can find the latest products in different kinds of propeller shaft alignment procedure in a boat. Prop shaft alignment yearly maintenance item if this is your first visit, be sure to check out the faq by clicking the link above. Pdf analysis of ship shaft line coupling bolts failure. Installation procedure and verification data with tolerances e.
Thanks to flexible brackets you can install the equipment in the most appropriate place. Modelling of propulsion shaft line and basic procedure of shafting alignment calculation article pdf available in brodogradnja 593. If you have a typical flanged coupler, 4 or 5 in dia, mate the shaft flange to the trans flange and adjust engine up or down until you have. Example of sighting through using optical or laser instrument fig. We provide 20 for you about propeller shaft alignment procedure in a boat page 1. Regarding john gross question about how a shaft can be aligned with so many things being so wobbly.
Results obtained clearly show the possibility of designing a singlepiece propeller hybrid shaft made of fibrereinfoced composite and. Professional measurement and alignment system for rotating machines. Propeller shaft alignment forward alignment approach. Pdf the ship propulsion shaft line is one of the most critical ship components having big influence on a ship. Lr load reduction, either manual or automatic, with corresponding alarm. The procedure was to blend the liquids epoxy and hardener for 3 min and.
Pdf modelling of propulsion shaft line and basic procedure. Inboard engine alignment frequently asked questions. A practical guide to shaft alignment plant services. Jaryszkami ska, sighting through as part of shaft alignment procedure 67 fig. And since the weight of the shaft sitting on rubber cutless bearings causes the rubber to compress, the shaft is not in alignment with the bearings anyway.
A method of aligning the shaft of a main engine with the centerline of the propeller shaft in which the main bearing pins of the crankshaft are made hollow to permit sighting through the crankshaft and the bearings for alignment of all of the elements. The proper shaft alignment procedure is to secure the driven equipment first because moving a pump, for. Veedrive ski boats require additional steps and instruction. These temperature the point of power transmission on changes are caused by. Prop shaft alignment yearly maintenance item moomba. The propeller shaft alignment needs to be checked once a year to check that everything is as it should be.
The machinist might even have the latest and greatest laser alignment system. The rest of the shafting are aligned and connected afloat. A misalignment of these three components as small as 0. It is a rare day when an important alignment project develops, all prealignment conditions are perfect and the machinist is given all the time in the world to do the alignment. Looking for propeller shaft alignment procedure in a boat. Shaft align1 and shaft align2 are intended to enhance propeller shaft bearing performance for oil lubricated systems. Mar 17, 2014 i have to align the propeller shafts on this boat. Running gear alignment professional boatbuilder magazine. May 25, 1971 a method of aligning the shaft of a main engine with the centerline of the propeller shaft in which the main bearing pins of the crankshaft are made hollow to permit sighting through the crankshaft and the bearings for alignment of all of the elements. Laser alignment is an essential component of a viable maintenance.
The proper shaft alignment procedure is to secure the. To provide an overview of alignment, the discus sion in this. 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. The force at the jack position is converted to the crowned top of the piston rod will centralize the contact with bearing position by means of a jack correction factor. Use this simple and effective procedure for shaft alignment of your rotating equipment. A guide to shaft alignment marine engineering courses. I assume youre talking about alignment of propeller shaft to gearboxengine. Wingd provides support for alignment if the ship building follows usual procedures and also if the. This measurement will give you the propeller shaft angle c. 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.
In isolation each strategy can help to reduce unexpected machine failure. The data validity rule 1 shown in following equation. Introduction the main propulsion shaft line is the essential part of a modern ship propulsion system, exposed to various conditions throughout the ships lifetime. Shaft alignment is a method or procedure by which shafts of machines such as motors and turbines are connected to a generator or pump in proper alignment.
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. Pdf design optimization of automotive propeller shafts. Oct 22, 2012 precision shaft alignment is no different. 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. Whether you are using dial indicators or a laser alignment tool if you are in the market for either, we have several options here, being able to. Design process the classic alignment technique would. 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. With feeler gauge find obvious gaps and fill them with shims, taking care of any rough soft foot condition.
Man diesel, recommended main engine alignment before chocking afloat condition, coupled to shafting system and main engine in sagged condition. Basic shaft alignmenl workbook combining the side and top views f yjew. When it comes to yacht maintenance, one of the least understood and most overlooked systems that require maintenance, engine and shaft alignment probably heads the list. 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. As a minimum, the shipyard is to produce a log recording all the shaft alignment installation steps, including the sighting data records, bearing slope verification, clearance measurement, and bearing reactions along with the manufacturers acceptance criteria. The best way to reduce the influence of friction is to alternatively to the use of a jack correction factor.
Features of sigma drive it is a constant velocity joint manufactured from alloy of bronze which enables it to withstand the heat generation and provides a long service life with less maintenance. All types of machines having shafts as an integral part of their structure, experience problems related to shaft alignment. 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. This alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. Jun 08, 2011 this centers the shaft in the shaft log and gets rid of the wiggle, assuming your cutless bearing was recently replaced. This paper presents an approach to determine the changing displacement of the propulsion shaft due to the vessels hull deflection. An essential component of any successful alignment procedure is the determination and. The shaft alignment class notations put additional focus on the impact of transient hydrodynamic propeller forces and moments, induced during extreme turning conditions in the upper speed range, on the aftmost.
One on the ccgs earl grey, and the other on the hmcs huron. Regarding the shaft alignment design and implementation efforts by the shipbuilding industry. Precision alignment is an essential part of a proactive reliability program. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is correct. Nov 19, 2015 as found shaft alignment results figure 1. 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.
Shaft aligning procedure preliminary checks visually check coupling, pipe hangers, base bolts, coupling spacing etc. Disasseinble propeller shaft joint using follow ing procedure. Removal 1 disconnect the ground cable from the battery. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is.
Tmea2skf laser shaft alignment alignment performed by. Basic shaft alignment workbook preface w elcome to the introductory book on. Improper alignment leads to increase of stresses in the shafts and thus on the equipment, which might. 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. With a loadonpad design, figure 1 the shaft is free to laterally within bearing clearance, and alignment data is difficult to obtain without temporary bearing shims to stabilize the sham with a loadbetweenpad design, figure 1 b, the shaft remains stable during the alignment procedure. Shaft alignment procedure completion of this work should take less than 1 hour. There are two bushins outside the hull as you can see in the picture, the shaft gland, a ball bearing and another thrust bearing before the aquadrive system. 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.
The content of this infographic is a basic guide to realign machines. This video is intended to guide a user through the shaft alignment process for a typical mid engine, direct drive tournament ski boat. To achieve this goal, components that are the most likely to fail must. 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 crafts. Center bubble in sight glass and record measurement.
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. Practice does make perfect in shaft alignment vibralign. This is a very easy project and doesnt take very long to complete. Engines, gearboxes and propeller shafts on ships are. A guide to shaft alignment achieving a satisfactory shaft alignment is paramount for the safe and reliable operation of a ship during its lifetime. It was not uncommon to overhaul at least one of the pump drive systems every month. Measure and correct alignment of the machine to achieve the final alignment to the required targets within tolerances. Engine must be aligned so that transmission and propeller shaft coupling centerlines are aligned and coupling faces are parallel within. You must first take the wobble out of it, then align the coupling flange on. The bent shaft affects alignment process by showing improper reading. 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. Pdf basic shaft alignment workbook for industrial rotatin. Ship shafting alignment procedure with offset of reference line. Propulsion shaft alignment method and analysis for surface.
Alignment of uncoupled propeller shaft before floating. Sighting through as part of shaft alignment procedure eliza jaryszkami ska west pomeranian university of technology, szczecin, institute of manufacturing engineering, al. Jul 07, 2015 helical gear box, helical gear reducer, helical reduction gearbox duration. I havent gotten around to anything with the prop shaft alignment though and am pretty intimidated.
There are several steps which need to be taken for a successful alignment job. Helical gear box, helical gear reducer, helical reduction gearbox duration. Alignment of the propeller shaft and the main machine or gearbox is carried out with. It is aliniometer during concentricity measurements on the shaft bracket on the conro vessel. Many consider runninggear alignment to be a black art. Any boat with an inboard engine needs to be aligned properly no matter what size engine you are using. This measurement can also be taken at the rear end of the shaft. It is a rare day when an important alignment project develops, all pre alignment conditions are perfect and the machinist is given all the time in the world to do the alignment.
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