Because of the offset input shaft on the diff about 1 34 i was uncomfortable about the angle this would cause the prop shaft to sit at, so i decided to move the back engine mount across to point the gearbox directly at the diff input flange. The fixturlaser xa system is a powerful, easy to use laser guided prop shaft alignment system for checking and correcting alignment in propeller or any driven rotating shaft. 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. 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. A simple implementation of property objects props as an easier alternative to standard javabeans. Drive shaft system 12 remove the front arm ball joint from the housing. Discussion in inboards started by holdfast, mar 17, 2014. St1 926470000 axle shaft puller st2 28099pa110 axle shaft puller plate 15 after scribing an alignment mark on camber ad. One on the ccgs earl grey, and the other on the hmcs huron.
I just bought our boat last fall and am new to the v drive. Its the same on every boat, just harder to get to with a vdrive. The model considered is a 60 m long shafting system of a ship consisting of 10 bearings, one gearbox and one main engine. Precision machined inboard shafts, shaft couplings, shaft hardware, flexible couplings, shaft seals. Alignment of stern tube bearings alignment check on main bearing pockets or cam shaft on aux. 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. Specifics of shafting alignmentfor ships in service. Many consider runninggear alignment to be a black art. Shaft alignment handbook third edition by john piotrowski pdf, lots of the substance amenities taken for granted in the modern society are made possible by the many rotating machinery systems found in each area of the planet. 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.
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. Basic shaft alignment workbook for industrial rotatin n1achincrv. These types of change can alter crankshaft deflection or shaft alignment readings which are taken even a few hours apart. Shaft alignment handbook by john piotrowski, piotrowski. From aligning propeller shafts to engine mounts and reduction gearboxes, the precision, versatility and compact size of pinpoint laser systems are ideal for servicing a. Shaftdesigner the shaft calculation software by imt. Produce pdf reports directly from the display unit and save to usb. Pump alignment report format free download as word doc. Shipbuilding laser alignment by pinpoint laser systems. Pdf basic shaft alignment workbook for industrial rotatin. You must first take the wobble out of it, then align the coupling flange on. 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. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is correct.
Pdf specifics of shafting alignmentfor ships in service. Youll start with the strut and the shaft alignment, then do the shaft and transmission. To achieve this goal, components that are the most likely to fail must be made to operate within their acceptable design limits. Shaft line alignment and lateral vibration analysis are especially sensitive to proper boundary conditions determination. 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. There is a long, very good tutorial on youtube and ccf about the whole process. Start a free trial now to save yourself time and money. Propeller shaft definition and meaning collins english. From aligning propeller shafts to engine mounts and reduction gearboxes, the precision, versatility and compact size of pinpoint laser systems are ideal for servicing a wide array of specialty onboard applications. Check the prerequisites for a correct alignment before aligning, e. A simple and effective procedure for doing shaft alignment of rotating machinery. This is very important as if you assemble the shaft out of alignment you might find you now have a balancing issue.
Mobileereaders download the bookshelf mobile app at or from the itunes or android store to access your ebooks from your mobile device or ereader. Prop shaft alignment yearly maintenance item moomba. A practical guide to shaft alignment plant services. The above are just a small selection of alignment issues, if you have a question if your alignment problem can be measured with our application, just call or mail. To start viewing messages, select the forum that you want to visit from the selection below. Nowadays, it is still difficult to find out realistic data for all the shaft line foundation characteristics. Virtually everything we consume or use has been touched or produced in some manner by rotating gear.
Pdf design optimization of automotive propeller shafts. Us army ordnance center and school the free information society. Apr 21, 2017 there is another side to the alignment story. A misalignment of these three components as small as 0. Shaft line alignment analysis taking ship construction. Jun 08, 2011 this centers the shaft in the shaft log and gets rid of the wiggle, assuming your cutless bearing was recently replaced. The data validity rule 1 shown in following equation. 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. 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. Home up aqualoy 17 propeller shaft aqualoy 19 propeller shaft aqualoy 22 and 22 hs propeller shaft 316 stainless steel propeller shaft 174 stainless steel propeller shaft nitronic 50 stainless steel propeller shaft propeller shaft tolerance tables how to size a propeller shaft propeller shaft bearing. Due to the design and construction of the drive shaft and universal joint assembly, the replace ment of any part or parts can be accomplished without special tools or garage equipment.
I have a very short prop shaft in my car about 14 overall. When the shaft of two rotator machines are directly coupled via a flexible coupling, any misalignment between their centerlines of rotation can result in vibration. Shaft lines with pointwise, ideal stiff models of journal bearings are common. To fit the flange, highpressure oil of more than 2000 bar is injected between the muff and the coupling flange by means of the injectors in order to expand the muff. Shaft alignment is the process of aligning two or more shafts with each other to within a tolerated margin. Visit ludeca learning center where you can download procedures for precision alignment, bearing installation.
Design optimization of automotive propeller shafts. Heavy weather produces cyclic change of hull shape so that the hull of a moderately sized ship can flex by as much as 150 mm. Fill out, securely sign, print or email your pump alignment form instantly with signnow. Mar 17, 2014 i have to align the propeller shafts on this boat. Problems with alignment verification are often related to our ability to have control over the following. Prop shaft alignment yearly maintenance item if this is your first visit, be sure to check out the faq by clicking the link above. 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. Youll have to pull the shaft out completely to replace them. For instance, if the inner diameter of the shaft log is 1. Its very difficult to even reach the prop shaft coupler under and around the tranny and v drive. Nov 19, 2015 as found shaft alignment results figure 1. Propulsion shaft alignment method and analysis for surface. Regarding john gross question about how a shaft can be aligned with so many things being so wobbly.
Us army ordnance center and school five credit hours general the wheeled vehicle drive lines, axles, and suspension systems subcourse, part of the light wheel vehicle mechanic mos 63b skill level 3 course, is designed to teach the knowledge necessary to develop the skills for servicing and maintaining drive lines, axles, and suspension systems. Prop shaft alignment yearly maintenance item page 3. The most secure digital platform to get legally binding, electronically signed documents in just a few seconds. Download shaft alignment handbook third edition by john. A guide to shaft alignment achieving a satisfactory shaft alignment is paramount for the safe and reliable operation of a ship during its lifetime. This alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. 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.
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. It is an absolute requirement for machinery before the. Are you guys checking the alignment that frequently. Pump alignment form fill out and sign printable pdf. Dual psd, dual laser beams and dual inclinometers for superior control and accuracy. Shaft weights, buckling torque and dynamic performance for different design alternatives, have been studied. Basic shaft alignment workbook preface w elcome to the introductory book on shaft alignment of rotating machinery. 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. 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. Running gear alignment professional boatbuilder magazine. Here you can download the pdf template of the tksa 20 shaft alignment report, which can be used for documenting of your alignment activities. Site contains information about the software for propulsion shafting alignment suitable for all known shaft alignment techniques, including strain gauge 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. Download our english dictionary apps available for both ios and android. The bent shaft affects alignment process by showing improper reading. 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. The book is reference material on rotating machinery basics, pump overhaul, mechanical seals, basic vibration, and shaft alignment. Easylaser is a cost effective investment that will pay. Propeller shaft alignment forward alignment approach. 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. Torsional fatigue teststand drive shaft the mts teststand approach the mts teststand approach enables oems, suppliers and contract test labs to adapt to evolving vehicle subsystem and component testing requirements with speed, efficiency and confidence. 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. The pdf report is ready to be imported into any work flow management. This paper presents an approach to determine the changing displacement of the propulsion shaft due to the vessels hull deflection. If this is your first visit, be sure to check out the faq by clicking the link above.
I replaced mine last summer when i replaced my bent shaft and prop. 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. Fortunately, resolving these alignment issues has gone hightech, too. Pinpoint laser alignment systems are used extensively in the shipbuilding and ship repair industry. This invention relates to a method of shaft alignment of a main engine shaft in shipbuilding. And best of all its ad free, so sign up now and start using at home or in the classroom. Mechanical engineering a series of textbooks and reference books founding editor l. The manual says to check the prop shaft alignment each year with the boat in the water. Faulkner columbus division, battelle memorial institute and department of mechanical engineering the ohio state university columbus, ohio 1. Propellers are not used for terrestrial propulsion road or rail because solid friction with wheels is far more efficient than any fluidbased means either with propellers or with jet engines. 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. Step i mark your shaft so that you can align the shaft at reassemble. Keep track of machinery status with vibration level check. In this design manual fenner present a range of shaft couplings which enables an optimum solution to be found for virtually all industrial applications.
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