With the measuring devices for shaft alignment accessories, you have the most complete measurement system to align the entire drive train on the market. Shaft alignment challenges the single sterntube bearing. In most ships, the main thrust bearing is located at the forward end of the main shaft within the main reduction gear casing. At the front i got 2 and at the rear i got 4 now from the instructions from tremec i am supposed to subtract these meassurements from the drive shaft slip yoke and the pinion yoke that both measured 3 so on the front 2 3 1 on the rear 3 4 1. In nauticus machinery shaft alignment these effects can be carefully considered when designing an optimal shaft line in order to avoid problems in operation. Spicer life series quick disconnect end yokes reduce the time to remove or install the driveshaft, equating up to a 75% labor savings for service. With twin engine vessels, we recommend the sureseal model with dual injection. The model considered is a 60 m long shafting system of a ship consisting of 10 bearings, one gearbox and one main engine. A practical guide to shaft alignment plant services. The line shaft extends up through the motor shaft and is properly secured at the top. E720 shaft alignment and geometric measurement easylaser. The propeller shaft alignment needs to be checked once a year to check that everything is as it should be.
The intuitive and affordable laser shaft alignment system skf shaft alignment tool tksa 31 the tksa 31 is skf s most affordable solution for easy laser shaft alignment. It is not intended as a comprehensive guide to alignment of process machinery, nor is it a substitute for seeking professional advice or reference to the manufacturers of the machinery. Carefully use sandpaper to remove a small amount of plastic from the entire front of the heavier propeller blade in the darkercolored areas. To provide an overview of alignment, the discus sion in this.
Shaft alignment challenges the single sterntube bearing design. It does not just give you all the functions for shaft alignment, it also gives the opportunity to check the machine base and levelness. Shaft alignment is typically thought of as nonadjustable. Documents for propeller shaft bearing systems surface fleet water quality package specs for quote rtf, 3. Jun 08, 2011 finally, remove the rods centering the shaft in the shaft long, slide the boot and packing gland back so the boot is back to where it was, and cinch down both hose clamps. Seawater lubricated propeller shaft bearings pdf, 2. This is a very easy project and doesnt take very long to complete. The acceptable offset shaft alignment tolerance for 1800 rpm is 4. The sureseal supports propeller shaft sizes ranging from 1 inch up to 8 inches and from 25 millimeters to 160 millimeters. Dev aratere, fracture of starboard propeller shaft, resulting in loss of starboard propeller, cook strait, 5 november 20 the transport accident investigation commission is an independent crown entity established to. Runout of propeller shaft 1 remove the center exhaust pipe. Propulsion shaft alignment method and analysis for surface. Running gear alignment professional boatbuilder magazine. Easylaser e720 is the allinone alignment solution for the maintenance technician and millwright.
The sureseal shaft seal is a dripfree, selfaligning propeller shaft seal that is oem equipment on many well known brands and types of vessels. This paper presents an approach to determine the changing displacement of the propulsion shaft due to the vessels hull deflection. Nauticus machinery shaft alignment download pdf dnv gl. Propeller shaft bearing systems thordon bearings inc.
If the propeller blade falls out of horizontal alignment. Okay so i measured the front drive shaft yoke and the rear drive shaft yoke. In some very large ships, however, the main shaft thrust bearing is located farther aft in a machinery space or a shaft alley. It is not intended as a comprehensive guide to alignment of process machinery, nor is it a substitute for seeking professional advice or.
Pdf dynamic balancing and shaft alignment researchgate. The objective of optimized shaft alignment is to increase the operating life span of rotating machinery. For this procedure, precalculation is used to find the gap and sag that should exist between couplings, when shaft alignment is correct. The alignment work and installation of the new bearings all went according to plan. 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. E950 bore alignment, laser alignment tool easylaser. As the shaft bearings are aligned, the engine is also brought into precise alignment with the shaft.
Our traditional standard propeller shaft bearing grade, thordon xl is a general purpose bearing offering superior performance compared to other bearings commonly used in propeller shaft applications. Alignment can be checked with conventional methods, employing light and targets, laser or measurements from a taut wire. Shaft alignment has in recent years become more of a challenge due to increased power, lower shaft speeds and heavier propellers in combination with a shorter propulsion shaft. When the shaft supports, strut, or keelshaftlogmounted cutless bearings are installed, their position should be carefully chosen to ensure that they are parallel and share the same theoretical shaft centerline. Propeller shaft alignment forward alignment approach this alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. The bent shaft affects alignment process by showing improper reading. The proper shaft alignment procedure is to secure the. We also measure and correct crankshaft web deflections.
Virtually everything we consume or use has been touched or produced in some manner by rotating gear. Chapter 11 drive lines, differentials, drive axles, and power. Sep 15, 2009 as the shaft bearings are aligned, the engine is also brought into precise alignment with the shaft. Xl provides good balance between long wear life, low coefficient of friction, reasonable abrasion resistance and cost effectiveness. By aligning the engine correctly, it should last much longer along with the transmission and prop shaft. 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. With hollow shaft motors, downward thrust of the pumps rotating assembly is carried by a thrust bearing built into the motor. A misalignment of these three components as small as 0. The ins and outs of engine and shaft alignment a laser can be used to. Sighting through as part of shaft alignment procedure eliza jaryszkami ska west pomeranian university of technology, szczecin, institute of manufacturing engineering, al. A drive shaft, driveshaft, driving shaft, tailshaft australian english, propeller shaft prop shaft, or cardan shaft after girolamo cardano is a mechanical component for transmitting torque and rotation, usually used to connect other components of a drive train that cannot be connected directly because of distance or the need to allow for relative movement between them. To obtain optimal parameters for service conditions engine crankshaft straight in service condition bearing load of all main engine bearings and propeller line in service condition to be within specified limits acceptable crankshaft deflections in. Jun 08, 2012 okay so i measured the front drive shaft yoke and the rear drive shaft yoke.
Office in accordance to the abs guide for enhanced shaft alignment. 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. Nov 08, 2017 propeller line in service condition to be within specified limits. Produce pdf reports directly from the display unit and. Engines, gearboxes and propeller shafts on ships are aligned. The work was completed within the docking schedule and. The intention of good alignment is to ensure that bearings are correctly loaded and that the shaft is not severely stressed. The data validity rule 1 shown in following equation.
The wobbling motion produced by a shaft that is not perfectly true and straight. Machine setup most often starts with the foundation. Efficient modelling by draganddrop or import from files. Shaft runout is often abbreviated tir total indicated runout, a measurement of how much a shaft wobbles with each revolution. 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. Regarding john gross question about how a shaft can be aligned with so many things being so wobbly.
If you put the transmission in neutral and slowly rotate the prop shaft by turning the coupler around, you should see essentially little or no wiggle in the packing gland and. Engines, gearboxes and propeller shafts on ships are aligned using the easylaser system. 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. Front shaft inner race 28mm outer 32mm wide commander cherokee 100. The ins and outs of engine and shaft alignment part i. Engine and propeller shaft alignment are among the most critical aspects of. Slightly tapping the yoke shoulder using a brass hammer, remove the bearing. Shaft alignment handbook, third edition, crc press, 2006. Regarding the shaft alignment design and implementation efforts by the. Shaft alignment is the configuration of the shafts and bearings relative to the centerlines of the bearings from the theoretical straight line condition, so as to achieve an acceptable bearing load distribution.
Mar 17, 2014 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. Achieving proper alignment, however, involves much more than merely adjustment the machines so that the shafts are coaxial. The goal of precision shaft alignment is to make the rotational centerlines of the machines collinear when in operation. Align the propellers blade horizontally along the balancer shaft. Clean, file and dress up any burr from the mounting faces and bolts holes. There were no problems with the alignment work or changing the bearings. 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 ins and outs of engine and shaft alignment part i from the. Chapter 11 drive lines, differentials, drive axles, and.
Used in combination with a jackup system, it allows the engineer. 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 drive shaft, also called a propeller shaft, is commonly a hollow steel tube with yokes welded on the end. Grc phase 3 focused on identifying any abnormal loading on the gear, shaft. Here the laser has been positioned in the aftmost shaft bearing, and aimed at the transmission output coupling. Sheng, ndition of the shaft alignment is crucial in order to make intelligent. Documents for propeller shaft bearing systems surface fleet. The performance data are based on vortex theory, using actual propeller geometry. Output as pdf file has been powered by universal post manager plugin from. Propeller shaft on site machining geometrical measurement osa carries out shaft alignment on all types of rotating equipment, including engines, gearboxes, generators, shaft support bearings, pump sets, winches and bow thrusters.
Propeller shaft 3c9 ssangyong y200 yad3c yad3c140 yad3c120 unit repair propeller shaft disassembly 1. Clean, dress up and file any burrs from mounting faces and. The technology enables fast and accurate measurement of the bending line, allowing the detection of any vertical or horizontal misalignment. Finally, remove the rods centering the shaft in the shaft long, slide the boot and packing gland back so the boot is back to where it was, and cinch down both hose clamps. This cuts the length of each shaft to avoid drive line vibration. Proper alignment of rotating equipment has a long been recognized as a prerequisite to safe, reliable operation. The tubular design makes the drive shaft strong and light. The ins and outs of shaft alignment part ii zf marine propulsion. Compulsory inclusion of propeller loads to be taken into account in the analysis. The nasa transonic airfoil analysis computer program is used to generate estimates for section lift and drag. Care has been taken by the authors, pruftechnik ltd, in the preparation of this publication. With the measuring devices for shaft alignment accessories, you have the most complete measurement system. This alignment technique uses a laser mounted in the region of the propeller and projects a laser reference beam forward. With the systems, you can also measure the straightness of shafts, foundations, etc.
Special brackets are available for alignment with locked rotors to increases the safety of the operator. The re assembling of the joint is no more difficult then disassembling. Even experienced yacht people think that if you get the two faces of the propeller shaft coupling exactly parallel, the engine is aligned, but youve got a huge amount of weight, seven or eight feet of shaft and a heavy coupling, hanging out. 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. When its centered, the shaft droop will have been eliminated. Shaft alignment handbook third edition by john piotrowski pdf. Thanks to flexible brackets you can install the equipment in the most appropriate place. Propeller shaft alignment forward alignment approach.
The performance data files available on our website are an excellent source for comparing apc propellers to one another. Fast and accurate laser alignment alignment control of the propeller shaft is done using wartsila. Design and optimization of automobile propeller shaft with. Nov 04, 2010 shaft alignment is typically thought of as nonadjustable. The ergonomic display unit with touch screen makes the instrument very easy to use and the builtin machine library helps storing alignment reports for multiple machines.
To align the coupling, move the propeller shaft, with attached coupling flange, toward. 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. With solid shaft motors, the line shaft is connected to a heavy ball bearing thrust assembly, located on the pump base plate. We specialise in all forms of rotating machinery repair and alignment problems. This paper presents a comprehensive alignment analysis process for a long shafting system. Nauticus machinery shaft alignment is an advanced and flexible software tool. Mark the assembly mark and remove the propeller shaft. 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 transmission and propeller shaft cou pling must.
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