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. Published in commemoration of the firms 100th anniversary, the handbook. Examples are fans, blowers, shafts, couplings, large turbomachinery and others. Shaft alignment is the process of aligning two or more shafts with each other to within a tolerated margin. Better than a threaded connection, quicker than a welded connection and safer than a flanged connection. About esp esp offers a suite of products and services that are critical to global oems. John piotrowski shaft alignment handbook world of digitals. The coupling handbook, a new 176page illustrated reference work offered by lovejoy, inc. The single flexing coupling is for use in the case where shafts are supported by three. Flexible couplings grid couplings pin and bush couplings. Design data required type of prime mover, or driving machine electric motor starting arrangement.
Shaft deflection, runout, vibration, and axial motion. 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. A practical guide to shaft alignment plant services. Shaft couplings are available in different sizes and material finishes. The dodge coupling product line can offer a solution to almost any customer.
Coupling handbook torque rotation around a fixed axis scribd. As a guide, couplings with rubber or plastic elements can be considered as torsionally soft. Skf shaft couplings the following table shows typical character istics for various coupling types. Renolds quality is inherent across its range of power transmission products, allowing you to select for individual applications or combined engineered package solutions. When two shafts are properly connected by a rigid coupling, they operate as a single shaft.
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. The lovejoy coupling handbook introduction the goal of this handbook is to assist you with the process of sorting out the myriad of coupling styles that exist to select the one best suited to your application. A torque which spins the fastened shaft and coupling, and slides out. In this case, the shaft of the coupling is supported with a single bearing, arranged as closely as possible to the outer sprocket or pulley. Two editions later, this bestselling handbook is still the most trusted and widely embraced guide in the field. Couplings are mechanical elements that couples two drive elements which enables motion to be transferred from one element to another. Flexible shaft couplings maintenance guide, epri, palo alto, ca. Types of shaft couplings a thomas buying guide thomasnet. Faulkner columbus division, battelle memorial institute and department of mechanical engineering the ohio state university columbus, ohio 1. Flex hubs on floating shaft rffr assembly of the flex hubs on the floating shaft allows for easier replacement and allows the rigid hubs with greater bore capacity to be used on the connected equipment shafts.
To be used in determining which coupling type or style may be best suited for an application. A flexible coupling is used to connect two axially oriented shafts. The service factors listed are intended only as a general guide. The book is reference material on rotating machinery basics, pump overhaul, mechanical seals, basic vibration, and shaft alignment. Most metal cou plings are rigid, but some such as simplaflex have. Shaft collar, rigid coupling, flexible coupling cad files. Basic shaft alignment workbook for industrial rotatin n1achincrv. Rotating machinery is the heart of many industrial operations. The preceding table is a general comparison of the skf range of couplings. Shaft alignment handbook third edition by john piotrowski pdf. Shaft alignment handbook crc press book 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. 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 and additional loads which, depending on their severity, can produce premature wear, or even catastrophic failure of bearings, seals, the coupling itself, and other machine components.
Shaft couplings general fundamental principles 6 rigid couplings 6 torsionally flexible couplings 68. Construction, installation and maintenance of flexible couplings. Text and photographs by steve dantonio abovein this split shaft coupling. Moreover the uni coupling can be installed fast and thanks to the wide range, it can eff ortlessly connect diff. Designing your power transmission system, and keeping it running smoothly and profitably, is a complex challenge. To help you improve rotating equipment performance, we have an extensive range of products and support services.
Vibration isolation mounts are suitable for the elastic mounting of machine units such as motors, compressors and pumps as well as use on machine doors, elevators, and other applications where a cushioned axial stop is desired. Rigid couplings connect shafts using bolted flanges, keyed sleeves or ribbed clamps bolted together over the shaft ends with keyways. The motor bearing at the coupling end then takes over radial guidance of the pump shaft. Shaft deflection, runout, vibration, and axial motion chapter d4 page 4 contact kalsi engineering search this handbook bearing internal and mounting clearances influence shaft runout side loads cause the shaft to articulate within mounting clearances, resulting in lateral shaft deflection at. Dodge dflex couplings type sc coupling dynamically balanced to agma class 9 standards, the type sc spacer coupling accommodates a wide range of ansi and iso between shaft end distances. The result is increased stress on bearing races and rollers.
Flange couplings cone clamping couplings gear couplings disc couplings. A flexible coupling connects two shafts, endtoend in the same line. A reference for the usage of these couplings is shown in the left illustraion. Links to pdf outline drawings, dxf drawings and 3d cad data sites. For example, a machine running at 1800 rpm with 12 inch of spacer shaft length would allow a maximum offset of. A coupling should be never shaft couplings the marriage of engine to propeller shaft is the most essential link in the drivetrain.
A rigid coupling does not permit relative motion between the shafts of the driver and driven machines. Chapter 1 wind turbine components iowa state university. Pdf a practical guide to shaft alignment ahmad rohman. Esp has developed inhouse engineering that helps design oem components such as seals, metal castings and forgings, and also provides valueadded assembly, inventory management programs. Tech handbook installing and maintaining your roach conveyor do not operate before reading this handbook important safety information enclosed keep in safe placedo not discard line shaft conveyors model 738ls and 796ls. Type s couplings are offered with epdm, neoprene, or hytrel sleeves. Virtually everything we consume or use has been touched or produced in some manner by rotating gear. Shaft couplings and universal joints universal joints singleuniversaljointstypesgandh, shafts6to50mm. Two decades ago, john piotrowski conferred upon the field an unprecedented tool. When the centerlines of their rotating shafts dont match up perfectly, it can lead to wasted power, accelerated component wear, and even the equipment failures the following are the most prevalent causes.
Twin shaft coupling a semifloating shaft coupling is combined with a. Select the shaft slip torque when it is less than the allowable torque according to the selection method given on p. The shaft coupling comprises of single or different helical cuts in the coupling body which commonly can oblige parallel misalignments up to 0. These are used chiefly where no journal or thrust bearing is provided for the pump or the motor shafts, as is often the case with vertical pumps fig. Download shaft alignment handbook third edition by john piotrowski easily in pdf format for free. This article describes what is a coupling, types of couplings, rigid couplings, flexible couplings, universal couplings, hookes coupling, pin bush coupling, flanged coupling etc. A rigid coupling is primarily used for vertical applications, e. With the uni coupling you connect pipes the easy way. For spacer shafts the table gives the maximum allowable offset for 1. A shaft coupling is a mechanical device used to connect rotating shafts and absorb misalignments between them. It features a dropout center assembly for easy equipment maintenance. The lovejoy coupling handbook lovejoy a timken company. A rigid coupling does not permit relative motion between the shafts of the driver and driven. They are utilized essentially for movement control applications where torques are regularly underneath 100 inchlbs.