I sized the key and keyseat and everything looks good from a stress point of view, however, i am more curious about the positioning of the key. Shaft is supported in selfaligning ball bearings and gears are both 10 pitch, 40 tooth, 20 spur gears. The key and keyway design is fully controlled by the standards based on only one parameter the shaft diameter. In the first edge features dropdown menu, select keyway groove with one rounded end dimensions enables keyway groove with one rounded end dimension. Keys failure of keys is by either direct shear or bearing stress key length is designed to provide desired factor of safety factor of safety should not be excessive, so the inexpensive key is the weak link key length is limited to hub length of attached gear, sprocket, etc. We make some of the worlds most unique wood iphone cases around. In some cases you maybe do not want to use shaft generator. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat, which is a slot and pocket in which the key fits. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. In general, the majority of axial capacity methods used by shaft are based on the latest fhwa manual. Design analysis of shafts using simulation softwares. Solidworks quick tip using library features to create keyways. Design based on rigidity is to ensure that maximum deflection because of bending and maximum twist due to torsion of the shaft is within the allowable limits. Find all the bearings, bearing housings, vbelts, oil seals, collars you need and more including the 1 x 36 keyed shaft at.
Keyway groove with one rounded end dialog box inventor 2019. Video lecture on keys and its function from design of shafts, keys and couplings chapter of design of machine for mechanical engineering students. Type of the keyway groove is set automatically according to the key type. This pa note will explain the uses of keys and keyways in pulleys and bushings, and present current industry standards for key and keyway component sizing. We have considered various other shapes for design apart from the cylindrical general shape of the shaft such as. The rounded ends make it easy to slide gears, hubs, and other components into place. Feb 26, 2015 with more than 30 years experience and thousands of customers in hightech, medical, machine design, energy and other industries, goengineer provides bestinclass design solutions from solidworks. The key prevents relative rotation between the two parts and may enable torque transmission.
On the design tab, select cylinder in the tree control. Compare combined stresses to suitable allowable stresses. Metric standard parallel keyway and key sizes shaft diameter mm keyway mm key mm from to width w depth h width w depth t 6 8 2 1. The proportions of crosssections of keys vary with the shaft size, and. Transmitting torque with keyed shafts linear motion tips. Three main problems in current software were identified.
A shear key is a feature intended to fail and avoid further damage should the machinery be accidentally operated in excess of its design limits. In addition, several other axial capacity methods are provided for clay. It is cut by a vertical or horizontal milling cutter. I have a tapered shaft with a keyway parallel with the taper. The depth is dimensioned at the side of the keyway. Of course, that is one reason many of us appreciate older machinery. Shaft keys types and their design bright hub engineering. Shaft bore keyway keyway diameter nominal shaft bore keyway keyway diameter diameter width x depth radius over to including diameter minus tolerance width x depth radius 12. A keyway is a slot or recess in a shaft and hub of the pulley to accommodate a key. Shaft keyways for woodruff keys are milled with woodruff keyslot milling cutters figure 435. Design stresses in shafts august 15, 2007 23 find the torsion in the shaft. Optimization of the keyway design with consideration of effect of stress.
The diagram shows the importance of having a big and smooth radius at the bottom of the keyway, this is. The keyway is a slot machined either on the shaft or in the hub to accommodate the key. In this case, the torque that can be transmitted when a key is added to the shaft is approximately 12 percent lower than the torque that can transmitted by the plain shaft 393 nm. Browse keyway s selection of premium handcrafted leather, metallic, and wood iphone 78 plus cases. Keep in mind that adding a keyway to an existing shaft weakens the shaft. Now, i cant remember exactly what the curve is called but the intersection of a cone and a plane parallel and offset from the cones axis is not going to be a straight. Keyways are still the most common of all joints between shaft and hub. The rationale of shaftdesigner was that further development was needed in the field of alignment software. Design tapered keys designed to be inserted from the end of the shaft after the hub is in position. The diameter of shaft for flywheel is obtained from the maximum torque transmitted.
Machine design applications gear design data and engineering. Shaft keys are important machine components designed to transmit torque and rotative force. Export single member analysis reports in an easy and professional format to pass on to your client or fellow engineer. Video provides an overview of boundary conditions, mesh inspection, and results evaluation for the shaft with keyway example. The keyway is roughed out using a chisel and then filed to size. Combine with a machine key to transmit torque to gears, sprockets, and other power transmission components. Design of square key and keyway wood ruff stress, shear and torque equations and calculator.
Pdf optimization of the keyway design with consideration of. Keys and keyways 51 introduction university of babylon. Keyway design mechanical engineering general discussion. Use the keyway dialog box to enter parameters for keyway feature in the shaft component generator. Standard inch series bores and keywaysdata sheet ds103 rev. Shaft shown drives a gear set that is transmitting 5 hp at 1750 rpm. Engineers tend to design using an ample safety factor, and older equipment in particular was overdesigned even by todays standards. This technique is long, tedious, and rarely used anymore. These shafts have keyways only on the ends, leaving a plain shaft in the center. For this use in calculation and design, it was thought best to coin a term to permit comparison between a shaft with keyway. In the first edge features dropdown menu, select plain keyway groove. Circular shafts with rect angular and circular keyways, external splines, and milled flats along with rectangular and xshaped torsion bars are presented. Name of the dimension is used in the calculation tab and in the results pane. The main reason of failure of shaft and keyways in shafthub connection is the.
Goenginneer delivers software, technology and expertise that. The key and key seat cross section are iso standardized. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. A little consideration will show that the keyway cut into the shaft reduces the loadcarrying capacity of the shaft. There are several types of shaft keys, each with their own particular role and application. Mechanics and machine design, equations and calculators. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users.
Stress concentrations in keyways and optimization of keyway design. In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. Friction will help transmit torque and provide resistance to axial motion of the hub relative to the shaft. The pictures shows the stress pattern in a shaft with a keyway under pure torque. Shaft and hub keyway and key sizes keys connecting shafts to pulley hubs are commonly used to achieve reliable noslip power transmission in belt drive systems.
Key can be deformed over time and result is a loose drive. Surface pressure on the shaft, parallel key and hub. Shafts are designed on the basis of strength or rigidity or both. Machining of square shafts with rounded ends with or without keyways other machining available upon request per prints provided drill, tap, threading for keyway mm dimensions see the table at the bottom of this page. Design based on strength is to ensure that stress at any location of the shaft does not exceed the material yield stress.
Allowable shear stress for the material of the shaft. Standard inch series bores and keyways data sheet ds103 rev. Plain keyway groove dialog box inventor products 2016. Series f couplings supplied with 4 all dimensions per agma 9002a86. A list of standard keyway and corresponding key sizes for english shafts are listed below in table 1. These formulas are used to solve either a shaft with one or more sections or a beam with one constant section with multiple supports and loads. The introduction of a din or ansi standard keyway into a shaft normally reduces the shaft radius by 20 to 25%, and often as much as 50%. That dimension changes with the diameter of the shaft and width of the key. Referencing figure 1, the keyway dimension is w x t.
A further disadvantage to shaft keys in a world of increasingly compact motion components is the reduction in the torque density of the shaft and its respective locking element. When installed, these keys fill oval keyways completely, reducing stress on the key and shaft. Carry keyway on your next adventure wood iphone 78 plus cases proudly handmade in toronto. Allowing you to solve more complex shafts with more loads, bearings and stress concentrations. Leather and wood iphone case keyway handcrafted iphone 7.
Straight keys, with a square or rectangular cross section, are the most common type of key. Have you considered using the keyway generator in design accelerator. Design of intermediate shaft d the intermediate shaft is subjected to bending moment along with twisting moment. The prole keyway is cut by an endmile while the sledrunner keyway is cut by an ordinary milling cutter. The first is the lack of a single shaft model to perform all types of shaft related calculations. Design of square key and keyway wood ruff stress, shear. As a constantly evolving tech company, were committed to. N l pedersen 1 work on effect of stress concentration and optimization of keyway design using numerical finite. The xyz keyway cutter is capable of cutting keyways in shafts from 424 101. The calculation is designed for geometrical designs and complex examinations of shafts. Dimensions enables plain keyway groove dimensions editing.
A key with a square end is likely to damage the shaft when transmitting torque, figure 5. There are three ways to calculate and design a keyway. Reliable method based on a machined keyway in shaft and associated bore. If the impact of the material density is included in. Throughout our lives, the things we choose to spend our time creating are a way of communicating our passions, interests, and personalities to others. This compact modular design allows quick setup and ease of handling in confined work areas. In this study we have used proe, a design software, to design a shaft and ansys, a simulation software, to simulate the actual working conditions of a shaft and pulley attached to it at its centre. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. Leather and wood iphone case keyway handcrafted iphone. Keyway dialog box inventor 2020 autodesk knowledge network. Standard inch series bores and keyways data sheet ds103. A number of keys made as an integral part of the shaft are called splines. The taper will impart a compressive contact pressure between the hub and the shaft. The key and keyway design is fully controlled by the standards based on only one parameter.
The hub keyway is dimensioned by its width and depth on the shaft keyway sides. Optimization of the keyway design with consideration of effect of stress concentration on different materials. Use the keyways with machine keys to transmit torque to gears, sprockets, and other keyed components. Shaft is a computer program used to evaluate the axial capacity and the shortterm, loadsettlement curves of drilled shafts or bored piles in various types of soils. In the section features dropdown menu, select add keyway groove.
Dimensions of shaft keys, standardized many years ago, are commonly considered to be the main concern in applying these devices. Learn the process of using solidworks feature library to drop keyway cuts on shafts and also internal bores. Solidworks quick tip using library features to create. Objectives after studying this unit, you should be able to identify keys and their application, calculate forces on keys, and design keys.
Unless otherwise specified, the shaft keyway is assumed to be standard. Description displays the description of the parameter. When you choose to purchase a product from keyway, what you will receive is much more than just a product in a box. Shaft keys, shaft key design, rectangular keys, square keys, woodruff keys, gib keys, taper keys.
Use the middle of the shaft with bearings and other. The maximum shear stresses in the shaft occur in the keyway end if the key is not. Design of square key and keyway wood ruff stress, shear and. I was taught that the keyway depth was 12 the key height in the shaft and 12 the height in the gear hub or mating part. The stress concentrations at the keyway end are most severe for the prole keyway so with respect to fatigue the sledrunner is the best design. It is concluded that rectangular keyway is best from the design point of view of solid. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices.
Keyway cutter technical data uk english pdf document, 478. Handmade by artisans in canada, the usa, and around the world. Alternatives to keyways in motion systems tech briefs. Optimization of the keyway design with consideration of. The woodruff keyslot milling cutters are numbered by the same system employed for identifying woodruff keys, thus, a number 204 woodruff keyslot cutter has the proper diameter and width for milling a keyway to fit a number 204 woodruff key. The corner of the key creates a high contact stress in the. For a safe calculation, the eassistant software uses the most conservative. British standard metric keyways for square and rectangular parallel keys 11 516 38 716 12 34 34 78 nominal diameter, d 6 12 7 12 9 square keys preferred for shaft diameters above this line. However, designers tend to forget that other important factors exist. We offer local and national dialup access, high speed services, tollfree 24hour technical support, email, web hosting, and other member benefits. Skyciv offers a wide range of cloud structural analysis and design software for engineers. D shaft diameter w width l length k s service factor k a application factor k d keyway application factor k f fatigue life factor k w wear life factor f s design factor of safety n number of keys same size. The exact location of the keyways needs to be decided. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings.
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