woodruff key drawing

Tangent keys are shown in Figure 15.6. Advertise }, ANSI Shaft and Hub Keyseat Dimensions for Woodruff Keys per.

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The sunk keys are of the following types: Rectangular sunk key: It is the simplest type of key and has a rectangular cross-section. ANSI Key No.

ANSI B17.2. The basic idea of using … Last modified: Thursday, 20 March 2014, 8:21 AM, Design of Machine Elements by VB Bhandari, Analysis and Design of Machine Elements by VK Jadon, A Text Book of Machine Design by RS Khurmi, UG Courses - Agricultural Engineering (Version 2.0). A Woodruff key, Fig. Parallel sunk key: If no taper is provided on the rectangular or square sunk key, it is called parallel sunk key i.e. Feather keys are shown in Figure 15.3. About Splines. Tapered Keys: The tapered keys have a rectangular varying cross section. Where lighter loads are transmitted and the cost of cutting a keyway is not justified, round keys and flat or hollow saddle keys as shown in Fig. document.write(' ') Woodruff key: Woodruff key is a sunk key in the form of a semicircular disc of uniform thickness. Lower portion of the key fits into the circular keyway of the shaft. Slot for this type of is provided only in the hub as shown in Figure 15.5. A taper of about 1 in 100 is provided on its top side. Online Books & Manuals Engineering Videos GD&T Training Geometric Dimensioning Tolerancing | Feedback | Advertising ANSI Standard Woodruff Key Size Table Chart ANSI B17.2-1967 (R1998) Hardware ANSI … | Slot is drilled after the assembly so the shafts can be properly aligned. Single tangent key can transmit torque only in one direction. Max. Related: Shaft Key Seat for Shaft and Hub ANSI B17.1 ; Shaft Arbor and Keyseat Dimensional Data ANSI B94.19 ; Keyseat Design Tolerances for Electric Motors and Generators There are currently no comments available. Gib Head key is shown in Figure 15.2. It can be used with tapered shafts as it can tilt and align itself on the shaft. Splines are shown in Figure 15.8. Minimum keyseat width is that figure permitting the largest shaft distortion acceptable when assembling maximum key in minimum keyseat.Dimensions A, B, C, D are taken at side intersection. Woodruff key: Woodruff key is a sunk key in the form of a semicircular disc of uniform thickness. Resources, Development of patterns from sheet materials. It is used where the pulley, gear or other mating piece is required to slide along the shaft. Saddle keys are essentially for light duty only, overloading tending to make them rock and work loose on the shaft. Woodruff Key Dimensions. Chances of slip in case of the flat saddle key are relatively lesser and can transmit more power than the hollow saddle key. Min. 202 to 1012. A slot is machined in the shaft or in the hub or both to accommodate the key is called keyway. Square sunk key: Rectangular sunk key having equal width and thickness is called square sunk key. WOODRUFF KEY DIMENSIONS. of ME MER419: Mechanical System Design SHEAR STRESS ANALYSIS Square Rectangular Parallel Keys. In flat saddle key, the bottom surface touching the shaft is flat and it sits on the flat surface machined on the shaft. document.write(''); Length is calculated both for shear and crushing and then maximum value out of the two is considered. Rectangular sunk key is shown in Figure 15.1. As these two forces are not in same plane, they constitute a couple which tries to tilt the key. Round keys are shown in Figure 15.7. Disclaimer As the exact location of force P is not known, to simplify the analysis it is assumed that the force P acts tangential to the shaft. Hollow saddle key has a concave surface at the bottom to match the circular surface of the shaft. If T is the torque transmitted, where, d          = diameter of the shaft, Figure 15.9          Forces Acting on KeyFigure                                    15.10         Failure of Key a. Shear Failure b. Crushing Falure. A number of keys made as an integral part of the shaft are called splines.

Feather key: Feather key is a parallel key made as an integral part of the shaft with the help of machining or using set-screws. Tables are available which give standard cross-sections for square and rectangular keys corresponding to different shaft diameters. Privacy Policy Torque is transmitted by friction only and cannot therefore transmit high torque and is used only for light applications. Engineering Calculators

| Figure 15.1                Rectangular Sunk Key. Use a no. Torque is transmitted from the shaft to the hub through key. Therefore equal and opposite forces P’ also act on the key, which provide a resisting couple that keeps the key in position.

Key is a machine element which is used to connect the transmission shaft to rotating machine elements like pulley, gear, sprocket or flywheel. * These Width A values were set with the maximum keyseat (shaft) width as that figure which will receive a key with the greatest amount of looseness consistent with assuring the key's sticking in the keyseat (shaft). else These are used for high torque transmission e.g. Engineering News

17.13 Dimensions required for a Woodruff key in a tapered shaft. But the extra depth of keyway in the shaft increases stress concentration and reduces strength of the shaft. | Contact. Gib-head key: It is a rectangular sunk key with a head at one end known as gib head, which is provided to facilitate the removal of key. It can be used with tapered shafts as it can tilt and align itself on the shaft. it is uniform in width and thickness throughout. Keys are made of ductile materials. Commonly used materials for a key are hardened and tempered steel of grades C30, C35, C40, C50 and 55Mn75 etc.

; © Copyright 2000 - 2020, by Engineers Edge, LLC www.engineersedge.com All rights reserved OTHER TYPES OF KEYS Gib Head Keys Woodruff Keys. But in the absence of such data, following relations are generally used: For Rectangular Key:  w = d / 4 and  h = d / 6. { {

document.write(''); These are used for low torque transmission. 17.11, is a segment of a circular disc and fits into a circular recess in the shaft which is machined by a Woodruff keyway cutter. 17.12 Dimensions required for a Woodruff key in a parallel shaft, Fig.

For a known diameter of shaft, w and h can be calculated using these relations and then using the above strength equations required length of the key is calculated for given values of allowable stresses. // -->, Shaft Key Seat for Shaft and Hub ANSI B17.1, Shaft Arbor and Keyseat Dimensional Data ANSI B94.19, Keyseat Design Tolerances for Electric Motors and Generators, Arbor Keyway Cutter Hole Keyway Dimensional Data per ANSI/ASME B94.19, Shaft Arbor Keyway Dimensional Data ANSI/ASME B94.19, Design of Square Key and Keyway Woodruff Stress, Shear and Torque, GD&T Training Geometric Dimensioning Tolerancing. |

A Woodruff key has the advantage that it will turn itself in its circular recess to accommodate any taper in the mating hub on assembly; for this reason it cannot be used as a feather key, since it would jam. Woodruff key is shown in Figure 15.4. A sunk key is a key in which half of the thickness of key fits into the keyway in the shaft and half in the keyway of the hub. Home | |

Nominal Key Size W x D Min. The deep recess for a, Fig. Training Online Engineering Tangent keys    4. Saddle keys    3. Sunk keys    2. 17.14 can be used. Lower portion of the key fits into the circular keyway of the shaft. Shop Brass and stainless keys are used in corrosive environment. Figure 15.9 shows the forces acting on a rectangular key having width w and height h. Let l be the length of the key.