The taper varies from 1 in 48 to 1 in 24 and it may be increased up to 1 in 8, if a locking device is provided. Pipe and pipe fittings, materials and applications, pipe joints, screwed joints, welded connections, cementing, flange joints, spigot. Cotterjoints and pin joints are used for rods in tensile or compressive load. Cotters keys splines welded joints threaded fasteners joints formed by interference fits 2. Sharp point is internal to part, thus circle cotters are often used where sharp points are not desirable. Machine drawing1 pages 101 150 text version fliphtml5. Woodruff key it is a segmental disc with a flat or round bottom. Mar 01, 2016 video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links chapter of des. It is named so because of its freedom to move or rotate around the pin which joins two.
This book deals with the fundamentals of engineering drawing, to begin with, and the authors introduce machine drawing systematically thereafter. Cotter pins include the wellknown hair pin cotters, as well as our unique inventions. Mohair bear making supplies limited cotter t pin joints. Cotter joint a detachable joint that is fastened or adjusted by a wedge. The cotter pin is inserted so that its flat faces the axles flat. Shafts, splined shafts, keys, keyways, types of keys, light and heavy duty keys, comparision between keys and cotters, cotter joints and knuckle joints. Function a cotter joint is used to connect one end of a rod is provided with a. Keys are used where parts are subjected to torque but cotters are used where parts are subjected to tensile or compressive forces. The text of the new edition has been thoroughly revised to include new concepts and practices in the subject. Apr 29, 2020 chapter 7 cotter and knuckle joints machine design, mechanical engineering mechanical engineering notes edurev is made by best teachers of mechanical engineering. Nov 07, 2009 cotter joint a cotter joint is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. Both christie bears and our landlord are working to ensure the safety of both our customers and ourselves. Kannaiah has a rich experience of teaching this subject for about twenty five years, and this has been well utilised to rightly reflect the treatment of the subject and the presentation of it.
A pack of 100 joints will be enough for twenty bears. Keys, cotters and pin joints 111 indian institute of. The low chamfer angle of the wedge assures tightness of the joint and provides selfbraking, which prevents the wedge from falling out. The woodruff key, cone k ey and pin key are the special purpose keys used for specific applications. Knuckle joint is yet another to join rods to carry axial force. A set of 10mm cotter pin joints enable your creation have moving arms, legs and head. The material used for the joint may be steel or wrought. Inserting cotter pin joints into a teddy bear youtube. Interlocking joints in wood cotter online laser cutting. Video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links chapter of des. Each joint from sizes 6mm 10mm consist of two fibreboard discs and one pin. Mainly used as the head joint, but can be used on all five joints for a totally floppy effect. A cotter joint is a simple and compact connection and is easily assembled and disassembled. Microsoft word cottersleeve joint and unversal coupling.
So, i suggest you go for this valuable piece without any hesitation. Keys are driven parallel to the axis but cotters perpendicular to axis. A number of rings are available to suit different applications in both steelzinc plated and stainless steel. Standard, straight cotter pins, also called split cotter pins, have two straight prongs that are spread apart to keep other fasteners, such as bolts and nuts, in place. Bowtie locking cotters, ruering locking cotters and infinity shooks. Bottom part of pin is covered by collar and locked by. There are different ways to do it and the best solution depends on how soft the material is and how much it varies in thickness. Cotter joint piston tension physics free 30day trial. Spigot and socket jointcotter joint rods, having axial tensile or compressive forces are connected by cotter joints. Keys cotters and joints shafts splined shafts keys keyways. Online catalogue teddy bear joints cotter pin joints. The cotter joint does not permit any axial misalignment as it is the rigid joint.
Cotter joint article about cotter joint by the free. Sunk keys a key that engages a slot formed in both pulley and shaft is known as sunk keys. Bending the straight prong after insertion provides additional locking protection. Cotter joints knuckle joints keys and pin joints starting with the simple pin and key joints all the main fasteners will be discussed here. Keys, cotter and unit 5 key, cotter and knuckle knuckle joints joints structure 5. Installing a cotter pin prevents parts from backing out of or slipping off other parts. Keys cotter joints mechanical engineering manufactured. Chapter 7 cotter and knuckle joints machine design. Design procedure of cotter joint, socket and spigot joint.
A key is generally driven parallel to the shaft whereas a cotter is driven perpendicular to the shaft. Venkata reddy as a workshop superintendent have wisely joined to give illustrations usefully from their wide experience and. The cotter is usually made of mild steel or wrought iron. Keys resist shear over a longitudinal section but cotter resist shear over two transverse sections.
Cotter joints can be quickly assembled as well as disassembled. Failure of knuckle pin in bending if the pin is loose in the fork. Sleeve cotter joint pdf the working of the cotter and sleeve and cotter and gib are shown below. Cotter joints are used to connect together two rods rigidly to transmit power in the lengthwise. Keys cotter joints mechanical engineering manufactured goods. Teddy bear joints, teddy bear supplies, christie bears ltd.
May 02, 2018 installing a cotter pin prevents parts from backing out of or slipping off other parts. Aim design and drawing of cotter joint function a cotter joint is. You can buy five 10mm cotter pin joints that contains 5 cotter pins and 10 fibre board disks enough for 5 joints, eg two arms, two legs and one head. Unlike in cotter joints, the pin in a pin joint is not drivenin with a force fit, but isinserted in the holes with a clearance fit.
The cotterjoint does not permit any axial misalignment as it is the. Christie bears limited office 5, pyle enterprise centre, village farm industrial estate, village farm road, pyle, bridgend, cf33 6bl. Keys, cotters and pin joints 1of flexibility or one rod may be positioned at an angle in the plane containing the rods withrespect to the other rod, after providing suitable guides. Narayana, as a professor in mechanical engineering and mr. The main difference between keys and cotters are as follows. It is named so because of its freedom to move or rotate around the pin which joins two rods, a motion which naturally exists at finger joints or knee. Venketa reddy written by three distinguished authors with ample academic and teaching experience, this text book deals with the fundamentals of engineering drawing to begin with, followed by introduction of machine drawing systematically and incorporating the latest draughting standards. Can yu please send me machine design pdf on my email.
A cotter is a flat wedge shaped piece of rectangular crosssection and its width is tapered either on one side or both sides from one end to another for an easy adjustment. Cotter key definition of cotter key by the free dictionary. In the absence of such a tool, the cotter pin is installed by tapping it with a hammer. The locking device may be a taper pin or a set screw used on the lower end of the cotter. Pivot point is a leader in nonthreaded fastener innovation, producing both standard and custom fastening solutions for all industries. Keys are also employed to secure gears, pulleys, discs, flange and other similar parts to shafts or axles. What is the defference between key and cotter answers. Cotter joints and pin joints are used for rods in tensile or compressive load.
Installing the pin wedges the shaft against the sides of the hole and prevents it from turning. Knuckle joint, cotter joint and turn buckle the article. In this small guide, we will show how you can make wooden joints that are both stable and gluefree. The locking device may be a taper pin or a set screw used on the low er end of the cotter. Cotter pin joints these are the traditional form of teddy bear joint. The keys are subjected to shear and crushing or bearing stress while transmitting. The cotterjoint does not permit any axial misalignment as it is the rigidjoint. Introduction principles of drawing orthographic projections sectional views screwed fasteners keys, cotters and pin joints shaft couplings pipe joints pulleys riveted joints welded joints bearings chains and gears jigs and fixtures limits, tolerances, and fits surface roughness blueprint reading assembly drawings part drawings. Excepting the 4mm 12mm joints that exclude the washers, each joint consists of two discs, one t headed cotterpin and two metal washers. Sleeve cotter joint pdf the working of the cotterandsleeve and cotterand gib are shown below. Examples include fabric and rubbersealed environments. The text of the new edition has been thoroughly revised to include new concepts and practices in. Types of keys, cotter and knuckle joints all questions are compulsory keys, cotters and pin joints discussed in this sheet are some examples of removable temporary fasteners. Notes for an introductory course on electrical machines and drives by.
Following are the three commonly used cotter joints to connect two rods by a cotter. Cotter joints may be used in areas subject to corrosion during operation, resulting in difficulty in turning rusty bolts and nuts of threaded connections. This document is highly rated by mechanical engineering students and has been viewed 1586 times. Cotter and knuckle joints understanding engineers gallery.
Engineering machine drawing by k l narayana has something better to offer than other books like detailed drawing, bis standard and it is equally important for students and teachers. Rods may be of different cross sections like circular or square. A key is subjected to torsion whereas a cotter is subjected to tensile and compressive forces. Design of friction drives couplings clutches introduction friction clutches torque transmitting capacity uniform pressure theory uniform wear theory multidisk clutches cone clutches centrifugal clutches. Venkata reddy ebook consists the features of assembly drawings, part drawings and computeraided drawings to cater to the needs of students pursuing various courses.
Venketa reddy written by three distinguished authors with ample academic and teaching experience, this text book deals with the fundamentals of engineering drawing to begin. The pin joint permits angular misalignment as it is flexible. Cotter pin joints, teddy bear supplies, christie bears ltd. A cotter joint is a temporary fastening and is used to connect rigidly two coaxial rods or bars which are subjected to axial tensile or compressive forces. A split cotter inserted through a hole or holes and bent at the ends to fasten. Cotter joint article about cotter joint by the free dictionary. Best six books machine for civil and mechanical engineering best books machine free pdf for civil and mechanical engineering free pdf download theory of machines by r s khurmi, a textbook of machine design by r.
Mar 21, 2016 a short video showing how to insert cotter pin joints into a teddy bear to make the head, arms and legs moveable the same process can be used for other toy animals and dolls. This book is a valuable piece to the students of mechanical engineering at diploma, degree and amie levels. Special tools were once available to insert and remove these cotter pins. Keys, cotter and unit 5 key, cotter and knuckle knuckle. Jul, 2017 chapter 7 cotter and knuckle joints machine design, mechanical engineering mechanical engineering notes edurev notes for mechanical engineering is made by best teachers who have written some of the best books of mechanical engineering. Very large torque or power can be transmitted by both but square key is often preferred. Best books machine free pdf for civil and mechanical.