One rod is fitted with a spigot, which fits inside a socket at the end of the other rod. In a socket and spigot cotter joint, one end of the rods say a is provided with a socket type of. In designing a knuckle joint we have to determine following dimensions. This test is rated positive by 85% students preparing for mechanical engineering. Expired lifetime application number us717035a inventor johnson percy graham morgan. Design a gib and cotter joint with two gibs to resist a safe tensile load of 50 kn.
Design a cotter joint subjected to a tensile load of 35 kn and a. The cotter joint acts as a steam engine connecting rod strap end. Design of cotter joint a cotter is a rectangular element. The draw of the cotter is generally taken as 2 to 3 mm. The effect of stress concentration due to the slot is neglected. Dec 21, 2017 design of socket and spigot cotter joint part number name of part 1 shaft or rod 2 socket 3 spigot 4 cotter 5 socket collar 6 spigot collar mr. Design against static load darshan institute of engineering and. The cotter joint is used between the railway bogies. State the different applications of the cotter joint. When the cotter is hammered, the rods are drawn together and tightened. A backing ring is used inside the pipe joint when making a a butt weld b fillet weld c sleeve weld d socket weld e tube weld.
For example two rods may be joined coaxially and when they are pulled apart they should not. 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 without rotation. The area which resists this action is the projected area of the hole. Video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links. Design of solid and hollow shafts based on strength, rigidity and critical. This cavity or slot is kept slightly out socket and spigot joint front view 32 3 r 50 o 24 3 o24 o30 o66 8 28 40 90 4 40 28 10 r a front view full in section left side view roda socket cotter collara collarb spigot rodb socket and spigot joint fig 4. The socket and the spigot are provided with a narrow rectangular slot. The load is usually acting axially, but it changes its direction and hence the cotter joint must be designed to carry both the tensile and compressive loads. Set screw the rotary unit to the shaft sleeve if seal is supplied with holding clips, remove. Types of cotter joint there are three types 1 socket and spigot cotter joint 2 sleeve cotter joint. The dimensions for a socket and spigot cotter joint may be obtained by considering the.
Sleeve and cotter joint, socket and spigot joint and knuckle joint. The spigot of a cotter joint has a diameter d and carries a slot for cotter. Video lecture on design of cotter joint problems and procedure. This video explains design procedure of socket and spigot type of the cotter joint. Design and draw a cotter joint to support a load varying from 20 kn in from me misc at liberty university. As long as axial forces act, cotter joint can be employed. Mar 06, 2020 a cotter joint, also known as a socket and spigot joint, is a method of temporarily joining two coaxial rods. Following are the three commonly used cotter joints to connect two rods by a cotter. Design of socket and spigot cotter joint the socket and spigot cotter joint is shown in following fig. Wedge action imparts tightening to the cotter joint. The compressive load is taken up by the collar on the spigot.
Each rod is subjected to an axial tensile force of 50 kn. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. The design of these types of joints are discussed, in detail, in the following pages. New delhi 110025 design of socket and spigot cotter joint mohammad afazal, university polytechnic, jmi, new delhi 110025 mohammad afazal, university polytechnic, jmi, new delhi 110025 p load carried by the rod d. Socket and spigot cotter joint solid works part design. Design of socket and spigot cotter joint part number name of part 1 shaft or rod 2 socket 3 spigot 4 cotter 5 socket collar 6 spigot collar mr. Socket and spigot cotter joint and its design engineers. Let p load carried by the rods, d diameter of the rods, d1 outside diameter of socket, d2 diameter of spigot or inside diameter of socket.
Design procedure the dimensions for a socket and spigot cotter joint may be obtained by considering the various modes of failure 1 failure of the rod in tension the rod may fail in. Design of gib and cotter joint for strap end of a connecting rod. Enter the scientific value in exponent format, for example if you have value as 0. Design of cotter joint tap valve bending free 30day. Design a typical cotter joint to transmit a load of 50 kn in tension or compression. On the basis of strength, the material of the two rods and the cotter is selected as plain carbon steel of grade 30c8 syt400mpa step 2. Allowable tensile stress 90 mpa allowable crushing stress 120 mpa allowable shear stress 60 mpa. The assembly consists of inserting the spigot end into the socket end and putting the cotter into their common slot.
Spigot is formed on one of the rods and socket is formed on the other. Keys, cotter and unit 5 key, cotter and knuckle knuckle. The shear plane in case of bolts should a be across. Design of socket and spigot joint bending mechanics. Problem 2 design a cotter joint to transmit a load of 90 kn in tension or compression. Permissible shear stress for the cotter material, and. Socket and spigot cotter joint in a socket and spigot cotter joint, one end of the rods say a is provided with a socket. 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. The fos for the rods, spigot end and socket end is assumed as 6, while for cotter, it is 4. Design cotter joint free download as powerpoint presentation. Select suitable material, fos and draw an informative sketch. When cotter is inserted in slot through socket and spigot and pressed by means of hammer, it becomes tight due to wedge action.
Notation used design procedure the dimensions for a socket and spigot cotter joint may be obtained by considering the various modes of failure 1 failure of the rod in tension the rod may fail in tension due to the tensile load p. The dimensions for a socket and spigot cotter joint may be obtained by. Intooduction types of cotter joints following are the three commonly used cotter joints to connect two rods by a cotter. Socket and spigot cotter joint is used to connect circular rods. Muttagi, slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Designing and building furniture you have to consider a lot of different.
Design a spigot and socket type cotter joint to transmit. Cotter the taper of usually 1 in 24 is provided for following two taper side reasons. Spigot fits inside the socket and the cotter is passed through. Design procedure of cotter joint, socket and spigot joint. Machine design mcq objective question and answers part 3. Can the cotter joint be used to connect slide spindle and fork of valve mechanism. Socket and spigot cotter joints analysis calculation key. Cotter joint the cotter joint offers the following advantages. Design of cotter joint bending strength of materials. The slots in the socket and the spigot align so that a cotter can be inserted to lock the two rods together. The projected area of cylinder in contact over a length t. It is expected that the knowledge gained through the study of different topics and the. Design a cotter joint subjected to a tensile load of 35 kn and a compressive load of 40 kn. If the allowable stresses in tension, compression and shear for the socket, rod.
The 3d models of socket and spigot joint parts socket, spigot, cotter are created using autocadcatia. To apply the design procedure of different fasteners, joints, shafts and couplings. These joints may be subjected to tensile or compressive forces along the axes of the rods. Spigot and socket joint pipes are joined and sealed using either a rolling rubber or a sliding rubber ring respectively. Design a sleeve and cotter joint to resist a tensile load of 60 kn. The assembly of socket and spigot joint was created as per the drawing specification. This ensures tightness of the joint in operating condition and prevents loosening of the parts socket and spigot cotter joint notation used. Solidworks cotter joint assembly design tutorial with details. Design and draw a cotter joint to support a load varying from 30 kn in compression to 30 kn in tension. Design and draw a cotter joint to support a load varying from 20 kn in. This is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. If the allowable stresses in tension, compression and shear for the. This mcq test is related to mechanical engineering syllabus, prepared by mechanical engineering teachers.
Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Saravanakumar, ap acotter joint isusedto connect rigidly two coaxialrods or bars which are subjected to axial tensile or compressive forces. Cotter joint has mainly three components spigot, socket and cotter as shown in figure 2. Design of cotter joint problemsdesign of socket and. Design a socket and spigot cotter joint to connect two steel rods of equal diameter.
The socket and spigot cotter joint is shown in fig 2. Assume the following stresses for socket, spigot and cotter. The design of these types of joints are discussed, in detail. 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. The assembly and dismantling of parts of the cotter joint is quick and simple. A spigotandsocket joint for connecting two pipes, comprising a socket end assigned to one pipe and into which a spigot end of the other pipe, which has a support strip, can be inserted and which has a radially inwardprotruding edge with at least one ring segmentshaped recess, and a locking device for locking the spigot end in the socket end. All parts of the joint are made of the same material with the following allowable. Which of the following is not a part of cotter joint. Cotter joint has mainly three components spigot, socket and cotter as shown in figure 9. Design of socket and spigot cotter joint slideshare. Material of two rods and cotter is steel 30 c8 s yt 400nmm2, s yc 2 s yt and s sy 0. Ther are two reasons for assuming a lower fos for the cotter.
Keys, cotter and unit 5 key, cotter and knuckle knuckle joints joints structure 5. Cotter joint 10 questions mcq test has questions of mechanical engineering preparation. Levelii co4 2 design a sleeve and cotter joint to resist a tensile load of 60 kn. Explain the design process for spigot and socket cotter joint with neat sketch. Machine design by r s khurmi j k gupta pdf downlode. It is usually used in connecting a piston rod to the crosshead of a reciprocating steam engine, a piston rod and its extension as a tailor pump rod, strap end of connecting rod etc. To understand the design steps let take a question and solve it step by step. It consist of 1 spigot 2 socket cotter application. All parts of the joint are made of same material with the following allowable stresses. It is used to connect two coaxial rods which are subjected to either axial tensile or axial compressive load.
Unit 5 key, cotter and knuckle joints dpg polytechnic. One of the rods is formed into a socket by enlarging its end while the other rod, called spigot end is formed with enlarged diameter and an integral collar the spigot is put inside the socket and the cotter is driven through the slots in socket and spigot ends. Design and draw a cotter joint to support a load varying from. Technocrats, architects, draftsmen, surveyors, designers and many other professionals in the. Socket and spigot cotter joint the socket and spigot cotter joint is shown in fig. The sliding rubber ring is installed using a soft soap lubricant. It acts as a joint between the crosshead and the piston rod of steam engine. Sleeve cotter joint pdf the working of the cotter andsleeve and cotter and gib are shown below. The factor of safety for rods, spigot end and socket end. Design of cotter joint in hindi is discusseddesign of cotter joint in catiadesign of knuckle. Design procedure of cotter joint, socket and spigot joint design. The drawings of socket, spigot, and cotter are studied. Bookmark file pdf mechanical drawing and design n6 exam paper. The socket and spigot cotter joint is shown in fig.
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