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. The assembly and dismantling of parts of the cotter joint is quick and simple. 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. Sleeve and cotter joint, socket and spigot joint and. Module 5 design of keys, cotters and knuckle joints.
This test is rated positive by 90% students preparing for mechanical engineering. It acts as a joint between the crosshead and the piston rod of steam engine. Explain the design process for spigot and socket cotter joint with neat sketch. Select suitable material, fos and draw an informative sketch. When the designer mostly adopts the existing design without changes is known as a. Design of socket and spigot joint bending mechanics. As long as axial forces act, cotter joint can be employed. Problem 2 design a cotter joint to transmit a load of 90 kn in tension or compression. The end of the rod which goes into a socket is also called spigot.
The factor of safety for rods, spigot end and socket end. Solidworks cotter joint assembly design tutorial with. Prepare the trench bed make a recess in the bed to accommodate the pipe. Design procedure of cotter joint, socket and spigot joint design. Design a spigot and socket type cotter joint to transmit. Aim design and drawing of cotter joint function a cotter joint is. Design a cotter joint subjected to a tensile load of 35 kn and a. Types of cotter joints socket and spigot cotter joint. 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. All parts of the joint are made of same material with the following allowable stresses.
Muttagi, slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The socket and the spigot are provided with a narrow rectangular slot. Cotter joint has mainly three components spigot, socket and cotter as shown in figure 2. Computer aided design using any sotware such as auto cad ideas etc. Spigot fits inside the socket and the cotter is passed through. For example two rods may be joined coaxially and when they are pulled apart they should not. Design of keys, stresses in keys cotter joints spigot and socket, sleeve and cotter, jib and cotter joints knuckle joints. It is used to connect two coaxial rods which are subjected to either axial tensile or axial compressive load. Each rod is subjected to an axial tensile force of 50 kn. The compressive load is taken up by the collar on the spigot. Sleeve and cotter joint, socket and spigot joint and knuckle joint. Design a gib and cotter joint with two gibs to resist a safe tensile load of 50 kn.
Joints between the piston rod and the cross need of the steam engine. Which is more then the allowable crushing stress is 80nmm2so, increase the outer dia of socket is 70mm. This video explains design procedure of socket and spigot type of the cotter joint. Digital differential integratorprinciple of operation, exponential declaration. Material of two rods and cotter is steel 30 c8 s yt 400nmm2, s yc 2 s yt and s sy 0. Design of socket itension failure of the socket at the location of centre. Video lecture on design procedure of cotter joint, socket and spigot joint from design of cotter joint, knuckle joint,levers and offset links.
When cotter is inserted in slot through socket and spigot and pressed by means of hammer, it becomes tight due to wedge action. It consist of 1 spigot 2 socket cotter application. Ther are two reasons for assuming a lower fos for the cotter. Socket and spigot cotter joint is used to connect circular rods. Keys, cotter and unit 5 key, cotter and knuckle knuckle.
Clean the socket end brush and wipe the end of the pipe fitted previously to remove any particles or water, ensure that the receiving socket is clean and undamaged. In a socket and spigot cotter joint, one end of the rods is provided with a socket type of end as shown in figure and the other end of the rod is inserted into a socket. Design of socket and spigot cotter joint the socket and spigot cotter joint is shown in following fig. Within the elastic limit, \\tau g\gamma\, where, \\gamma \ is shear strain and g is.
Design a socket and spigot joint to resist a tensile load of 28 kn. Failure of cotter joint may causes accident, so it is necessary to design cotter joint to. Let, p load carried by the rods, d diameter of the rods, d 1. Assemble these parts correctly, and then draw the following views using scale 1.
Design a typical cotter joint to transmit a load of 50 kn in tension or compression. These joints may be subjected to tensile or compressive forces along the axes of the rods. Allowable tensile stress 90 mpa allowable crushing stress 120 mpa allowable shear stress 60 mpa. Assume the following stresses for socket, spigot and cotter. Chapter 7 cotter and knuckle joints machine design.
Keys, cotter and unit 5 key, cotter and knuckle knuckle joints joints structure 5. 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. Mar 06, 2020 a cotter joint, also known as a socket and spigot joint, is a method of temporarily joining two coaxial rods. Can the cotter joint be used to connect slide spindle and fork of valve mechanism. Figure shows the details of the parts of an socket and spigot cotter joint. If the allowable stresses in tension, compression and shear for the socket, rod. The socket and spigot cotter joint is shown in fig. Machine design by r s khurmi j k gupta pdf downlode.
One rod is fitted with a spigot, which fits inside a socket at the end of the other rod. Wedge action imparts tightening to the cotter joint. The cotter joint is used between the railway bogies. Design a socket and spigot cotter joint to connect two steel rods of equal diameter. Socket and spigot cotter joint the socket and spigot cotter joint is shown in fig. It is required to design a cotter joint to connect two steel rods of. Figure shows the details of the parts of an socket and spigot. 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. When the cotter is hammered, the rods are drawn together and tightened. 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. Which joint is used to connect piston rod and cross head of steam engine. It is usually used in connecting a position rods to the cross head of a reciprocating steam engine, strap end of connecting rod etc. This ensures tightness of the joint in operating condition and prevents loosening of the parts socket and spigot cotter joint notation used.
Socket and spigot cotter joint and its design engineers. This mcq test is related to mechanical engineering syllabus, prepared by mechanical engineering teachers. Permissible shear stress for the cotter material, and. Design and draw a cotter joint to support a load varying from 30 kn in compression to 30 kn in tension. 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. Following are the three commonly used cotter joints to connect two rods by a cotter. This is used to connect rigidly two rods which transmit motion in the axial direction, without rotation. All the parts of the joint are made from same material with following allowable stresses.
Cotter joint the cotter joint offers the following advantages. Line up the pipes carefully centre the spigot within the socket. Design a cotter joint subjected to a tensile load of 35 kn and a compressive load of 40 kn. A cotter joint is a temporary fastening and is used to connect rigidly to coaxial shafts which are subjected to axial tensile or compressive forces.
The draw of the cotter is generally taken as 2 to 3 mm. 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. A cotter joint is temporary joint and used to connect two coaxial rods or bars which are subjected to axial tensile and or compressive forces. The slots in the socket and the spigot align so that a cotter can be inserted to lock the two rods together. 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 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. Design a sleeve and cotter joint to resist a tensile load of 60 kn. Solidworks cotter joint assembly design tutorial with details. State the different applications of the cotter joint. Cotter joint 10 questions mcq test has questions of mechanical engineering preparation. Sleeve cotter joint pdf the working of the cotter andsleeve and cotter and gib are shown below.
Design of socket and spigot cotter joint slideshare. 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. The effect of stress concentration due to the slot is neglected. Cotter joint has mainly three components spigot, socket and cotter as shown in figure 9. Design of gib and cotter joint for strap end of a connecting rod. If the allowable stresses in tension, compression and shear for th. The cotter joint acts as a steam engine connecting rod strap end.
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. A cotter joint is used to connect one end of a rod is provided with a socket type of end and the other end of the rod is inserted to a socket. Which of the following is not a part of cotter joint. Socket and spigot cotter joint sleeve and cotter joint gib and cotter joint applications. Design a gib and cotter joint with two gibs to resist a. The fos for the rods, spigot end and socket end is assumed as 6, while for cotter, it is 4. Saravanakumar, ap acotter joint isusedto connect rigidly two coaxialrods or bars which are subjected to axial tensile or compressive forces. The spigot of a cotter joint has a diameter d and carries a slot for cotter. Cotter joint is widely used to connect the piston rod and cross head of the steam engine, so as a joint between the piston rod and the tailor pump rod, foundation bolt etc. Within the elastic limit, \\tau g\ gamma \, where, \\ gamma \ is shear strain and g is.
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