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Milling Machine : Basic milling machine interview questions  and answers . Viva , objective , oral examination questions for Mechanical...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/basic-of-milling-machine-interview-question-and-answers/" aria-label="View Post: Basic Of Milling Machine | Interview Question and answers">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Basic Of Milling Machine | Interview Question and answers","url":"\/\/www.gunkrazy.com\/basic-of-milling-machine-interview-question-and-answers\/","articleBody":"Basic Of Milling Machine | Interview Question and answers\r\nMilling Machine : Basic milling machine interview questions\u00a0 and answers . Viva , objective , oral examination questions for Mechanical Students .\r\nMILLING MACHINE QUESTION AND ANSWERS\u00a0\r\n1. What are the specifications of milling machine?.\r\n\r\nThe table length and width, Maximum longitudinal cross and vertical travel of the table, number of spindle speeds and feeds, Power of driving motor, Floor space and net weight.\r\n\r\nRead more :\u00a0Specification of Machine Tools - Lathe, Milling, Drilling, Shaping\r\n\r\n2. Classify milling machine.\r\n\r\n1. Column and knees type \u2013\r\na. plain milling machine,\r\nb.Vertical milling machine,\r\nc. Universal milling machine,\r\nd. Ram- type milling machine,\r\ne. Omniversal milling machine.\r\n\r\n2. Bed-Type milling machine \u2013\r\na. simplex milling machine\r\nb. duplex milling machine\r\nc. Triplex milling machine.\r\n\r\n3. Plano-type milling machine.\r\n\r\n4. Special purpose milling machine \u2013\r\na. Rotary table milling machine\r\nb. Drum milling machine\r\nc. Profile milling machine.\r\n\r\nRead more :\u00a0Milling Process -Definition , Milling Manufacturing Processes\r\n\r\n3. List the principle parts of horizontal or plain milling machine.\r\n\r\nBase, column, knee, saddle, table, overarm and arbor.\r\n\r\n4. How omniversal milling machine differs from universal milling machine?.\r\n\r\nThis is a modified form of a plain milling machine. It is provided with two spindles, one of which is in the horizontal plane while the other is carried by a universal swiveling head.\r\n\r\n5. Classify bed type milling machine.\r\n\r\nSimplex, duplex and triplex machine.\r\n\r\n6. What are the various types of special purpose milling machines?.\r\n\r\nRotary table or continuous milling machine, Drum type milling machine Profile or contour milling machine.\r\n\r\n7. List the various types of milling attachments.\r\n\r\nVertical milling attachment, universal milling attachment, High speed milling attachment, Rotary attachment, slotting attachment, Rack milling attachment, Universal spiral milling machine.\r\n\r\nRead more :\u00a010 Types Of Milling Machine accessories and Attachments\r\n\r\nMilling Machine Attachments\r\n\r\n8. What are the advantages of up milling process?\r\n\r\nIt does not require a backlash eliminator. Safer operation due to separating forces between cutter and work.\r\n\r\n9. Write any ten nomenclature of plain milling processes.\r\n\r\nBody of cutter, cutting edge, face fillet, Gash, Lead, Land, Outside diameter, Root diameter, Cutter Angles.\r\n\r\n10. Classify peripheral milling processes.\r\n\r\nUp milling or conventional milling, Down milling or climb milling.\r\n\r\n11. What are the advantages of down milling process?\r\n\r\nCutter with higher rake angles can be used. This reduces power requirements. Cutter wear is less because chip thickness is maximum at the start of the cut.\r\n\r\n12. Define \u201cface milling\u201d.\r\n\r\nFace milling is the operation performed by a milling cutter to produce flat machined surfaces perpendicular to the axis of rotation.\r\n\r\n13. What is meant by plain or slab milling.\r\n\r\nPlain or slab milling is the operation of producing flat horizontal surface parallel to the axis of the cutter using a plain or slab milling cutter.\r\n\r\n14. List out various milling operations.\r\n\r\nPlain milling, Face milling, Angular milling, Straddle milling, Gang milling, Form milling, End milling, T-slot milling, Gear cutting.\r\n\r\nRead more :\u00a0Operation Performed On Milling machine With Diagrams\r\n\r\n15. Define Straddle and Gang milling.\r\n\r\nStraddle milling operation is the production of two vertical flat surfaces on the both sides of the job by using two side milling cutters which are separated by collars. Gang milling is the production of many surfaces of a job simultaneously by feeding the table against a number of required cutters.\r\n\r\n16. What is meant by term indexing?\r\n\r\nIndexing is the process of dividing the periphery of a job in to equal number of divisions.\r\n\r\n17. What are the three types of dividing heads?. \r\n\r\nPlain or simple dividing head, Universal dividing head, Optical dividing head.\r\n\r\n18. What is cam milling?\r\n\r\nCam milling is the operation of producing cams in a milling machine by the use of a universal dividing head and a vertical milling attachment.\r\n\r\n19. What are the specifications of milling machine?.\r\n\r\nThe table length and width, Maximum longitudinal cross and vertical travel of the table, number of spindle speeds and feeds, Power of driving motor, Floor space and net weight.","headline":"Basic Of Milling Machine | Interview Question and answers","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-03-12","mainEntityOfPage":"False","dateModified":"February 22, 2020","image":{"@type":"ImageObject","url":"","height":0,"width":0},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/standard-g-code-and-m-code-cnc-programming-basics/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/03/example-of-part-programming-182x300.jpg')"></div><span class="sr-only">link to Standard G Code and M Code | CNC programming basics</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/standard-g-code-and-m-code-cnc-programming-basics/">Standard G Code and M Code | CNC programming basics</a></p></header><div class="excerpt"><p>Standard G Code and M Code | CNC programming basics
CNC part Programming :
The part programming contains the list of coordinate values along the X, Y and Z directions of the entire tool path to...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/standard-g-code-and-m-code-cnc-programming-basics/" aria-label="View Post: Standard G Code and M Code | CNC programming basics">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Standard G Code and M Code | CNC programming basics","url":"\/\/www.gunkrazy.com\/standard-g-code-and-m-code-cnc-programming-basics\/","articleBody":"Standard G Code and M Code | CNC programming basics\r\nCNC part Programming :\r\nThe part programming contains the list of coordinate values along the X, Y and Z directions of the entire tool path to finish the component. The program should also contain information, such as feed and speed. Each of the necessary instructions for a particular operation given in the part program is known as an NC word. A group of such NC words constitutes a complete NC instruction, known as block. The commonly used words are N, G, F, S, T, and M. The same is explained later on through examples. \r\n\r\nHence the methods of part programming can be of two types depending upon the two techniques as below\r\n\r\n(a) Manual part programming,and\r\n(b) Computer aided part programming\r\n\r\nRead more :\u00a0Bobcad CAM - CNC programming software for Machining ,Turning\r\n\r\nexample of part programming\r\nSTANDARD G AND M CODES\r\nThe most common codes used when programming NC machines tools are G-codes (preparatory functions), and M codes (miscellaneous functions). Other codes such as F, S, D, and T are used for machine functions such as feed, speed, cutter diameter offset, tool number, etc. G-codes are sometimes called cycle codes because they refer to some action occurring on the X, Y, and\/or Z-axis of a machine tool. The G-codes are grouped into categories such as Group 01, containing codes G00, G01, G02, G03, which cause some movement of the machine table or head. Group 03 includes either absolute or incremental programming. A G00 code rapidly positions the cutting tool while it is above the work piece from one point to another point on a job. During the rapid traverse movement, either the X or Y-axis can be moved individually or both axes can be moved at the same time. The rate of rapid travel varies from machine to machine. \r\n\r\nThe total numbers of these codes are 100, out of which some of important codes are given as under with their functions :\r\nG-Codes (Preparatory Functions)\r\n\r\n \tG00 Rapid positioning\r\n \tG01 Linear interpolation\r\n \tG02 Circular interpolation clockwise (CW)\r\n \tG03 Circular interpolation counterclockwise (CCW)\r\n \tG20 Inch input (in.)\r\n \tG21 Metric input (mm)\r\n \tG24 Radius programming\r\n \tG28 Return to reference point\r\n \tG29 Return from reference point\r\n \tG32 Thread cutting\r\n \tG40 Cutter compensation cancel\r\n \tG41 Cutter compensation left\r\n \tG42 Cutter compensation right\r\n \tG43 Tool length compensation positive (+) direction\r\n \tG44 Tool length compensation minus (-) direction\r\n \tG49 Tool length compensation cancels\r\n \tG 53 Zero offset or M\/c reference\r\n \tG54 Settable zero offset\r\n \tG84 canned turn cycle\r\n \tG90 Absolute programming\r\n \tG91 Incremental programming\r\n\r\nM-Codes (Miscellaneous Functions)\r\n\r\nM or miscellaneous codes are used to either turn ON or OFF different functions, which control certain machine tool operations. M-codes are not grouped into categories, although several codes may control the same type of operations such as M03, M04, and M05, which control the machine tool spindle. Some of important codes are given as under with their functions\r\n\r\n \tM00 Program stop\r\n \tM02 End of program\r\n \tM03 Spindle start (forward CW)\r\n \tM04 Spindle start (reverse CCW)\r\n \tM05 Spindle stop\r\n \tM06 Tool change\r\n \tM08 Coolant on\r\n \tM09 Coolant off\r\n \tM10 Chuck - clamping\r\n \tM11 Chuck - unclamping\r\n \tM12 Tailstock spindle out\r\n \tM13 Tailstock spindle in\r\n \tM17 Tool post rotation normal\r\n \tM18 Tool post rotations reverse\r\n \tM30 End of tape and rewind or main program end\r\n \tM98 Transfer to subprogram\r\n \tM99 End of subprogram","headline":"Standard G Code and M Code | CNC programming basics","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-03-12","mainEntityOfPage":"False","dateModified":"February 22, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/03\/example-of-part-programming-182x300.jpg","height":300,"width":182},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/procedure-of-helical-gear-cutting-on-milling-machine/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/03/helical-gear-calculation-300x118.jpg')"></div><span class="sr-only">link to Procedure of Helical Gear Cutting On Milling machine</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/procedure-of-helical-gear-cutting-on-milling-machine/">Procedure of Helical Gear Cutting On Milling machine</a></p></header><div class="excerpt"><p>Procedure of Helical Gear Cutting On Milling machine
Helical Gears
Unlike Spur gears, Helical gears and Helical Gearbox both have the capacity to conduct a smooth operation. The teeth on a...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/procedure-of-helical-gear-cutting-on-milling-machine/" aria-label="View Post: Procedure of Helical Gear Cutting On Milling machine">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Procedure of Helical Gear Cutting On Milling machine","url":"\/\/www.gunkrazy.com\/procedure-of-helical-gear-cutting-on-milling-machine\/","articleBody":"Procedure of Helical Gear Cutting On Milling machine\r\nHelical Gears\r\nUnlike Spur gears, Helical gears and\u00a0Helical Gearbox\u00a0both have the capacity to conduct a smooth operation. The teeth on a helical gear cut at an angle to the face of the gear. So, during the process when two of the teeth start to engage, the contact is gradual- starting at one end of the tooth and maintaining contact as the gear rotates into full engagement. When it comes to transmissions, helical is the most commonly used gears and it even generates large amounts of thrust.\r\n\r\nRead more :\u00a0Design and Analysis of Helical Blade Wind Turbine Mechanical Project\r\n\r\nGear Cutting Methods :\r\n\r\n19 Methods Of Manufacturing Of all types of Gears\r\nHelical gear cutting on Milling Machine\u00a0\r\nAIM:\r\nTo make a helical gear from a CI blank using milling machine\r\n\r\nMATERIAL REQUIRED :\r\nCast iron blank of \u042450 mm\r\n\r\nTOOLS REQUIRED :\r\n\r\n1. Turning tool\r\n2. Milling cutter ( 2 mm module )\r\n3. Vernier caliper ( 0- 150 mm)\r\n4. Drilling tool \u0424 10 mm ,\u042420 mm\r\n5. Mandrel \u0424 20 mm\r\n6. Spanner\r\n7. Gear tooth Vernier\r\n\r\nFORMULA :\r\nOuter diameter = (N+2) M,\r\nModule =OD\/ (N+2),\r\nNo .of teeth = (OD\/M) -2\r\nN- Number of teeth\r\nM=module\r\nOD= outer diameter\r\n\r\nPROCEDURE OF HELICAL GEAR CUTTING :\r\n1. Turn the given CI bank to required diameter in centre lathe.\r\n2. Drill a hole in the blank of diameter equal to mandrel size.\r\n3. Fix the blank between two centers of the dividing head using mandrel.\r\n4. Set the milling cutter on the machine spindle and select the suitable speed.\r\n5. Raise the table (knee) vertically up until blank touches the cutter.\r\n6. Calculate depth of cut and indexing calculation from module &amp; number of teeth.\r\n7. Give the depth of cut by raising the knee up.\r\n8. According to index calculation set the dividing head.\r\n9. Switch on the spindle and feed the blank against the rotating cutter by reciprocating the table\r\n10. Move the index arm on the index plate according to the calculated number of holes.\r\n11. Feed the blank against the rotating cutter to cut the next tooth.\r\n12. Repeat the same for remaining teeth\r\n\r\n helical gear calculation\r\n\r\nMODEL CALCULATION FOR HELICAL GEAR:\r\n\r\nNo of teeth(z) = 30\r\n\r\nModule(m) = 2 mm\r\n\r\nExternal dia. of blank = (z+2)*m\r\n= (30+2)*2=64\r\n\r\nDepth of cut =2.25*m\r\n= 2.25*2\r\n= 4.5 mm\r\n\r\nThe indexing crank rotation = one complete rotation and move arm holes in 33 concentric circle.\r\n\r\nRead more ;\u00a0Procedure Of Spur Gear Cutting on Milling machine","headline":"Procedure of Helical Gear Cutting On Milling machine","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-03-12","mainEntityOfPage":"False","dateModified":"February 22, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/03\/helical-gear-calculation-300x118.jpg","height":118,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/procedure-of-spur-gear-cutting-on-milling-machine/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/03/spur-gear-cutting-300x154.jpg')"></div><span class="sr-only">link to Procedure Of Spur Gear Cutting on Milling machine</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/procedure-of-spur-gear-cutting-on-milling-machine/">Procedure Of Spur Gear Cutting on Milling machine</a></p></header><div class="excerpt"><p>Procedure Of Spur Gear Cutting on Milling machine - How to Manufacture Spur Gear 
Gears are most important power transmission device used in mechanical assemblies. Gears are varies with respect to...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/procedure-of-spur-gear-cutting-on-milling-machine/" aria-label="View Post: Procedure Of Spur Gear Cutting on Milling machine">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Procedure Of Spur Gear Cutting on Milling machine","url":"\/\/www.gunkrazy.com\/procedure-of-spur-gear-cutting-on-milling-machine\/","articleBody":"Procedure Of Spur Gear Cutting on Milling machine - How to Manufacture Spur Gear\u00a0\r\nGears are most important power transmission device used in mechanical assemblies. Gears are varies with respect to \u00a0types , size , module, numbers of\u00a0teeth\u00a0on gears. Further gears may vary depending on pressure ration and pitch circle diameter. There are some manufacturing methods are available for producing the gears.\r\n\r\n\r\nGear manufacturing can be divided into two categories namely forming and machining as\u00a0shown in flow chart in Fig . Forming consists of direct casting, molding, drawing, or\u00a0extrusion of tooth forms in molten, powdered, or heat softened materials and machining\u00a0involves roughing and finishing operations.\r\n\r\n\r\nMethods Of Manufacturing Of all types of Gears\r\n\r\n19 Methods Of Manufacturing Of all types of Gears\r\n\r\n\r\nSpur gear Cutting on Milling Machine :\r\n\r\n\r\nAIM:\r\nTo machine gear to the given module and number of teeth in the given work piece.\r\n\r\nTOOLS AND EQUIPMENT'S REQUIRED:\r\n1. Milling machine\r\n2. Vernier caliper\r\n3. Mandrel.\r\n\r\n\r\n\r\nPROCEDURE:\r\n\r\n1. Calculate the gear tooth proportions.\r\nWhere,\r\nBlank diameter = (Z + 2) m\r\nTooth depth = 2.25 m\r\nTooth width = 1.5708 m\r\nZ = Number of teeth required\r\nm = module\r\nIndexing calculation\r\nIndex crank movement = 40 \/ Z\r\n\r\n2. The dividing head and the tail stock are bolted on the machine table. Their axis must be set parallel to the machine table.\r\n3. The gear blank is held between the dividing head and tail stock using a mandrel. The mandrel is connected with the spindle of dividing head by a carrier and catch plate.\r\n4. The cutter is mounted on the arbor. The cutter is centered accurately with the gear blank.\r\n5. Set the speed and feed for machining.\r\n6. For giving depth of cut, the table is raised till the periphery of the gear blank just touches the cutter.\r\n7. The micrometer dial of vertical feed screw is set to zero in this position.\r\n8. Then the table is raised further to give the required depth of cut.\r\n9. The machine is started and feed is given to the table to cut the first groove of the blank.\r\n10. After the cut, the table is brought back to the starting position.\r\n11. Then the gear blank is indexed for the next tooth space.\r\n12. This is continued till all the gear teeth are cut.\r\n\r\nCALCULATION:\r\n\r\nZ = No.of teeth = 23\r\nm = module = 2 mm\r\n\r\nBlank Diameter = (Z + 2) *m\r\n= (23 + 2) *2\r\n= 50 mm\r\n\r\nTooth Depth = 2.25 m\r\n= 2.25 *2\r\n= 4.5 mm\r\n\r\nIndexing Calculation\r\n= 40 \/ Z\r\n= 40 \/ 23\r\n= 1.739\r\n\r\n&nbsp;","headline":"Procedure Of Spur Gear Cutting on Milling machine","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-03-12","mainEntityOfPage":"False","dateModified":"February 22, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/03\/spur-gear-cutting-300x154.jpg","height":154,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/feed-check-valve-diagram-working-boiler-mounting-and-accessories/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/03/feed-check-valve-233x300.jpg')"></div><span class="sr-only">link to Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/feed-check-valve-diagram-working-boiler-mounting-and-accessories/">Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories</a></p></header><div class="excerpt"><p>Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories
BOILER MOUNTINGS AND ACCESSORIES  Boiler mountings are the devices mounted on the boiler surface for safe operation, efficient...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/feed-check-valve-diagram-working-boiler-mounting-and-accessories/" aria-label="View Post: Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories","url":"\/\/www.gunkrazy.com\/feed-check-valve-diagram-working-boiler-mounting-and-accessories\/","articleBody":"Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories\r\nBOILER MOUNTINGS AND ACCESSORIES\r\n\r\nBoiler mountings are the devices mounted on the boiler surface for safe operation, efficient working, control steam generation and easy maintenance of the boiler.\r\n\r\nIn accordance with the Indian boiler regulation the following mountings should be fitted to the boilers.\r\n\r\n \tTwo safety valves- Click here for more info.\r\n \tTwo water level indicators - Click here for more information\u00a0\r\n \tA pressure gauge\r\n \tA steam stop valve\r\n \tA feed check valve\r\n \tA blow-off cock\r\n \tAn attachment for inspector\u2019s test gauge\r\n \tA man hole\r\n \tMud holes or sight holes\r\n\r\nRead more :\u00a0Introduction to Boilers | Classification Of Boilers\r\nA feed check valve\r\nFunction of Feed Check valve\u00a0\r\n\r\nTo control the supply of water to the boiler and to prevent the escaping of water from the boiler when the pump pressure is less or pump is stopped. \r\n\r\n feed check valve\r\n\r\nDescription:\r\n\r\nThe feed check valve is fitted in the water space of the boiler slightly below the normal level of the water. It consists of a check valve CV which moves automatically up and down under the pressure of water on its gun metal seat. FV is the feed check valve which can be raised or lowered on its gun metal seat, thereby opening the delivery passage and its opening controls simultaneously lift of the check valve CV. F is the flange which is bolted to the front end of the boiler shell at a point from which an internally perforated pipe leads the feed water and distributes it near the working level of the water in the boiler. The feed check valve CV is operated by the hand wheel H to control the supply of water to the boiler to maintain the water level constant.\r\n\r\nWorking:\r\n\r\nDuring normal operation the feed valve may be lifted due to the pressure of water from the feed pump and water may be fed into the boiler. When the pump stops working, the pump pressure is less than the boiler pressure; the valve may be closed to its\u00a0 automatically due to the pressure of water from the boiler.\r\nIt is very important to check that the non-return valve (CV) is in good condition as it is subjected to automatic upward and downward movement due to the fluctuations in the feed water pressures. The valve CV can be inspected for repair by fully closing the valve FV. If the boiler is in operation it should be seen that there is sufficient water in the boiler before such work is undertaken.","headline":"Feed Check Valve Diagram ,Working | Boiler Mounting and Accessories","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-03-12","mainEntityOfPage":"False","dateModified":"February 22, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/03\/feed-check-valve-233x300.jpg","height":300,"width":233},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <article class="article-card horizontal "> <a href="//www.gunkrazy.com/fusible-plug-diagram-working-boiler-mounting-and-accessories/" rel="nofollow"><div class="image-container" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2019/03/diagram-of-fusible-plug-300x244.jpg')"></div><span class="sr-only">link to Fusible plug Diagram, Working | Boiler Mounting and Accessories</span></a><div class="copy-container"><header><p><a style="color: #ff392e!important" href="//www.gunkrazy.com/fusible-plug-diagram-working-boiler-mounting-and-accessories/">Fusible plug Diagram, Working | Boiler Mounting and Accessories</a></p></header><div class="excerpt"><p>Fusible plug Diagram, Working | Boiler Mounting and Accessories
BOILER MOUNTINGS AND ACCESSORIES  Boiler mountings are the devices mounted on the boiler surface for safe operation, efficient...</p><div class="button-container"><a rel="nofollow" class="button reverse" href="//www.gunkrazy.com/fusible-plug-diagram-working-boiler-mounting-and-accessories/" aria-label="View Post: Fusible plug Diagram, Working | Boiler Mounting and Accessories">View Post</a></div></div></div></article> <script type="application/ld+json">{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","name":"Fusible plug Diagram, Working | Boiler Mounting and Accessories","url":"\/\/www.gunkrazy.com\/fusible-plug-diagram-working-boiler-mounting-and-accessories\/","articleBody":"Fusible plug Diagram, Working | Boiler Mounting and Accessories\r\nBOILER MOUNTINGS AND ACCESSORIES\r\n\r\nBoiler mountings are the devices mounted on the boiler surface for safe operation, efficient working, control steam generation and easy maintenance of the boiler.\r\n\r\nIn accordance with the Indian boiler regulation the following mountings should be fitted to the boilers.\r\n\r\n \tTwo safety valves- Click here for more info.\r\n \tTwo water level indicators - Click here for more information\u00a0\r\n \tA pressure gauge\r\n \tA steam stop valve\r\n \tA feed check valve\r\n \tA blow-off cock\r\n \tAn attachment for inspector\u2019s test gauge\r\n \tA man hole\r\n \tMud holes or sight holes\r\n\r\nRead more :\u00a0Introduction to Boilers | Classification Of Boilers\r\n\r\nFunction of Fusible Plug :\u00a0\r\n\r\nTo protect the boiler against damage due to overheating for low water level.\r\n\r\ndiagram of fusible plug\r\n\r\nDescription:\r\n\r\nIt is fitted on the fire box crown plate or over the combustion chamber at its approprirate place.\r\n\r\nA common form of fusible plug is illustrated in Fig. It consists of a hollow gun metal body screwed into the fire box crown: The body has a hexagonal flange to tighten it into the shell. A gun metal plug having a hexagonal flange is screwed into the gun metal body. There is another hollow gun metal plug separated from the metal plug by an annulus of fusible metal. The fusible metal is protected from fire by flange on the hollow gun metal plug.\r\n\r\nWorking:\r\n\r\nUnder normal condition when the water-level in the boiler shell is normal, the fusible plug is fully submerged under water. In this case, the heat from the fusible plug is being conducted to water which keeps the fusible metal at an almost constant temperature and below its melting point. But when the water level falls below the fusible plug, it gets uncovered from water and is exposed to steam. The heat conduction from the fusible plug to steam is very little compared with that to water. Hence fusible plug becomes overheated and it melts with the result that the hollow gun metal plug falls down making a hole. The steam and water being under pressure immediately rush to fire box and extinguish the fire.\r\n\r\nThe fusible plugs should generally be renewed after a period of about two years as they are liable to become defective over a long period of use (because they are subjected to heat on one side and scale deposits on the other).","headline":"Fusible plug Diagram, Working | Boiler Mounting and Accessories","author":{"@type":"Person","name":"Sachin Thorat","url":"\/\/www.gunkrazy.com\/"},"datePublished":"2019-03-12","mainEntityOfPage":"False","dateModified":"February 22, 2020","image":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2019\/03\/diagram-of-fusible-plug-300x244.jpg","height":244,"width":300},"publisher":{"@context":"http:\/\/schema.org\/","@type":"Organization","name":"Learn Mechanical Engineering","logo":{"@type":"ImageObject","url":"\/\/www.gunkrazy.com\/wp-content\/uploads\/2020\/01\/learn-mech-logo-1-300x300.png","height":600,"width":60}}}</script> <nav class="pagination-wrapper" aria-label="article pagination"> <a class="prev page-numbers" href="?page_num=111">&laquo; PREV</a> <a class="page-numbers" href="?page_num=1"><span class="screen-reader-text">Page </span>1</a> <span class="page-numbers dots">&hellip;</span> <a class="page-numbers" href="?page_num=110"><span class="screen-reader-text">Page </span>110</a> <a class="page-numbers" href="?page_num=111"><span class="screen-reader-text">Page </span>111</a> <span aria-current="page" class="page-numbers current"><span class="screen-reader-text">Page </span>112</span> <a class="page-numbers" href="?page_num=113"><span class="screen-reader-text">Page </span>113</a> <a class="page-numbers" href="?page_num=114"><span class="screen-reader-text">Page </span>114</a> <span class="page-numbers dots">&hellip;</span> <a class="page-numbers" href="?page_num=338"><span class="screen-reader-text">Page </span>338</a> <a class="next page-numbers" href="?page_num=113">NEXT &raquo;</a></nav></section></main><aside id="secondary" class="widget-area"><div class="about-wrapper"><h2 class="widget-title" style="background: #d693c6; color: #ff392e">About Us</h2><div class="about-image" style="background-image: url('//www.gunkrazy.com/wp-content/uploads/2020/03/Sachin-Thorat-300x300-min.png')"></div><p class="about-copy">LearnMech.Com is a Mechanical Project-oriented platform run by Sachin Thorat who is a B-Tech Graduate in Mechanical Engineering. 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