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      • Harsimran Singh Banwait

        i am dream and u are dreamer
        · 0 replies
      • Hassan Saddam Yusfu

        be nice to all, forgive for every past hour, you will enjoy the world 
        · 0 replies
      • Rahul kumar Azad


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      • Vrajendra Vyas

         What are Hydrogenfuelcell cars/vehicles? Hydrogen can be used to power vehicles in two ways. It can be burned using a hydrogen internal combustion engine (sometimes called an H2ICE), which is basically a modified gasoline engine. It can also be used in afuelcell. Unlike a traditional car engin...
        · 0 replies
      • Aadi sid

        All group are full i requested you please create a new group
        · 0 replies
      • Gaurang Trivedi

        TrueCADD is an offshore AutoCAD Outsourcing Company India which owns the resource, experience and capabilities of providing an excellent scope of engineering design, drafting and 3d modeling services. 
        · 0 replies
      • Paulo Teixeira

        The Versatility of a Mechanical Engineer!
        Nowadays, a mechanical engineering can do many things. Our expertise covers the industrie, management, operations, logistics and so on. We are trained to do the best and take the most of what we can using the minimum resources as possible, keeping the costs low and using the shortest time possible in order to execute any task.
        Thanks to our criticism using numbers we have a different perspective from "normal people". We are trained to be the most accurate, objective and practical as possible!
        And this a perspective of a Mechanical Engineering to be! Thank you for your attention.
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      • Md Morshadul alam sohel

         i have a intarastat  CNC letha opperating 
        · 2 replies
      • Makbul Badi  »  umama

        Plz give me help of my project work in robotics field
        · 0 replies
      • Ranga Samy

        Hi i am a young mechanical engineer. Kindly clear my doubts. I am using Cold rolled sheet - 3mm for silicon sand breaking machine as a screen. It get wear and got holes across the screen. kindly suggest me the material or any kind of sheets within 3mm to 4mm thickness.
        The material normally used are silica sand in Foundry.
        · 0 replies
      • saialoknitish  »  Shalini Chakraborty

        Can we use motion sensors to stop the kneumatic devices, if yes then how. Pls guide me. 
        · 1 reply
      • Rakotondranosy Mamihaja

        Hi, I'am a young mechanical engineer, I need a help with PTC CREO software. If someone can send ful tutorial for this software. I don't find a full tutorial for this software in Google.
        · 0 replies
      • MD Shezan Mahmud  »  Henry Kurniadi

        hi henry ..your country?
        · 1 reply
      • Dattatray Shete

        Dear Sir,

        We are pleased to introduce ourselves as one of the leading Manufacturers &Regrinding of  Solid Carbide/HSS. Cutting Tools are catering to various customers. Here with we are enclosing our company profile indicating the details of facilities available with us to enable you to access our capability inline with your various requirements.

        We being the professional understand your problems better and can assure you the best quality with delivery commitment at a price that is competitive to the service rendered.

        We at N.D. TOOLS. await your valued query/order in the days ahead, to meet your valuable requirements and provide our valuable and prompt services all time.

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        Yours sincerely,

        For  N.D.TOOLS
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      • dapo_alabi

        I'm mechanically delighted 
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      • Hamza Arif

        1 ton refrigeration correspond to?
        · 0 replies
      • Engr Sunny Uduma

        Hi am Sunny uduma.happy to belong here...
        · 0 replies
      • Varun Singh Niki

        education is weapon to change the society and engineering is best tool fo do this..
        · 0 replies


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      • Mohsin Ali Saiyed  »  Mohamed Sami

        Hi I am Mohsin Ali 
        My job in toyota company 
        From Saudi Arabia 
        · 0 replies
      • Abdillah Mechanic Abdillah

        Hi my name is Abdillah am practical mechanic in Dar es salaam Tanzania.
        · 0 replies
      • Hilary Chilagorom

        We Mechanicals are truely the builders of the world believe it or leave it.
        · 2 replies
      • Sijo

        About engine;
                                 An engine or motor is a machine,designed to convert one form of energy into mechanical energy.Heat engine burn a fuel to create heat, which is then used to create a force. Electric motors convert electrical energy into mechanical motion; pneumatic motors use compressed air and clockwise motors in wind up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and eventually motion.
        (i). External combustion engine: In external combustion engine, the combustion of fuel takes place outside the engine. Example: steam engine.
        (ii). Internal combustion engine: In internal combustion engine, the combustion of fuel takes place inside the engine. Two stroke and four stroke petrol and diesel engine are the examples of internal combustion engine.
        1.The I.C. engines are classified on the following basis:
        (i). Reciprocating engine: In reciprocating engine, there is a piston and cylinder, the piston does reciprocating (to and Fro) motion within the cylinder. Due to the reciprocating motion of the piston, it is called reciprocating engine. 2 stroke and four stroke engines are the common examples of reciprocating engine.
        (ii). Rotary engine: In rotary engine, the rotor does rotary motion to produce power. There is no reciprocating motion. A rotor is present in the chamber which does rotary motion inside a chamber. Wankel rotary engine , turbine engines are the rotary types of engine. 2. Types of Fuel Used
        On the basis of types of fuel used, the engine is classified as petrol engine, diesel engine and gas engine.
        (i). Petrol engine: The engine which uses petrol for its working is called petrol engine.
        (ii). Diesel engine: The engine which uses diesel for its working is called diesel engine.
        (iii). Gas engine: An engine using gas fuel for the working is called gas engine.
        3.Cycle of Operation
        On the basis of cycle of operation the engine types are:
        (i). Otto cycle engine: These types of engine works on Otto cycle.
        (ii). Diesel cycle engine: The engine working on diesel cycle is called diesel cycle engine.
        (iii). Dual cycle engine or semi-diesel cycle engine: The engine that works on both diesel as well as Otto cycle is called dual cycle engine or semi diesel cycle engine.
        4.Number of Strokes
        On the basis of number of stroke, the types of engine are:
        (i). Four Stroke Engine: It is an engine in which the piston moves four times i.e.2 upward (form BDC to TDC) and 2 downward (from TDC to BDC) movement in one cycle of power stroke is called four stroke engines.
        (ii). Two Stroke Engine: The engine in which the piston does two times motion i.e. one from TDC to BDC and other from BDC to TDC to produce a power stroke is called two stroke engines.
        (iii). Hot spot ignition engine: This type of engine is not in practical use.
        5. Type of Ignition
        On the basis of ignition, the engines are classified as:
        (i). Spark ignition engine (S.I. engine): In spark ignition engine there is a spark plug which is fitted at the engine head. The spark plug produces spark after the compression of the fuel and ignites the air fuel mixture for the combustion. The petrol engines are spark ignition engine.
        (ii). Compression ignition engine (C.I. engine): In Compression ignition engine there is no spark plug at the cylinder head. The fuel is ignited by the heat of the compressed air. The diesel engines are compression ignition engine.
        6. Number of Cylinders
        On the basis of number of cylinders present in the engine, the types of engine are:
        (i). Single cylinder engine: An engine which consists of single cylinder is called single cylinder engine. Generally the single cylinder engines are used in motorcycles, scooter, etc.
        (ii). Double cylinder engine: The engine which consists of two cylinders is called double cylinder engine. 
        (iii). Multi cylinder engine: An engine which consists of more than two cylinders is called multi cylinder engine. The multi cylinder engine may have three, four, six, eight, twelve and sixteen cylinder.
        7. Arrangement of Cylinders
        On the basis of arrangement of cylinders the engines classification is:
        (i). Vertical engine: in vertical engines, the cylinders are arranged in vertical position as shown in the diagram.
        (ii). Horizontal engine: In horizontal engines, the cylinders are placed horizontal position as shown in the diagram given below.
        (iii). Radial engine:  The radial engine is reciprocating type internal combustion engine configuration in which the cylinders radiate outward from a central crankcase like the spokes of a wheel. When it is viewed from the front, it resembles a stylized star and is called a ‘star’ engine. Before the gas turbine engine is not become predominant, it is commonly used for aircraft engines.
        (iv). V-engine: In v types of engine, the cylinders are placed in two banks having some angle between them. The angle between the two banks is keep as small as possible to prevent vibration and balancing problem.
        (v). W type engine: In w type engines, the cylinders are arranged in three rows such that it forms W type arrangement. W type engine is made when 12 cylinder and 16 cylinder engines are produced.
        (vi). Opposed cylinder engine: In opposed cylinder engine, the cylinders are place opposite to each other. The piston and the connecting rod show identical movement. It is runs smoothly and has more balancing. The size of the opposed cylinder engine increase because of its arrangement.
        8. Valve Arrangement 
        According to the valve arrangement of the inlet and exhaust valve in various positions in the cylinder head or block, the automobile engines are classified into four categories. These arrangements are named as ‘L’, ‘I’, ‘F’ and ‘T’.  It is easy to remember the word ‘LIFT’ to recall the four valve arrangement.
        (i). L-head engine: In these types of engine, the inlet and exhaust valves are arranged side by side and operated by a single camshaft. The cylinder and combustion chamber forms and inverted L.
        (ii). I-head engine: In I-head engines, the inlet and exhaust valves are located in the cylinder head.  A single valve actuates all the valves. These types of engine are mostly used in automobiles.
        (iii). F-head engine: It is a combination of I-head and F-head engines. In this, one valve usually inlet valve is in the head and the exhaust valve lies in the cylinder block. Both the sets of valve are operated by the single camshaft.
        (iv). T-head engine: In T-head engines, the inlet valve located at one side and the exhaust valve on other side of the cylinder. Here two camshafts are required to operate, one for the inlet valve and other one is for the exhaust valve.
        9. Types of cooling
        On the basis of types of cooling, the engines are classified as:
        (i). Air cooled engines: In these engines, the air is used to cool the engines. In air cooled engines the cylinder barrels are separated and metal fins are used which provides radiating surface area that increase cooling. The air cooled engines are generally used in motorcycles and scooters.
        (ii). Water cooled engines: In water cooled engines, the water is used for the cooling of engine. Water cooled engines are used in cars, buses, trucks and other four wheeled vehicles, heavy duty motor vehicles. An anti-freezing agent is added in the water to prevent it from freezing during cold weather. Every water cooled engines has radiator for the cooling of hot water from the engine.
        Beside above types of engine, the internal combustion engine is also classified on the basis of the following.
        1. Speed: 
        On the basis of speed, the types of engines are:
        (i). Low speed engine
        (ii). Medium speed engine
        (iii). High speed engine
        2. Method of Fuel Injection
        On the basis of method of fuel injection the engines are classified as:
        (i). Carburetor engine
        (ii). Air injection engine
        (iii). Airless or solid injection engine
        3. Method of Governing
        (i). Hit and miss governed engine: It is an engine type in which the entry of the fuel is controlled by the governor. It controls the speed of the engine by cutting off the ignition and fuel supply of the engine at very high speed.
         (ii). Qualitatively governed engine
        (iii). Quantitatively governed engine
        4. Application
        (i). Stationary engine: Stationary engine is an engine in which its framework does not move. It is used to drive immobile equipment like pump, generator, mill or factory machinery etc.
        (ii). Automotive engine: These are the types of engines which are used in automobile industries. For example: petrol engine, diesel engine, gas engine are internal combustion engines falls in the category of automotive engine.
        (iii). Locomotive engine: The engines which are used in trains are called locomotive engines.
        (iv). Marine engine: The engines which are used in marines for boat or ship propulsion is called marine engine.
        (v). Aircraft engine: Types of engine which are used in aircraft is called aircraft engine. Radial and gas turbine engines are used in aircraft propulsion.

        · 1 reply
      • Evans Ezekiel

        Hello Great Mechanical Engineers, Greetings from Nigeria.
        · 0 replies
      • Mirza Asadullah Zahid

        Hy guys... I need a detailed description of steam turbine and water tube boiler. Can anyone help me. Kindly refrences with the images or share the link where i could read the article. Thank you ? ??
        · 0 replies