Definition of Straightness of a Line in Two Planes A line is said to be straight over a given length, if the variation of the distance of its from two planes perpendicular to each other and parallel to the general direction of the line remains within the specified tolerance limits. The tolerance on the straightness
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The methods used for measuring the surface finish are classified into Inspection by comparison Direct Instrument Measurements Inspection by comparison methods In these methods of measuring, the surface texture is assessed by observation of the surface. The surface to be tested is compared with known value of roughness specimen and finished by similar machining process.
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To find out the accuracy of a screw thread, it will be necessary to measure the following: Major diameter Minor diameter Effective or Pitch diameter Pitch Thread angle and form Measurement of major diameter The instruments which are used to find the major diameter are Ordinary micrometer Bench micrometer. Ordinary micrometer: The ordinary micrometer is
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Form measurement includes screw threads measurement, gear measurement, radius measurement, surface finish measurement, straightness measurement, flatness and roundness measurements. Introduction Measurement of Screw Threads Measurement of screw threads are used to transmit power and motion and also used to fasten two components with the help of nuts, bolts and studs. There is a large variety
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A method of maintaining the speed of the turbine is constant irrespective of variation of the load on the turbine known as governing of turbine. The governors regulate the rate of flow to the turbine in such a way that the speed of the turbine is maintained constant as far as possible under varying load
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Rotational speed of the turbine Specific speed Maximum efficiency Part load efficiency Head Type of water Runaway speed Cavitation Number of turbine units Overall cost. Rotational speed of the turbine Turbines are used to produce mechanical energy which is again converted into electrical energy by coupling the generator through the shaft. Here, the speed of
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The pelton wheel is a tangential flow impulse turbine and now in common use. Leston A Pelton, an American engineer during 1880, developed this turbine. Fig shows the schematic arrangement of a pelton wheel. Pelton wheel consists of the following main parts. Penstock Spear and nozzle Runner with buckets Brake nozzle Outer casing Governing mechanism
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In cooling towers, the warm water is discharged from the condenser and fed the cooled water back to the condenser. The rate of evaporation of water in cooling tower and subsequent reduction in water temperature depend upon the following parameters. The exposive time. Amount of water surface exposed. Relative humidity of air. Velocity of air
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Electrodes: Generally two types of electroslag welding that are solid and metal cored are used. Though solid electrodes are more popular than the metal cored electrodes. Flux: Flux is the most important consumable material of Electroslag Welding. In its molten state it transforms the electrical energy into heat energy which helps in melting the electrode
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In this part we discuss mobile robots, a class of robots that are able to move through the environment. The figures show an assortment of mobile robots that can move over the ground, over the water, through the air, or through the water. This highlights the diversity of what is referred to as the robotic
What is a Mobile Robots? – Pedagogy Zone Read More »