Jignesh Shah

A  grinding wheel  is a wheel composed of an  abrasive  compound and used for various  grinding (abrasive cutting)  and  abrasive machining operations. Such wheels are used in  grinding machines . The wheels are generally made from a  composite material  consisting of coarse-particle aggregate pressed and bonded together by a cementing matrix (called the  bond  in grinding wheel terminology) to form a solid, circular shape. Various profiles and cross sections are available depending on the intended usage for the wheel. They may also be made from a solid steel or aluminium disc with particles bonded to the surface. Today most grinding wheels are artificial composites made with artificial aggregates, but the history of grinding wheels began with natural composite  stones , such as those used for  millstones . The manufacture of these wheels is a precise and tightly controlled process, due not only to the inherent safe...

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AJM machines are usually self-contained bench-top units. First it compresses the gas and then mixes it with the abrasive in a mixing chamber. The gas passes through a convergent-divergent  nozzle  before entering the mixing chamber, and then exits through a convergent nozzle. The nozzle can be hand held or mounted in a fixture for automatic operations. [2] [3] Nozzles must be highly resistant to abrasion and are typically made of  tungsten carbide  or  synthetic sapphire . For average material removal, tungsten carbide nozzles have a useful life of 12 to 30 hours, and sapphire nozzles last about 400 hours. The distance of the nozzle from the workpiece affects the size of the machined area and the rate of material removal.

    A   water cooler   or   water dispenser   is a   device   that   cools   and dispenses   water . They are generally broken up in two categories: bottleless and bottled water coolers. Bottleless water coolers are connected to a   water supply , while bottled water coolers require delivery (or self-pick-up) of water in large bottles from   vendors . Water cooler may also refer to a primitive device for keeping water cool.

Electrochemical machining  ( ECM ) is a method of removing metal by an  electrochemical  process. It is normally used for mass production and is used for working extremely hard materials or materials that are difficult to machine using conventional methods. [1]  Its use is limited to  electrically conductive  materials. ECM can cut small or odd-shaped angles, intricate contours or cavities in  hard  and exotic metals, such as  titanium aluminides ,  Inconel ,  Waspaloy , and high  nickel ,  cobalt , and  rhenium  alloys. [2]  Both external and internal geometries can be machined. ECM is often characterized as "reverse  electroplating ", in that it removes material instead of adding it. [2]  It is similar in concept to  electrical discharge machining  (EDM) in that a high current is passed between an electrode and the part, through an  electrolytic  material removal process havi...