A die grinder is a handheld tool which turns a burr or mounted abrasive stone at high speed. It is usually pneumatic (powered by compressed air), although electric die grinders are also common. Pneumatics, Pressurized gas to affect mechanical motion Pneumatic power is used in Industry, where it is common to have factory units plumbed for Compressed The burr or stone is held in a collet and may be changed as required by the task at hand. A collet (ˈkɒlɨt is a holding device—specifically a subtype of chuck —that forms a Collar around the object to be held and exerts a strong clamping force on The rotational speed of a pneumatic die grinder is adjusted by a hand-operated throttle, which allows the operator to vary the volume of compressed air entering the tool. Die grinders are used to grind or cut away small amounts of metal from a workpiece. The name comes from their use in touching up hardened steel dies. A die is a specialized Tool used in Manufacturing industries to cut shape and form a wide variety of products and components
Safety
Most die grinder throttles feature a spring-loaded "kickstand" mechanism between the throttle lever and the body of the grinder, which prevents the throttle from opening (being pressed down towards the body of the grinder) without operator intervention. This prevents the die grinder from accidentally activating.
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