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Impact Wrench

Impact wrenches are widely used in many industries, such as automotive repair, heavy equipment maintenance, product assembly (often called "pulse tools" and designed for precise torque output), major construction projects, and any other instance where a high torque output is needed.

Impact wrenches are available in every standard socket wrench drive size, from small 1/4" drive tools for small assembly and disassembly, up to 1/2 for larger square drives for major construction. Impact wrenches are one of the most commonly used air tools, and are found in virtually every mechanic's shop. Mainly for removing wheel nuts when changing tyres, But now we have a range of 18 volt rechargeable tools for removing wheel nuts, ranging from the 10.8 volt 3/8 drive ideal for Go-Karts and Motor bikes, the compact 18 volt 3/8 and 1/2 ideal for racing rally use as only 1.2 kg, then our 18 volt 200nm workshop nut remover for passage cars, to our most powerful 18 volt 650nm gun to remove nuts from commercial vehicles

In operation, a rotating mass (the hammer) is accelerated by the motor, storing energy, then suddenly connected to the output shaft (the anvil), creating a high-torque impact. The hammer mechanism is designed such that after delivering the impact, the hammer is again allowed to spin freely, and does not stay locked. With this design, the only reaction force applied to the body of the tool is the motor accelerating the hammer, and thus the operator feels very little torque, even though a very high peak torque is delivered to the socket. This is similar to a conventional hammer, where the user applies a small, constant force to swing the hammer, which generates a very large impulse when the hammer strikes an object. Because the hammer spins and has velocity before impacting the anvil, the hammer has momentum. Because it has momentum, it must have kinetic energy. Energy is not stored over time, but rather, energy is stored with velocity. This energy is absorbed by the bolt, nut, or screw in question, and since the collision is (theoretically) an elastic collision, most of the kinetic energy of the hammer is transferred to the bolt that is to be turned. This is contrasted with a regular drill that only applies a torque to the bolt. There is no hammer that reaches a set velocity before hitting an anvil; there is no extra energy to apply to a bolt. The hammer design requires a certain minimum torque before the hammer is allowed to spin separately from the anvil, causing the tool to stop hammering and instead smoothly drive the fastener if only low torque is needed, rapidly installing/removing the fastener.