Angle grinder
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An angle grinder is a handheld power tool used for cutting, grinding and polishing.
Angle grinders can be powered by an electric motor, petrol engine or compressed air. The motor drives a geared head at a right-angle on which is mounted an abrasive disc that can be renewed when worn. Angle grinders typically have an adjustable guard and a side-handle for two-handed operation.
[edit] Uses
It can be used for removing excess material off a piece, and simply cutting in to a piece. There are myriad different kinds of disks that are used for various materials and tasks, such as cut-off disks (diamond blade), abrasive grinding disks, sanding disks, wire brush wheels and polishing pads. The angle grinder has large bearings to counter side forces generated during cutting, unlike a power drill, where the force is axial.
Angle grinders are widely used in metalworking and construction, as well as in emergency rescues. They are commonly found in workshops, service garages and auto body repair shops. There is a large variety of angle grinders to choose from when trying to find the right one for the job. The most important factors in choosing the right grinder are the disc size and how powerful the motor is. Other factors include power source (pneumatic or electric), rpm's, and arbor size. Generally disc size and power increase together. Disc size is usually measured in inches. Common disc sizes for angle grinders include 4, 4.5, 5, 6, and 7 inches. Discs for pneumatic grinders also come much smaller. Pneumatic grinders are generally used for lighter duty jobs where more precision is required. This is likely because pneumatic grinders can be small yet remain powerful, while it is harder for an electric grinder to maintain adequate power with smaller size. Electric grinders, are more commonly used for larger, heavy duty jobs. There are also small electric grinders and large pneumatic grinders.
Angle grinders, however, can be dangerous due to the high rpm involved and the sparks and bits of metal that fly off as they cut and grind. Another dangerous aspect of angle grinders is that a bad cutting disk can shred when in use. A third risk is that if the edge of the grinding wheel binds in a corner the torque from the spinning wheel will jerk the tool violently. These safety hazards can be mitigated. Proper safety equipment while using an angle grinder would include safety glasses, thick leather gloves, and in more heavy duty operations hearing protection and a face shield. While using an angle grinder can occasionally result in injury, use of proper protective gear will greatly reduce the risk.
The angle grinder can be contrasted with other varieties of grinders; see grinding machine, bench grinder and other diamond tools.
[edit] Invention
The Angle Grinder was invented in 1973 by Thomas Joseph. It was regarded as one of the best inventions for Engineer's worldwide.
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