Grinding Wheels - 2: Materials
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
There are two main material types for grinding wheels: Aluminum Oxide and Silicon Carbide.

Aluminum Oxide is used to grind materials such as hard steel, wrought iron and tough bronze. These materials are considered to have a high tensile strength. Depending on the purity factor, it can also be used to grind cast iron as well as stellite, which is used in dies and gages. Aluminum Oxide it the most common abrasive used in grinding wheels.

Silicon carbide grinding wheels are used to grind low tensile strength materials, such as aluminum, brass and softer bronzes. It is also used on most non-ferrous metals.

Other specialty materials are Cubic Boron Nitride, diamond, and gel ceramic abrasive.

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