Grinding wheels are integral to grinding and polishing jobs. If you intend to have a superior finish for your grinding application, then you must choose your options wisely. Generally, grinding wheels have two components. The first one is meant for cutting and has abrasive grains whereas the second component has the glue which holds the abrasive grains together.
For grinding discs, flap wheel is used extensively along with other abrasives. Grinding wheels have varying levels of strength, resistance to impact and toughness. Some widely used abrasive materials used in grinding wheels are listed below:
a) Aluminium oxide: Aluminium oxide is used generally in the majority of grinding wheels including off-hand abrasives. They are mainly used in grinding carbon steel, wrought/malleable iron, alloy steel, and high-speed steel.
b) Zirconia Alumina: Zirconia alumina is a compound made up of Zirconium oxide and aluminium oxide. Grinding wheels made up of Zirconia alumina are durable yet sturdy and are best suited for grinding applications such as cut-off operations. They account for a minimal heat build-up when used for cutting stainless steel.
c) Silicon Carbide: For grinding brass, grilled iron, and bronze, grinding wheels’ silicon carbide abrasives can work effectively. They can be used in grinding non-ferrous materials such as rubber and stone.
d) Ceramic Aluminium Oxide: Grinding wheels with ceramic aluminium oxide coating are known for superior strength and used in applications where precision grinding is required.
If your job requires needs faster removal/grinding, coarser grit such as 36 or 40 is ideal. For smoothest finishes, a finer grade grit like 60, 80, or 120 is recommended.