Question

Machine design

I need introduction for bench grinder machine, in own words please

Answer 1

A bench grinder can be used to grind, cut or shape metal. You can use the machine to grind down sharp edges or smooth burrs off metal. A bench grinder is a type of grinding machine used to drive abrasive wheels. Depending on the bond and grade of the grinding wheel, it may be used for sharpening cutting tools such as tool bits, drill bits and chisels. Alternatively, it may be used to roughly shape metal prior to welding or fitting.

A TYPICAL BENCH GRINDER

SPECIFICATIONS Model Number ATBGU/G Nominal Voltage Power Consumpton No load speed Wheel size Weight 230Vclt 50Hz 280 Watts 2880 Rpm 150 x 25 x 12mm 10.2kg Eye Erield Ad ustable bal ree: Moun:ing holee Lbunting hcles On , Off sich

Wheels come with maximum RPM ratings printed on the label. The grinder's RPM must be equal or lower than the maximum operating speeds indicated on the wheel's tag.

The typical wheels on most bench grinders are vitreous-bond wheels. They work best to do their intended task, but they inherently have a risk of cracking. Grinding wheels designed for steel are not to be used for grinding softer metals, like aluminium. The soft metal gets lodged in the pores of the wheel and later expands with the heat of grinding.

Most bench grinders are of the dry type, in which no cutting fluid (coolant) is used at the grinding interface, but often the work piece is dunked into a pan or pot of water for cooling so as to keep it from getting hot enough to lose its temper, burn the operator's hand, or both. Such pots are often mounted just below the grinder for safe and easy reach. For medium-carbon or high-carbon work pieces that are already hardened and tempered (such as tool bits and drill bits), the dipping of the piece into the water must be frequent enough to avoid very high heat followed by substantial quenching.

Grinding is prohibited on the side of a typical (disk-shaped) bench grinder wheel, which is designed for grinding on the periphery only. Risk of wheel explosion otherwise threatens.

The wheel guards serve to intercept the fragments of an exploding wheel, keeping them from killing people or damaging surroundings.