Grinding

"Grinding is a type of abrasive machining process which uses grinding wheel as cutting tool.

A wide variety of machines are used for grinding, best classified as portable or staionary:

Portable power tools such as angle grinders, die grinders and cut-off saws

Stationary power tools such as bench grinders and cut-off saws

Stationary hydro- or hand-powered sharpening stones

Milling practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; yet in mass production contexts, it can also rough out large volumes of metal quite rapidly. It is usually better suited to the machining of very hard materials than is "regular" machining (that is, cutting larger chips with cutting tools such as tool bits or milling cutters), and until recent decades it was the only practical way to machine such materials as hardened steels. Compared to "regular" machining, it is usually better suited to taking very shallow cuts, such as reducing a shaft´s diameter by half a thousandth of an inch or 12.7 μm." - (en.wikipedia.org 27.01.2022)