We have an angle grinder in the workshop. This is used for making cuts in metals. This is to be only used within the weldy / grindy area, NOT the main metal work area, we have to avoid any particles entering into the lathe or milling machines.
There is a packet of spare discs in the box with the grinder, as well as the spanner for changing them. Remember that the discs wear with use - if you're doing a lot of cutting (or cutting through something very tough) and thus using a lot of discs, it would be polite to replace what you use