A handheld grinder would not be my choice for work that requires any precision. They work well enough for rough work but are hard to control. Great for removing a lot of metal but they also tend to generate a lot more heat than, say, a bandsaw - this can cause Aluminum to oxidize and steel to lose it's temper if you are not very careful.
That said, you can:
Use it as a chop-off saw for pipe, tubing, angle iron, &c
With a wire wheel/cup, remove paint/rust in a hurry
Deburr cuts made with saw a lot faster than using a file
Last edited by SouthArk370Z; 06-24-2016 at 04:09 PM.
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