Converting sander/polisher to grinder

SouthArk370Z

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

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Darwins Child

Job done! Only took about three times longer than expected, so situation normal. Using the vac, the dust was not so bad, but some dust did make it into the garage. At the end I swept up as much as I practically could and then fired up our backpack blower to make the rest magically disappear into the air that our neighbors will be breathing tonight.

Now, using a wire cup similar to this one:
5 in. Knotted Wire Cup Brush | Princess Auto
I'd like to scrub down the portion of floor that I'm going to paint.

Because the max rpm for the brush is 6500, for this job I'll probably use the Hitachi at 3400 rpm. This is where a variable speed grinder would be idea.

The more I use a grinder the more I think back to jobs I've done in the past using a hack saw and file. Yikes! Those would have been so much easier with a grinder.