Reply To: Advice on grinders – slow/fast, wet/dry?
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A high speed dry grinder used with care is imho ok: cool the blade often with water, don’t apply much pressure.
If the blade shows tempering colours as the visible sign that the steel loses it’s hardness, it’s not the end of the world. Just grind that part more carefully down.
Here in Germany high speed dry grinders are much more common than (wet) low speed grinders and the second hand market is full of such grinders for a few Euros. I wouldn’t go below 150mm (6″) disc diameter, because the smaller discs are, the more distinct hollow the disc creates.
But don’t underestimate the stubbornness of the grinding dust to prowl around and occupy every surface which isn’t vertically. Put blankets over the workbench, wood, tools and so on. When I have to use the power grinder, I put it on the foldable Workmate-like worktable and work outside.
Hope that helps,
E.