The type of wheel on your grinder is important. Gray stones are too hard, so do not dissipate heat readily, burning your tools. White stones are very soft, keeping your tools from burning, however, they wear down very quickly. Blue stones are the Goldie Locks of grind stones for sharpening. They last a very long time, while still being soft enough to not burn your tools. CBN (cubic boronitrate) wheels are steel wheels with an impregnated abrasive.
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