I can't add much to what Steve M said
Except to agree with him about putting a radius on the edge of you grinding wheel, you don't want to do that. If you want your plunge cut to be radiused hang the belt about an 1/8 inch off the edge of the wheel by adjusting your belt off center with your belt alignment knob or screw and use a flex belt. My grinders have a screw on one and a knob on the other to adjust my belts.
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