Quote Originally Posted by nun2sharp View Post
If you are going to use it at that high of an RPM, please be DAMN CAREFUL! Use light strokes, do not push the blade into the wheel. A simple solution to your dilemma is to install a dimmer switch to adjust the RPMs, once installed turn the dimmer switch to the halfway point and you will be where you need to be.
I'm not too sure that would work; I seem to remember reading something about grinder motors typically being of a type that can't use speed modifiers like those used for routers (dimmer switches would be the same type)...

EDIT: Quick google reports that grinders are "induction" motors, not "universal" motors...But I'm no expert in this particular field--I'm just reporting on what I've read.