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For sharpening, you will need a 6", 7", 8" or 10" inch bench grinder, an aluminum-oxide general-purpose grinding wheel, a silicon carbide green wheel and a single-point dresser.

1- Place the aluminum-oxide wheel on one side of the bench grinder and the green wheel on the other side.

2- Use the diamond tip of the single-point dresser to grind away about a 1/2-inch groove in the middle-front portion of the green wheel to accommodate the front radius of carbide tip.

3- Hold the blade vertical and inverted so that the carbide is facing up.  Do not grind the face of the carbide.

4- Use the aluminum-oxide wheel to grind away some of the steel from the front of the tip below the carbide, exposing the front of the carbide.

5- Do not allow the carbide's top-front cutting edge to touch the grinding wheel.  That would ruin the tip.

6- At the green wheel, carefully hold the blade vertical with the carbide facing up and gradually grind away the dulled portion of the carbide tip, maintaining a 30-degree front cutting angle.

Hold blade vertical and push toward the green wheel.  Do not lift the blade into the green wheel

Depending on the blade's dullness, you may need to go back and forth between the aluminum-oxide wheel and the green wheel until you have restored a sharp cutting edge.  As you become more familiar with sharpening, you will be able to do it quickly

By keeping your stump grinder sharp, you will keep your customers satisfied and take a lot of wear-and-tear off the machine