When you install a new grinding wheel on a bench grinder or encounter a heavily used wheel, the wheel will vibrate and have an uneven grinding face. Truing the face of a bench grinding wheel requires a grinding wheel dressing stick. A dressing stick has a harder composition than the grinding wheel. When you apply a dressing stick to the grinding wheel, the grinding wheel wears down. This exposes a fresh grinding surface and squares the face of the wheel.
Twist the chuck of a dressing stick holder counterclockwise to open the jaws of the tool. Slide a grinding wheel dressing stick into the open jaws. Turn the chuck clockwise to lock the dressing stick in the stick holder.
Turn on a bench grinder. Allow the grinding wheels to reach operating speed.
Set the dressing stick holder on the bottom guide of the bench grinder. Align the tip of the dressing stick with the left side of the grinding wheel.
Push the tip of the dressing stick firmly against the spinning wheel. Move the dressing stick -- at a steady pace -- toward the right side of the grinding wheel. Move back to the left side of the grinding wheel maintaining steady pressure. Turn off the bench grinder. Allow the grinding wheels to stop spinning.
Place the blade of a combination square against the front edge of the grinding wheel. Repeat the dressing procedure until the square rests flat against the face of the grinding wheel.
Wear safety glasses to avoid eye injury when using a grinding wheel dressing stick.