Turn off the power switch and unplug the bench grinder power cord. Lift the eye shields up if your grinder has them. Eye shields are clear plastic flip-down plates in front of the grinder wheel.
Remove the screws securing the disc cover to the side of the grinder with a Phillips-head screwdriver, if your grinder has covers. Pull the disc cover away from the grinder.
Insert a scrap piece of wood between the tool rest and the front of the grinding disc to prevent the disc from turning while removing. The tool rest is the raised metal plate where you place the item you are grinding during normal operation.
Loosen the nut securing the disc to the grinder with a socket wrench. If you are removing a right-side mounted disc, turn the nut counterclockwise. If removing a left-hand mounted disc, turn the nut clockwise. Remove the nut and the washer off the grinder shaft.
Slide the old grinding disc off the grinder shaft. Place a new grinding disc onto the shaft ensuring that the side closest to the grinder is flush against the inner spacer washer. Slide the outer washer over the shaft and against the outside face of the grinding disc.
Thread the securing washer over the shaft and tighten with the socket wrench. Place the piece of scrap wood between the disc and tool rest to prevent the disc from turning while tightening.
Unplug the grinder power cord from the wall outlet. Locate the spindle lock button on your grinder. The lock button is usually on top of the head or on the side. Press and hold the spindle lock button and turn the grinder over so the disc is facing you.
Remove the nut securing the disc to the grinder with a socket wrench. Some portable grinders use a special lock nut with holes and supply a special wrench. Remove the nut with the wrench supplied with the grinder.
Pull the washer off the grinder spindle and remove the old disc. Slide a new disc over the spindle and place the washer over the spindle and flush against the disc.
Thread the lock nut over the spindle and tighten with a socket wrench or the supplied wrench. Release the spindle lock.
Things You Will Need
- Scrap piece of wood
- Socket wrench
- Replacement grinding disc
- Use the appropriate size disc for your grinder. Refer to the owner's manual.