While many other types of drill bit can be sharpened effectively using a bench grinder, the spurs on brad point bits are at risk of being damaged or ground off unless you customise your wheel first.
For this, you will need a static diamond wheel dresser. This tool is shaped like a cuboid mounted on a long handle. The cuboid part of the tool is coated in polycrystalline diamond (PCD), which is one of the few materials that can grind a grinding stone.
You will need to create a groove with one side ground at a 35 degree angle. This will form the shape of each spur.
Set the wheel dresser on your tool rest (the metal lip in front of the grinding wheel) and measure out a 35 degree angle from the narrow edge of the grinding wheel before activating it. It may help to make a mark on your tool rest so you can find the angle again without having to measure. Carefully slide the dresser forwards so that it makes contact with the wheel. It will begin to cut a notch into it.
Once the groove is around 10mm (just under 1/2″) in from the edge of the grinding wheel, deactivate it.
Your wheel is now ready to sharpen your brad point bits!
