A hole saw is not immediately recognizable as a saw. In fact, a hole saw could better be described as a boring tool to make holes in thin surfaces. For example, a hole saw is used to create the perfectly round hole through which your doorknob fits, or a round hole which your pipes pass through in a cupboard.
A hole saw fits onto the end of your drill and the drill bit creates a pilot hole by which to grasp the surface for the hole saw to drill through. It is circular and cylindrical in nature. On the end of the hole saw are the tiny teeth that, when sharp, will cut through surfaces like wood, particleboard, and some soft metals.
Once the teeth become dull they will look slightly more rounded and at this point will fail to cut through a surface and could even rip the material you are trying to cut. Sharpening a hole saw is a major challenge and precision job.
Step 1 - Use Universal Sharpener
Take hold of the hole saw and place it in the drill end of the vice grip of your sharpener. Initially, this part is detached and you have to secure it in the fitting. The drill end looks identical to a chuck grip on a regular drill. It also has a twisting head that can revolve to secure different length pieces.
Tighten the chuck grip with the key provided with your sharpener. Do not attempt to over-tighten the grip. You could end up damaging the bit that goes into the drill, so keep it firm but not too tight.
Step 2 - Set Up
Loosen the revolving head of the grip and place the hole saw so that the teeth are resting very gently on the sharpening blade. Secure the screw knob to secure the hole saw against the blade so it doesn’t move during the process.
Use the head angle changer to adjust until the teeth are placed correctly. The head angler is the long thin knob at the front of the machine.
Step 3 - Mark
Now, given you will be going in a complete circle, it is important that you remember where you started. Otherwise, you would be doing a double revolution and not even realize it. Use a sharpie or permanent marker to put a small dot or line on the hole saw, just about where the starting point is.
That way, when you come around you will know which point you began with.
Step 4 - Make Hose Adjustment
You should have a hose adjustment fitting that is attached to a shop-vac or other vacuum cleaner. If your machine has one, set the hole of the hose directly under the hole saw and the blade. This will catch any metal dust that flies off during sharpening.
Step 5 - Sharpen
Start the machine and press the hole saw against the sharpening blade. Hold for about three seconds and then pull it back, turn the hole saw to the next tooth and press forward again. Repeat this until you reached the point you marked. Turn the machine off and check your hole saw.