How to Sharpen Circular Saw Blades with a Mill File How to Sharpen Circular Saw Blades with a Mill File
If you want to sharpen your circular saw blades, then you may want to use a mill file. This file, also known as a mill bastard file, is a flat-bladed file with a tapered end. You can use this to sharpen the circular saw blades manually, rather than using a diamond power file to do the job for you.
Step 1 - Remove the Saw Blade
Take the circular saw blade out of the saw, by unscrewing the bolts which hold it in place. You then need to either secure it to a professional saw sharpener vise, or just use your everyday wood vise. Make sure that you hold the blade securely, but not too tight. Place a small mark on the side of the blade, so you know when you have completed the sharpening.
Step 2 - Use the Mill File
Take the mill file, and press it into the edge of the first tooth. Rub the mill file up and down the edge of the blade, ensuring that you keep the blade in contact with the blade at all times. Repeat this for one turn of the blade, and then turn over the circular saw blade, and repeat the process for the other side.