Many different tools can be used to cut stone, from chisels to expensive professional rock cutters. If you are working on a small rock, stone or masonry cutting project at home, you may not need to rent a rock cutting saw to finish the job. The simplest way to build a rock cutting saw is simply to convert an existing circular saw. With the right blade, a circular saw is capable of cutting even the strongest granite.
Purchase an abrasive blade for rock cutting, or a diamond-tipped circular saw blade from your local hardware store.
Push the blade lock button on the circular saw. This assists in changing the blade.
Locate the blade changing tool (the "key") that came with your circular saw. It looks like a small wrench.
Put the key on the bolt in the center of the blade. Twist to the left to unscrew the bolt completely.
Pull up the blade guard on the saw to expose the blade.
Lift the blade up off of the bolt and, and pull out. Do not lose the nut and washer that held the blade to the center bolt.
Place the diamond or abrasive blade in the saw and on the center bolt.
Put the nut and washer on over the new blade, turn right to twist tight.
Cutting stone will make the saw blade hot, so hose down the rock with water before cutting, and take a break when the saw starts getting hot.
Wear a mask when cutting rock, inhaling the dust can be hazardous to your health.