Install the diamond blade on your saw. Tip the wet saw on its side and unscrew the nut holding the blade in place. Lift the current saw blade out from the machine carefully so you don’t cut your hand. Insert your diamond blade so the teeth face in the cutting direction before securing it in place with the nut again. Use a socket wrench to tighten the nut completely.

How you change the saw blade and the direction it spins depends on the model of wet saw that you have. Consult the instruction manual to learn how to properly install the blade. Tip: Some saws come with a blade wrench you can use to tighten the nut. If your saw doesn’t have one, a ratchet wrench will work.

Fill the reservoir on the bottom of the machine with cold, clean water. Water in a wet saw helps cool down the blade and reduces the amount of dust. Locate the tray on the bottom of your wet saw for the water reservoir. Fill the reservoir with water until the bottom of the blade is slightly submerged.

Wet saws kick up water while you use them, so you may need to refill the reservoir if you plan on cutting multiple spots tiles. Since you’re working electronics and water, plug the saw into a GFCI outlet. GFCI outlets will automatically turn off the power if any of the electronic components in your saw get wet.

Adjust the fence on the saw to keep your cut straight. The fence is the straightedge piece that attaches to the base of your wet saw. Hold the marble tile that you’re cutting against the edge of the fence to see where it lines up with your saw. Adjust the fence closer or further from the blade until your mark lines up with the saw. Saw blades usually cut out 1⁄8 inch (0.32 cm) from your material, so make sure your blade is on the scrap side of your line.