Article: For perfectly straight lines, use a chalk line. Gran one end yourself and have a friend hold the other. Hold the line about 2 feet (0.61m) over the region to be cut. In one quick motion, raise the chalk line up about 1 foot (0.30m) and snap it down so that it hits the ground and applies chalk in a straight line. If you freehand your line with chalk, make sure to make it as thick as possible. For a 1-week chalk lifespan, use blue and white colors. Orange, green, and yellow last 2 to 3 weeks, while red and black last around 2 months. Fix a pair of vice grips to the side of the old blade to prevent it from spinning. Unscrew the center bolt in the middle of the blade with a wrench. Now, remove the small rim piece (called a flange) underneath and take the old blade out. Attach your diamond blade, taking care that the teeth point in the opposite direction as the cut. Finally, reattach the flange and bolt. Fix a pair of vice grips to the diamond blade if it's moving around while you're reattaching the bolt. If you're using a cut-off saw, you're probably cutting concrete between 4 to 6 inches (10 to 15cm) in depth. Loosen the blade lever to release it and adjust the base plate around the saw until the correct amount of saw is exposed. After the blade is at the right depth, place your index finger under the base plate to hold it in place and tighten the blade lever. To help you accurately adjust the depth, place the saw onto a long piece of wood as thick as the desired depth. Let the blade hang down over one side and use it as a guide. Angle the saw at a 45 degrees to the concrete and stand slightly to the left of the saw so that you're also facing the cutline at a 45-degree angle. Hold the backmost handle with your dominant hand and use it to move the saw forward and backward. Grip the frontmost handle with your non-dominant hand and use it to guide the blade along the chalk line. Proceed slowly, maintaining minimum RPMs of the cut-off saw. Face your dominant foot outward from the saw, perpendicular to the cutline. Keep your nondominant foot facing the cutline at a 45-degree angle. Cut for 30 to 45 seconds at a time and let the blade cool for an equal amount of time. Never apply water to electric cut-off saw blades.
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Mark the cutlines on your concrete using chalk lines or a piece of chalk. Attach a 14 inch (36cm) wet-cutting diamond blade to a cut-off saw. Adjust the blade depth of your cut-off saw. Cut along the chalklines at the lowest revolutions per minute (RPM) setting.