Learn how to make your own cutting guide for straight circular saw cuts.
There are two basic types of cuts to make using a circular saw: a crosscut, which runs across the grain, and a rip cut, which runs with the grain. No matter what type of cut you're making, for best results it should be straight.
The simple homemade cutting guide shown here helps you produce straight, accurate cuts with your circular saw. It is made from a piece of 1/4-inch plywood and a straight length of 1/2-inch stock. You can make the guide any length you like, up to 8 feet long for cutting sheets of plywood.