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how to cut boards the same length with circular saw. Now that your blade is spinning you can begin to make the cut. Position your forefinger under the saw shoe and tight to the edge of the board and pinch the shoe of the saw between your thumb and forefinger.
While a nice table saw setup is beneficial for perfectly straight cuts on sheet goods its not 100 necessary. Crosscut blades made for cutting across the woodgrain across the face of a board have between 40 and 80 teeth and are designed for clean cuts. Check that the two 45-degree cuts line up to fit in a complementary way.
Perfect Cuts With a Circular Saw Guide.
In general the front is the side you push the saw in. Off set it based on the baseplate of your circular saw. Do this by setting the circular saw to an angle of 45 degrees and cutting each piece with a carpenters square and the saw set at a 45-degree angle. One method is to support the board with strips of wood as shown here.