Skill Saw Cutting Guide
Use this skillsaw cutting guide board to make straight cuts with a skillsaw, use an eight foot one for ripping sheets of plywood lengthwise and a four foot one for cutting across the sheet.
Using a straight board tack it to a strip of at least 1/2" thick plywood with a factory edge so that a 5" strip is cut off, then cut a second strip 10" wide in the same manner, this strip does not need a factory edge. Fasten the 5" wide strip on top of the 10" wide strip with the factory edge in the center of the 10" strip with glue and wood screws.
Position the base of your saw against the edge of "A" and cut through the entire length of "B".
To use the guide line the edge of the wide board "B" with marks on plywood to be ripped, fasten guide with clamps on outer edge of "A" so saw will pass by them, run saw along on top of "B" and against "A" to make cut.