Shop-made circ-saw guide can't stray
While I don't care for wrestling sheet goods atop my tablesaw to cut them, I dislike even more the hassle that comes with setting up most circular–saw guides: all that measuring, offsetting, and praying it comes out right. So I built this simple tracked guide that puts the blade in line with the cutline every time. To build one, cut a piece of MDF wider than your saw's base and as long as you'll need to span your sheet goods. Then, cut a 3⁄4 "-wide groove 3⁄8 "-deep the length of the MDF. Mount a 3⁄4 "-wide hardwood runner to your saw base (to match the groove in the MDF) and wax it with paraffin. Place the runner in the groove, turn the saw on and cut the full length of the MDF. Now, simply align the edge of the guide with any cutline, clamp it in place, and run the saw in the groove for an accurate cut.
—Lonnie Holbrook, Kannapolis, N.C.