Portable Circular Saw Straightedge
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your portable Circular Saw and this shop-built straightedge
when you're alone and need to safely cut full sheets of plywood,
MDF, hardboard or particleboard.
with a 2" wide x 4' long piece of 3/4" plywood...with at least
one straight-cut edge.
rip a piece of 1/2" thick x 4' long plywood that is exactly
2" wider than the distance between the outer edge of your
widest Circular Saw blade tooth and the right-hand (or outer)
edge of your Saw's "shoe" or baseplate.
the 2" x 3/4" strip to the top surface of the 1/2" thick piece
with finishing nails (or screws) and glue...so the outer edges
of both plywood strips are perfectly flush.
use the guide, clamp it to the top of the plywood or sheet
goods you plan to cut, with the edge of the 1/2" plywood lined-up
with your intended cut line.
on your Circular Saw and guide the inner edge of its
"shoe" against the straight edge of the 3/4" x 2" guide strip
as you move through your cut.
you often make rip cuts on full sheets of material, you might
also want to make a second Guide that's 8' long.