Assuming you are buying more than one sheet of plywood, you can put 2
sheets up on sawhorses, offset the long edge of the top sheet from the
bottom sheet an appropriate distance to use it as a fence for your
circular saw, clamp it, then rip off a strip a few inches wide from the
bottom sheet. Now you have an 8 foot straightedge.
Years ago I took a piece of red oak, jointed it flat on the edge and put a
piece of aluminum angle material on one edge. It has served me faithfully
for at least 30 years. Not only do I use it to draw lines, but I also clamp
it to 4 X 8 sheets of plywood for a saw guide.
It doesn't get as much use as it did, I now have a panel saw. I do wood
boat restorations and handle a lot of sheet goods.
if you are using more than 1 sheet of plywood lay one on top the other
and clamp it on your marks using the top sheet as the strait edge.
alow for the distance from the edge of the saw shoe to the blade when
making your marks. after you cut the first side for the book case use
it as a guide to cut the rest. for a book case the factory edge of the
plywood should be strait enough. works for me!
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