How wide is your plywood? What you can do is take a 1x3 and screw it down to one edge of plywood then take the saw and lay the base plate to the edge of the 1x3 turn on your saw and cut the bad edge off and then you have you cut off jig if it is really wide enough put the 1x3 inboard from edge and do the same that way with the edge that is not cut off you can use that for clamping your jig to whatever u plan on cutting
Shop made circular-saw rip-cutting guide/jig:
Base 1/4'' hardboard---10-12'' wide
Guide 1/4'' hardboard x 4'' wide---(width to minimize warping and facilitate clamping)
Guide needs one edge with a straight cut along the saw base.
Guide clamped and glued to base.
Alternate guide: 1/2'' plywood---
screwed from underside, using flat head screws---
Make 1 for cutting 8ft sheet goods and another 4ft long for cutting shorter pieces.
.The question was how to make a ripping guide for circular saw .So to do it correctly you need to rip it with accordance to width of base plate of saw. You dont do that on a tablesaw without measuring from your fence to saw blade ,so just screw a board on your plywood and make your cut and it is all done with .hope his clears matters up
Yes, is the simple answer. Attach your straight 1x3 to the crooked plywood insuring that the distance from the 1x3 to the edge of the plywood is greater than your circ saw width (distance from base edge to blade). That way when you make the first cut your saw will be guided by the 1x3 and trim the plywood straight. after that you can use it as a rip guide, just align the edge of the plywood to your layout line, clamp in place and saw away. This helps prevent chipout as well, but it's still a good idea to cover the cut in masking tape first if you want a clean cut.
Personally, I've found a 4'' wide birch plywood guide to be less likely to distort.
6" wide stock is even better.
Store ''FLAT'', (horizontal), when not in use.
Plywood or hardboard makes a much better base because it is stable. A 1x12 is very likley to bow or warp over time, leaving your saw guide inaccurate.