Sam Murdoch said:
As always lots of good ideas already posted but here is one more tip. I have found this system useful in order to get multiple rips of the same dimensions. Set up 1 or 2 aluminum rules, preferably of the 2" wide x 1/8" thick x at least 3" long types with a pair of framing square clamps at your intended dimension. I use a clamp on each edge which ensures that my rule is truly perpendicular to the ply edge - no mini twist allowed. The clamps register against a previously straightened edge of the plywood (never go off factory) and the end of the rule to one end of the guide rail - which I always choose to clamp. Then move your rule to the other end & clamp there too. 2 rules properly set up are faster but one works fine. You can rip all day without ever needing to use your tape or your razor blades.
Yep, the method Sam has outlined is great to make multiple parts the same size. A slight variation is to set the rule or rules to a setting that is the width of the guide rail less than the desired width of the parts that you want to cut. That way your rule or rules can butt up against the backside of the guide rail and positioned square to the guide rail using framing squares. So, take a scrap piece of material that is at least a little wider than the width of the guide rail, align a clean edge even with the back edge of your guide rail and cut the piece -- now you have a setup piece that is the width of your guide rail. And as Sam says, you won't need to measure each cut with your tape or use any razor blades -- a much faster and more accurate method than using those razor blades.
