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In the good ole days before the time of fancy power miter and cutoff saws, when framing a house, we would use nothing but our trusty old circular saw—Skilsaw, we called them—for cutting and ripping our lumber. We used plywood, so I'm not that old. This was also the time before pre-cut studs came onto the market. In order to cut our studs quickly and accurately, we would make ourselves a jig or saw guide.
Basically it would consist of a 2x10 floor joist with 2x4's nailed along one side as a fence and a short 2x4 block opposite on the right hand end. Spanning the 2x4 and block was a piece of 3/8" or 1/2" plywood with a strip nailed to the left side of it to act as a guide for the saw base plate. We wedged the blade guard up, not a healthy thing to do, but safe as long as the saw was left on the guide. About a foot or so to the left of the guide we notched the fence about a foot in length to enable us to grab the stock and move it easily. This guide was designed to cut to length 2" stock (1 1/2") and under. We mainly used it for cutting the studs and cripples and duplicate more cuttings, such as window studs and header studs.
Here is a picture of a saw guide I made up quickly for those of you who don't have a cutoff or radial arm saw.
Start with a 2x10 or smaller, depending on the width you will be cutting, and nail the 2x4 on the top edge of the 2x10, flush with the bottom. Make sure if you are cutting 8' studs, use a 10' 2x10. Leave a little extra on the right hand side for cutting short pieces. The plywood is about 1 1/2" wider than the base of the saw to allow for a guide strip to be fastened on the left side of it. Place a screw through the guide, plywood and into the fence. A 2x4 the same width is nailed to the opposite side of the 2x10. Keep in mind here that the 2x4 stock you are cutting will slide under the plywood guide easily, so make sure that there is a clearance of at least 1/4". I allowed 1 3/4" from the top of the 2x10 to the top of the 2x4. Best to notch the 2x4 fence for the plywood to set down 1/4". For the block on the front side, just rip it down to 3 1/4" and nail it flush to the bottom of the 2x10. When the guide plywood is square with the fence, screw it down to the block as well as to the right hand side.
Wedge the guard up as shown and set the depth of cut to just scratch the surface of the 2x10. Cut through the 2x4 block and fence.
This picture shows the left side of the plywood with the guide strip fastened. Notice how the saw will sit on the outside of the 2x10 (at the front) so the stock piece to be cut can slide under the plywood easily.
Here is shown a stop block rather than using nails. Notice the bottom of the block is undercut with a 45 degree to allow sawdust to not interfere with the end of the piece to be cut. Clean this out regularly.
Set this up on a couple of sawhorses and away you go.
