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Precision crosscuts and ripping with a circular saw are fairly simple tasks if you take your time, cut at low speed and use a guide.

This manual describes how to operate the circular saw to achieve straight crosscuts and rip cuts, together with instructions on how to make a jig for rip cuts. Cross Cut Woodworking options #1:

Cross Cut Woodworking with a Guide

cross cut woodworking 1

The claw or “speed” square is an excellent saw guide for cross-cuts on dimensional lumber.
Mark the cut line as usual.
Place the saw blade on the waste side of the line.
Balance the edge of the square over the straight edge of the timber.
Slide the square to the side of the saw and align the saw with it.
Keep your fingers out of the way of the blade! Remember that the saw blade will protrude through the bottom of the wood where you cannot see it.
Using a clamp to hold the square often gives better results, but at the expense of speed.
It is also possible to cut corners in this way, but it is essential to use a clamp for good results.
Cutting wide boards measuring 8, 10 or 12 inches? Standard squares are 7-inch squares, but 12-inch squares and squares with a folding foot are also available. Cross Cut Woodworking options #2:

Cross Cut Woodworking: Ripping

Cross Cut Woodworking With guide

Most saws have a slot on the base and a locking screw for the fence to be knocked down. This fence may not be included with the saw, but models designed for the saw can be purchased as accessories. Many options are available.

The basic fence is a ‘T’ shaped device where the long part fits into a slot on the saw leg and is held in place by a screw. The short part attaches to the edge of the wood, allowing straight and repeatable cuts.
For the fence to work properly, the outer edge of the material to be cut must be straight, as this is the reference surface that guides the saw.
Some fences have the option of adding a longer piece of material for greater accuracy.
Care must be taken to avoid the saw becoming bound due to the cut being deflected from the edge. The fence may press against the side of the blade and cause kickback. This is a problem especially when cutting wood with a pronounced texture and when pushing the saw too fast. Cross Cut Woodworking options #3:

Commercial Saw Guides for Cross Cut Woodworking

cross cut woodworking with commercial guides

Similar to cross-cutting with a square (Cross Cut Woodworking), you can attach a ruler such as a straightedge or a flat board to the workpiece to guide longer cuts.
Commercial guide systems are available that provide a fixing for the saw and a guide to keep the saw straight.
Guide saw systems include a special plunge saw and a guide rail on which the saw slides. This is the pinnacle of circular saw precision.