When using a circular saw, cutting on the waste side of the cut mark allows for accounting for the kerf, which is the width of material removed by the blade.
Kerf is the part of the blade that needs to be accounted for when using a circular saw. The kerf represents the width of material that is removed by the blade when cutting, so cutting on the waste side of the cut mark ensures the final piece is the correct size. In the context of circular saws, knowing about the kerf is essential for making precise cuts.
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