Magnetic straightedge lines up tricky crosscuts

A miter gauge works great for cutting an angle measured in degrees, but what about when only a marked line represents the angle? Aligning the cut by eye gets you close, but to find the angle precisely, try this straightedge.

To build one, drill counterbores for two rare-earth magnets (#37554, 800-279-4441, rockler.com) in a straight piece of scrap and epoxy them in place, leaving them a hair proud. Mount the straightedge onto the tablesaw's blade, flush with the blade's teeth. Then adjust the miter gauge until the cutline and the straightedge's inside edge align.
—Charles Mak, Calgary, Alta.