Nice jig. Setting the correct and exact angle on the table saw takes some practice. By the way my favorite table saw blade is the Freud LU87R009 9-Inch 22 Tooth ATB Thin Kerf Ripping Saw Blade with PermaShield Coating. I cut a lot of hardwoods (mahogany, oak and a very hard birch) and this blade does a superior job in ripping with no burn marks and still produces a glass-like cross cut finish. The 9" model has a very thin kerf and is pretensioned for truer cuts under heavy loads. I use it for all types of cuts. Thanks for the video.
This is very similar to the technique that machinists use to test the squareness of cylinder squares and machinists' squares.
A steel base with a protruding foot (analogous to the screws) has a vertical beam that carries a DTI (Dial Test Indicator). On a granite surface plate the foot is pressed against the cylinder square and the DTI reading noted. Then this action is repeated on other points around the square circumference. Adjustments are made until all readings coincide. Note that the beam need not be precisely orthogonal to the base; it only has to be rigid so the point of the DTI remains the same distance from the foot.
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