The problem with most etched-line saw-blade indicators is that it’s too easy to make an incorrect reading if you’re not looking through the acrylic at just the right angle. And for those times when you’re cutting a dado or groove, the single line doesn’t indicate the exact location or full width of the blade. Kerfing the gauge as shown (I replaced mine with a scrap of clear acrylic) solves both problems in one quick cut.
To make the gauge,
affix the acrylic to the end of a scrap 2×4 with a few dabs of hot glue then notch it with your table saw for an exact blade-width kerf. Next, set the indicator by positioning the rip fence against the right side of the blade, and adjust the left-hand edge of the kerfed acrylic to your zero mark.
