Bandsaw blade tilt
I believe blade tilt is the lean of the blade towards or away from the log bed. On my machine there should be no tilt or the blade should saw parallel to the log bed rails. If the blade leans down, it will cut too deep and cause wrong thickness lumber, and if it leans up, it will also make wrong thickness lumber. And either way, it will either ride up as it enters the cut or ride down, making lumber with thick or thin ends.
This tilt gauge came with the mill, when I got it from Wood-Mizer. You attach it on to the blade between teeth so the set of the teeth doesn't push on it. Then you measure from the front end of the gauge to the bed rail and then move the saw head forward and measure from the bed rail to the back end of the gauge.
In the photo below, the framing square is being used to measure from the bed rail to the gauge on the first bed rail. You can measure to the bottom of the gauge or the top - it doesn't matter as long as both are measured the same. The distances should be the same for a level cut. If the distances aren't the same, you need to adjust your guide blade roller bearing so that they are the same.
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