This is the product of a quick but obsessive project in materials focused on making a precise, perfectly square frame. Normally this wouldn’t be a significant undertaking, but the extremely out-of-whack miter saw in the ITP wood shop demands a lot of fuss before it will give reliable 45° cuts.
The frame generally aligned well, but not completely perfectly. I substituted a bar clamp for the usual screw + wing nut combination in the frame clamp due to clearance issues.
The miter saw was about half a degree off, which I compensated for using the following technique:
