I bought a nice new whiteside 45 degree chamfer bit with a 1.5″ cutting length (https://www.whitesiderouterbits.com/…/products/2310) intending to cut 45 degree mitered corners on to some shelving. It cuts my 27/32″ oak beautifully, but unfortunately, while the height is fine (the cut goes all the way to the bottom of the 27/32″), I’m getting a slightly lip left at the top (i.e. the top of the router bit is below the top of the wood).

This confuses me, as a right triangle with hypotenuse of 1.5″ should have sides over 1″ (and thus enough for my 27/32″ boards). Am I missing something?

I can go and clean up the lip with some hand chisel work, but i’m sure it won’t be as clean as the nice routed side I have now.

Thoughts? Suggestions?