Hi everyone, semi-new here, I´m surfacing the bed on my home made cnc router, and after what feels like an eternity with a few steps to finish, has no got me in a mess. I´m surfacing (trying to) the bed of my cnc router but it´s really weird that both sides have high spots and the middles are flat. My objective here is using a 10 mm end mill with 90 overlap to check for any crookedness, but I just cant seem to understand how this could physically happen. Help please!