Aargh! A ridge on the board! Something has nicked your thickness-planer or jointer knives. You have a few more pieces to plane, no spare knives, and the sharpening shop is closed for the weekend. Are you just out of luck?

You can still complete that project. Move one of the knives 116 " or so to one side, and carry on with the job. By offsetting the nicks in the knives, your stock comes out clean.
—Gary Miller, Peek, Minn.