In this interview
on Jimmy’s YouTube
channel, interviewer Adam Price asks Jimmy a bunch of questions about his process, from designing, to materials, to fastening and gluing, to hardware.
In the above drawing, Jimmy is showing how you can “true” an edge of a piece of rough-cut lumber. If you have a surface planer and a table saw, you can save money by buying rough-cut, he says. It’s cheaper because it comes unplaned, but it has no true (or “factory”) edge. After planing it down, you can add a true edge. You nail the rough-cut lumber to a piece of wood that does have a factory edge and feed the rough-cut through your table saw. In the above sketch, that’s the table saw’s fence on the far right, a piece of plywood with a factory edge against the fence, and the rough-cut lumber nailed to the plywood. That little hump upper-left is the saw blade. When done (and de-nailed) that resulting cut becomes your true edge. See this part of the video starting at 15:22.