In Episode # 28, I showed how to match plane two boards to make a panel. In that episode, I left one face of each board rough, planed one face flat, and then match planed the glue edges to make a flat panel. This works well, but sometimes, after you start planing the still rough side of the glued up panel, you might get some movement. This usually isn’t a big deal if you realize it before you plane the rough side to final thickness. But if you don’t realize it before then, you end up having to either plane the panel even thinner than you planned, or, clamp the cupping out of the panel before you do any joinery.
There is a way to minimize the chances of this happening though. It requires a little more time in the prep stages, but it can be worth it if it makes the joinery go smoother. It’s called skip planing, and I plan to use the method on the rest of the boards for the remaining cases. Basically, you do a real quick and dirty planing of both sides of the board, just to remove the major cupping. Then you set the boards aside for 24 to 48 hours to get any last little bit of movement out of their system. Then you can come back, flatten the reference face, and then either move on to your match planing or gauge your thickness, and plane the board to finished thickness. Doing the skip planing first can save you a lot of work trying to re-flatten a larger panel later.