Flatening wide boards with an"inadequate" jointer
Bill Tindall, E.Tn.
Cherry sap wood shrinks much more than heartwood. Boards with some of each assume amazing shapes when drying in a small stack that has little weight to mash it flat. The cherry I built the recent chest of drawers from is a case in point.
I have but an 8" jointer and frequently I am faced with 8+ wider lumber with twist. (Cup can be straightened directly with the planer, concave side down for early passes.) I have found that a scrub plane (simply a #5 with a severely cambered blade) and a flat surface is all that is needed to get an acceptably flat board. Caveat: I use an 18" Powermatic planer.
I place the twisted board on a flat surface and mark the diagonal high points. This surface goes up on my bench and I plane some off the marked "high" diagonal corners. The piece is returned to the flat surface to see if it still rocks on the high corners. If it does, plane some more from these corners. I am talking about crude planing with thick shavings. One minute to complete the planing. Repeat until the planed side sits on the flat surface (saw table for example) without rocking. At this point run it through the planer with this hand planed side down. When the power planed side becomes mostly cleaned up, flip and do the hand planed side. Alternate sides until the desired thickness is reached.
This procedure has worked for me many times, for example this top.


