One of the most common ways to flatten a board in a planer is to glue sacrificial rails to the board and then rip off the rails once the planing work is done (see Jerry Lyons's method in FWW #208, p. 16). My approach eliminates those rails in favor of reusable 1/2-in. by 1/2-in. skid strips dry-fitted into grooves routed into one surface of the board.rnJoint the edges of the board and clamp it between two guide rails (I used aluminum channel, but you could use wood beams or steel angle iron) so that the two high opposite corners are near the top of the rails.
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