Flatten Boards without a Jointer
A sled lets you use just your planer to mill lumber to any thickness
Working with wide lumber would be a joy if not for the dilemma of how to flatten the boards. The obvious method is to rip a wide board into narrower strips, use a 6-in. or 8-in. jointer, and then rejoin the parts. Finding this unsatisfactory, woodworker Keith Rust designed an adjustable sled that lets him mill wide boards with a thickness planer. The body of the sled uses a torsion-box design, which keeps it rigid and flat without adding too much weight. The board to be flattened rests on a series of adjustable supports. Now Rust is flattening 12-in. boards and loving it.
From Fine Woodworking #175
Click here to watch a video of the planer jig in action.