Don’t trust your planer’s thickness indicator? For perfectly thicknessed stock, make this reference gauge.

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Don't trust your planer's thickness indicator? For perfectly thicknessed stock, make this reference gauge. To ensure precision, cut the dadoes with straight router bits ranging from 18 " to 34 "; then label them with a fine-tip marker.

After each pass on the planer, check your stock for fit in the appropriate dado. When the planed piece slides in, your thickness is perfect.
—Keith James, Reno, Nev.