Abstract: An apparatus for planing opposite sides of a workpiece has a housing having a lower part and an upper part flanking a passage through which the workpiece to be planed is passed horizontally in a travel direction. Respective upper and lower planing drums rotatable on the respective housing parts above and below the passage about respective upper and lower axes extend transverse to the direction and define on rotation respective upper and lower cutting orbits centered on the respective axes. The lower drum is upstream of the upper drum relative to the workpiece travel direction. A stationary workpiece support table between the drums has an upper surface level and tangent with the lower orbit. Thus the underside of a workpiece passed in the direction over the lower drum is planed and slides downstream of the lower drum on the table surface.