Abstract: Mixer for molding sand and the like having a stationary smooth mixer bowl with a central tool located at the bottom thereof for imparting rotational movement to the sand being mixed in the bowl. Extending downwardly from above into the sand being mixed are a plurality of centrifugal tools located eccentrically with respect to the axis of the bowl. These centrifugal tools are rotated in a direction opposite the direction of rotation of the central tool. The radially extending vanes of the central tool are configured with respect to the plurality of centrifugal tools such that only one vane is in simultaneous facing relationship to any of the centrifugal tools during mixing operations. The centrifugal tools are rotated about axes extending obliquely with respect to the axis of rotation of the central tool so that the spacing of the centrifugal tools from the axis of the central tool is larger at the top than at the bottom.