Abstract: A method and apparatus for improved centering of a workpiece in a surfacing machine includes centering assembly having a plurality of individually movable biasing element sets, comprising an upper element and a lower element. Each element set is operatively connected to a closed circuit, double rod end hydraulic cylinder assembly which selectively and independently positions the element set responsive to the surface to the workpiece. The hydraulic cylinder assembly includes a valve. A pressure device is also operatively connected to each element set to provide a centering force. In use, as the upper or lower element of an element set is forced away from the centerline of the workpiece, the opposing element would automatically move the same amount when the valve is closed. When the valve is open, the upper and lower elements are free to move independently, allowing the centerline to be easily positioned as desired.

Abstract: A method and apparatus for improved centering of a workpiece in a planer machine includes centering sectional shoe assembly positioned in close proximity to opposed cutting heads, between the cutting heads and a centering feed assembly. The shoe assembly includes a plurality of individually movable pressure shoe sets, comprising an upper shoe and a lower shoe. Each shoe set is operatively connected to a closed circuit, double rod end hydraulic cylinder assembly which selectively and independently positions the shoe set responsive to the surface to the workpiece. A pressure device is also operatively connected to each shoe set to provide a centering force. In use, as the upper or lower shoe of a shoe set is forced away from the centerline of the workpiece, the opposing shoe would automatically move the same amount. The shoe assembly thus centers each and every workpiece independent of the amount of stock removal required.