Semitubular Boards . . . A New Sawing Method

Schelling & Company of Austria have developed a machine for cutting bisected logs into semitubular boards. The unit is now being manufactured under U.S. Patent Number 3,203,456. Basically, the machine consists of four hollow drums with saw teeth on the leading edge. The drums are open at both ends and bisected logs can be reduced to semitubular segments by being driven through the machine. Cylinder diameter increases front to back, and thickness is controlled by the diameters of the drums. The unit has a 50hp motor and can cut 900-1200 lineal feet of logs between sharpenings. Blades can be changed in seconds. The machine costs $12,000 FOB plant and will cut 600 feet of 7-inch log halves per hour. The semitubular sections are claimed to be useful in making corrugated roofs by edge gluing, or tubes for ducts, log cabins, or columns.

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