Recent Developments in Circular Rip Sawing

In the 40 years prior to 1965 there were few changes in sawmilling and any changes in sawing equipment concerned greater production rates or reduced operating and maintenance costs. Since 1965 developments by Thrasher, Weyerhaeuser Co. and others have shown that great improvements in sawing quality are practical. Saw guides and their beneficial relation to the sawing problems of vibration, heating, tensioning, and saw filing are discussed. It has been estimated that for 2 by 4’s kerf reductions from 11/32 inch to 1/10 inch are practical, inaccuracies of ? 1/8 inch can be reduced to ? 1/32 inch, and surface roughness can be decreased from over 0.030 inch to 0.010 inch. Such savings represent greater than 50 percent reduction in sawing losses. If the 50 percent reduction were carried throughout the sawmilling industry the annual saving in Canada would be $16 million, and in the U.S. $60 million. Specific cases of sawing improvements in operating mills are cited.

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