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Kerf Clearance between the bandsaw blade and the sawn surfaces is necessary in order to eliminate friction. This clearance is achieved by swaging the tooth tips. Wider swage is necessary for softwood than hardwood. Teeth are normally deep-swaged for softwood sawing but tip-swaged for hardwood. Some rule-of-thumb figures on the necessary amount of clearance are given in the figure below. It is obvious that the gullet will spill sawdust to some extent no matter how the calculations are made. The clearance given by the swage will allow for that. Increasing the swage is one way of utilizing faster feed. This method will allow the gullet to spill more sawdust without affecting the accuracy of the cut. It is a common way of sawing softwood at high feed speeds in North America. However, the recovery figures will be reduced due to the increased kerf loss. The economic results of course very much depend on the cost of the raw material.
Clearance given by the swage |
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The Sharp Tool Co., Inc.
, 7 Bonazzoli Ave.
, Hudson, MA 01749 |
