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Sawing Accuracy Dimensional tolerances of sawn boards, cutting straightness etc. depend very much on the stability of the bandsaw blade. Under normal conditions the distribution of a specific lumber thickness in a sawmill can be illustrated as in figure 1.
Distribution of lumber thickness in a mill for an average lumber thickness of 25mm (~1"). If everything is kept constant and the feed speed increased, the thickness tolerance of the sawn lumber will be wider. The situation is illustrated in figure 2, where the target sizes differ at the two different feed speeds to reach the same minimum allowable lumber thickness of 24-mm (.94in.)
Change of target size at increased feed speed The result is a waste of raw material and the cost is of course related to the cost of the raw material and the demand for accuracy to size from the market. One explanation for the wider deviation at increased feed speed is to be found in the design of the tooth geometry. |
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The Sharp Tool Co., Inc.
, 7 Bonazzoli Ave.
, Hudson, MA 01749 |
