. Canadian forest industries 1910. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 26 CANADA LUMBERMAN AND WOODWORKER Preventing Breaks in Band Resaws Some Practical Pointers on Avoiding Accidents âLessons from ExperienceâBy J. W. Irwin I have been handling band resaws for one firm about four years with the machine running constantly ten months in the year, and during this four vears I have had onlv three cracks in the saws, two from acci- dents, one being in the centre of the braze. The first two were caused by the saw jumping off the wheels; by a
. Canadian forest industries 1910. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. 26 CANADA LUMBERMAN AND WOODWORKER Preventing Breaks in Band Resaws Some Practical Pointers on Avoiding Accidents âLessons from ExperienceâBy J. W. Irwin I have been handling band resaws for one firm about four years with the machine running constantly ten months in the year, and during this four vears I have had onlv three cracks in the saws, two from acci- dents, one being in the centre of the braze. The first two were caused by the saw jumping off the wheels; by a sliver jamming and making it very hot on the tooth edge and the lower wheel rubbing hard against the back of the saw, case-hardening it. The cracks commenced at these spots, and the one. at the braze I can hardly account for unless the tension had got wrong, as it commenced at- the middle of the braze at the centre of the blade. Previous to my coming to this firm they were quite discouraged with their resaws cracking and breaking and could scarcely get anything done. Well you might ask, how do you manage to keep your saws from crack- ing, as so many band saw filers have all kinds of trouble with their saws cracking and breaking and heating. First: I keep the saws well swaged and shaped with the shaper, and "round with the automatic saw sharpener. Never file resaws with files,°as the least cut with the corner of the file in the blade of the saw will start a crack. Second: I keep the saw properly tensioned up to the curved gauge with a hammer or rule, properly levelled, and on the back of the saw 1 carry about 1-32 of an inch on a five-foot straightedge. Then, the saw being in a good condition, I put it on the machine, tighten the saw and take°a short true straightedge or square (I use the latter myself and find it the best), open up the rules, place the straightedge against the two stationary rules, then draw in the rules till the straightedge comes quite close to t
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