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Improved doctoring of bow-saws.

, : Improved doctoring of bow-saws.. Lesnaya Prom, 5/6, 8-10

In comparative tests of cross-cutting with bow-saws, using a 'dynamograph' apparatus to record the actual work done, it was found that: (1) For saws with a medium-hard carbon-steel blade, the best results in cutting moist and half-dry timber were obtained when the teeth were filed to a honing angle of 35 degrees which reduced the work done (per sq. cm. of section cut by 17.5 per cent. compared with an angle of 45 degrees (2) The planing teeth in this type of saw should be lowered not less than 1-1.2 mm., the expenditure of work then being 15-30 per cent. less than with planing teeth lowered by 0.50-0.7 mm. As it appeared that the optimum had not been reached with reduction by 1.2 mm., the advantage of having any planing teeth in such saws is open to question, especially as they require more skilled filers for maintenance. (3) Reduction of the cutting teeth from 7 to about 5 mm. in height is recommended as giving 12 per cent. less work per unit of section cut, and this reduction is particularly desirable when hard and frozen timber is to be cut. (4) 11-14 per cent. less work is required if the cutting teeth are set for only half of their height instead of for their whole height. (5) Warping of the blade seriously affects sawing efficiency and proper hammering is essential.


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