. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. er SAW-GRINDING. The following suggestions contributed by Mr. Powis Bale, , to the Timber Trades Journal, are presumed to represent the latest English practice : For many years after the introduction of emery wheels or disks a prejudice existed against their use for sharpening saws ; and, to some extent, this prejudice still survives. It arose chiefly from the fact that many of the wheels made were unsuited to their work, and the user had little knowledge as
. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. er SAW-GRINDING. The following suggestions contributed by Mr. Powis Bale, , to the Timber Trades Journal, are presumed to represent the latest English practice : For many years after the introduction of emery wheels or disks a prejudice existed against their use for sharpening saws ; and, to some extent, this prejudice still survives. It arose chiefly from the fact that many of the wheels made were unsuited to their work, and the user had little knowledge as to the proper management. In the following paper some hints will be given as to their management, which may be found ser- viceable to users ; and although these remarks relate chiefly to emery wheels for sharpening saws, they can, in most cases, be equally well applied to emery wheels used for other purposes. In the first place, it is important to secure an emery wheel of good quality and of a texture and hardness well suited to the work. This is not so simple a matter as it may at first appear, ow- ing to the quantity of cheap, inferior wheels with which the market is flooded. For saw-sharpening purposes a moderately soft wheel should be preferred, since it will cut quicker and heat and glaze less than a hard one ; it will, however, wear out a little sooner. Some wheels are harder on their surface than further in, and they do not cut their best until they are worn a little ; but the best class of wheels may be obtained of any required degree of hardness, as it is only necessary to vary the proportions of the compound used in their manufacture. Some- times a good wheel will be condemned as bad when the fault may arise from its being unsuited to the work it is used for, or it may have been run at an improper speed. In establishments where a variety of work is done it will pay well to have a fair assortment of wheels, and not make one do duty for all kinds of operations. When the
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