. Canadian forest industries 1909. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. will drag it out of the cut. Teeth can be spaced much closer together for soft-grained woods than for hard, close-grained woods, because in soft woods the dust breaks out in large particles, while in close-grained woods it breaks out in the form of a very fine powder. Sufficient room should always be provided in the gullet of the tooth to "chamber" the dust properly. There are two ways of providing this space. One is to space the teeth farther apart. The oth
. Canadian forest industries 1909. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. will drag it out of the cut. Teeth can be spaced much closer together for soft-grained woods than for hard, close-grained woods, because in soft woods the dust breaks out in large particles, while in close-grained woods it breaks out in the form of a very fine powder. Sufficient room should always be provided in the gullet of the tooth to "chamber" the dust properly. There are two ways of providing this space. One is to space the teeth farther apart. The other is to reduce the amount of metal in the tooth, thus increasing the size of the gullet. The correct form and spacing of teeth depend upon the nice balancing of these two conditions. Where various woods are to be cut it is often necessary to strike an average. Experience has proved that teeth spaced from one and one-half to one iand three-fourths inches apart give the best results on various kinds of woods. Ordinarily it is best fo carry as much "hook-" as possible without. decreasing the strength of the tooth. The greater the "hook" the more easily the saw cuts, but on cross-grained and hardwoods it should not be exaggerated or the tooth will have a tendency to bend sidewise and follow the grain. A saw tooth should contain as much metal as possible, but there are two conditions which limit the amount. One is that there must always be sufficient gullet provided; the other in cutting such woods as southern pine, and fir, that are very rich in pitch, the tooth should have as little metal as possible and still have the required strength, for the reason that there is less surface to which the pitch can adhere. We show forms of teeth which are recommended for different kinds of wood, but many variations may be made to suit special conditions. The forms shown are for 19-gauge saws. If thicker saws are used, the teeth can be slightly deeper 'and not quite as deep
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