Manual Training for Common Schools; An Organized Course in Wood-Working (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...138--The Set of the Saw Teeth Makes the Kerf Wider than the Blade Filing the Saw All saws are sharpened by filing rigid either by clamping in a special vise, as in Fig. 140, or between two boards in the regular bench vise, as in Fig. 140a. The saw must always be held firmly, so that when cutting the file will produce a solid grinding sound. The file that screeches and screams is The blade of the saw is made clamping the saw fo1 filing. merely being worn out and is not doing good work, be filed from the handle toward the point. All saws should Rip Saw After setting, the teeth of the rip saw are filed square across the blade--that is, at right angles to the blade both horizontally and ruing. vertically. If the adjacent teeth are filed from opposite sides, as C and D, Fig. 141, the cutting edge will be given a slight bevel which will make each tooth cut with a shearing action, thus increasing the ease and efficiency of the cut, as is shown by the experiment with the knife, Fig. 137d, page 91. Filing for hard and soft wood cutting. Fig. 141 is a true mechanical drawing, with the exception that in the plan (B) the perspective is added, in order to show more clearly the set in the teeth and the effect of filing from both sides. The angle (F, Fig. 141) at the point of the tooth is changed by changing the direction of the line (G), the advancing edge of the tooth being always the same. For hardwood sawing the angle (F) is more obtuse and the teeth are smaller than for sawing soft wood. The Crosscut Saw The general shape of the crosscut saw and the reasons for making it as it is are given on pages 5 and 6, Figs. 3, 4, and 5. The Filing, adjacent teeth of the crosscut saw are filed from opposite sides. The file is held at right angles to the vertical face and at an a...