Fig 50 The Teeth Of A Crosscut Handsaw After Jointing

Figure 59, the point of tooth No. 1 has just been touched with the file; tooth No. 2 was considerably longer, and much of the tip has been filed away, leaving a large, flat surface; No. 3, due to poor previous filing, was also longer than 1; and No. 4 is larger than any of the others. To file these teeth properly, No. 1 is left as it is; No. 2 is brought to a point by filing against the front edge only; the back of No. 3 is filed with the same strokes of the file as are used for the front of No. 2; and No. 4 is brought to a point by filing the front and back edges until the metal is filed away to the dotted lines. By such a procedure the teeth are brought to the same size and shape.

The correct shape of the teeth of a crosscut handsaw is shown in Figures 60 and 61. It may be noted that the front or cutting edges of the teeth are not at right angles or square to the line of points of the teeth, as are the teeth of a ripsaw, but are 12 deg. more than a right angle. This is the angle at which saws are filed at the factories. If the front or cutting edges were filed at right angles, the saw would draw into the wood too much. It would work hard, and would not make a smooth cut. This angle is often spoken of as the "hook" of the saw. The amount of hook e he/ret;

0 0

Post a comment