Saw Sets. Fig. 75 shows a simple form of set. The tooth to be bent is placed on the surface A, with

1 Frequently called "three-square saw file." the adjacent teeth in contact with B, B. Thus placed, the blade is allowed to rest on the screw C. A blow from a hammer on D bends or "sets" the tooth, and a spring returns D to the position shown.1 The amount of set is regulated by the position of the screw C, and is greater, the lower C is fixed. If C is raised to coincide with the dotted line AE, the tooth will not be set. B, B can be adjusted to the depth on the tooth to which the set is to take effect.

60. Swedge Sets for Ripping-Saws, illustrated by Fig. 76, are in general use on large saws and, occasionally, on small ones; generally speaking, they do not concern the bench-worker. The set is driven against the edge of the tooth, as shown by Fig. 77; by using one opening the center of the tooth is forced back, as at H; and by use of the other opening the points are spread, completing the work, as at G. A tooth thus set is more perfect in its action than when bent, since it cuts the full width of the kerf.

Fig. 75

Fig. 76

Fig. 77

1 D is not well shown in the engraving. Since it must act on only one tooth at a time, the end X is wedge-shaped.

61. Saw Clamps are convenient for holding the saw during the filing process. Carpenters frequently make for themselves clamps similar to that represented by Fig. 78. It consists of two pieces of hard wood joined face to face by two screws (one near each end), by means of which the clamp may be fastened rigidly to the blade of the saw. It may then be fastened in the vise or held on the knee while the saw is being filed. A much better device is the saw clamp shown by Fig. 79, which, while fastened to the bench, so holds the saw that it may be turned in almost any direction, thus enabling the workman to obtain a favorable light.

Fig. 78

End.

Side.

Plan.

Fig. 79

To File and Set a Saw.