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Saw-sharp′en-ing ma-chine′.

A machine for grinding, filing, or swaging teeth of saws.

Saw-sharpening machine.

In Fig. 4636, a disk of consolidated emery is employed. This is journaled on a counterbalanced arm, so as to be presented to the teeth at any required angle, and rotated by band and pulley. The saw is held by a vise with wooden jaws, clamped to the table. For sharpening circular saws, this is removed and replaced by another of different form. See also saw-grinding machine.

The angles at the points of saw-teeth are in general more acute in proportion to the softness of the material to be operated on, varying from 90′ for metals and very hard woods to 60′ or less for soft woods. To insure the action of each tooth, their points must be in the same straight line (in rectilinear saws), and for this purpose they are topped by laying the file, without its handle, flatwise upon their points and reducing them to the same level by a few strokes of the tool.

More force is applied to the file in sharpening the teeth near the ends of the saw than at the middle, where they are more worn.

There are five different methods usually employed, depending on the character of the teeth.

The first (Fig. 4637) is applicable to the smith's frame-saw, the teeth of which have no set. The saw being held in a vise, face upward, the teeth are lightly hammered, by which they are slightly spread or upset and reduced to the same general level. The file is then applied, being held so as to form a right angle both vertically and horizontally, with the saw-blade.

2. Peg, M, and mill-saw teeth in general are sharpened, as shown at b, by applying the file to the faces of the teeth in the [2045] direction indicated by the dotted line; several of the teeth are thus treated, operating from one side of the saw; the workman then operates from the other side, applying the file to the alternate faces, which have been left untouched, in diametrically opposite direction; this process is continued a few teeth at a time throughout the entire length of the saw, after which the two remaining faces of each tooth are filed in a similar way.

Saw-teeth.

3. Hand-saw and other teeth, having angles of 60°, are sharpened by first filing the oblique faces until they coincide with one dotted line, next the backs of the same, then the other oblique faces and their backs.

4. Wood-pruning saws d, which are made thicker on the face than at the back, are sharpened by a triangular file applied very obliquely in a horizontal direction, sometimes at an angle exceeding 45°, as shown by the oblique lines.

5. In sharpening gullet or brier teeth e, the gullets are first filed with a round-edged file, somewhat smaller than the gullet, which gives a concave face to the tooth; it is then employed on the back of the preceding tooth; the top being filed last with the flat side of the file. The setting (see saw-set) is afterward performed.

1877.

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