Fig. 75.—Scraper.
A, B, handles for scraper; C, leather palm;
D, scraper plane.
Fig. 76.—Edges
of
Scrapers.
A, beveled
edge; B, square
edge.
56. Edges.—There are two forms of edges used in sharpening scrapers,—the square and the beveled edge; in sharpening either of these, the edge should be filed, whetted, and turned with a burnisher, which imparts a wire edge, indicated in Fig. 76, A and B, which shows enlarged views of the two forms of edges of scrapers. If the eye glances along the edge of a properly sharpened scraper, the edge will appear slightly curved; this edge must be given it by filing. After the scraper is filed, each corner which is to be turned must be whetted to a perfectly keen edge upon an oilstone, as the object of sharpening a scraper is to “turn” this edge at an angle with the sides of the scraper.
Fig. 77.—Angle
of Burnisher
with
Sides of
Scraper.
By “turning” the edge of a scraper is meant pushing the particles of steel which form the corner over so that they will form a wire edge which will stand at an angle with the sides of the scraper. When the edge has been skillfully turned, it will cut like a very finely sharpened and adjusted plane, and will work either with or against the grain without tearing the wood.
Notice carefully the angle of the burnisher with the sides of the scraper, as at a, Fig. 77, and as in Fig. 78, which indicates approximately the angle at which it should be held across the edge when seen in the view illustrated of either a square or beveled-edge scraper, the vertical lines indicating the scraper. The stroke must be from the bottom, up, as indicated. At A, Fig. 79, is shown the top view of the burnisher as it makes each of the strokes in turning the edge of a square edge scraper; notice that the burnisher swings in an angle of about 15°, one stroke only being made at each angle.