Popular Woodworking 2002-02 № 126, страница 87
■ I -, JB^I You can make handles in a wide variety of shapes quickly and easily on a lathe. tang, the larger of the stepped pilot holes can be the same diameter as the diagonal across the tang as measured about one quarter the length of the tang from the bolster. (The bolster is the flared section between the chisel's narrow neck and the tang; it seats against the end of the handle.) Take the measure for the smaller hole about three-quarters of the length of the tang from the bolster. For an untapered faceted tang, make a single pilot hole of smaller diameter than the tang's diagonal measure. The difference in the size of the hole and the tang can be larger in softer woods than harder woods, which have less give and will split more easily. Ferrules These short cylinders of brass or copper bind the handle just above the bolster of the chisel. The bolster and ferrule work together to prevent the handle from splitting when the chisel is driven by a mallet. Chisels and gouges used only with hand pressure need no ferrules. But most chisels have ferrules even if they're intended for fine paring work; some carving tools do not. For many chisels, the greatest risk of splitting the handle comes when fitting the handle, so a ferrule is a good precaution regardless of the tool's intended use. Chisels and gouges subjected to heavy banging are often fitted with a metal hoop at the top of the chisel to prevent splitting at that end. The size of the tang and bolster largely determine the size of the ferrule. If you're replacing a wooden handle, you can reuse the ferrule or use one the same size. If you want to fit a smaller ferrule or you're replacing a com posite handle, make sure there will be enough wood inside the ferrule to accommodate the tang. In general, the diameter of the ferrule must be at least that of the chisel's bolster. If you don't reuse a ferrule, you can make your own from copper tubing sold at hardware stores. Or you can buy brass ferrules for a few cents apiece from Lee Valley Tools. These come in a wider range of diameters than are avail Grind flat facets on a round cast tang made for a composite handle to ensure a tight fit in the new wooden handle. 86 Popular Woodworking February 2002 |
