Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 92

The triangular file shown by Fig. 276 is the one usually adopted in sharpening English hand saws. Its size varies with that of the saw for which it is required. It is economical to use a double-ended saw file as shown by Fig. 277; when one end has become dull, the file may be reversed, and the other end used. For sharpening American cross-cut saws the file shown by Fig. 278 is used, and for American rip saws that shown by Fig. 279. Saw files are generally cut in three degrees of fineness, a second cut or smooth-cut file being best for sharpening a hand saw. A file for sharpening saws must be of the very best quality. See that the teeth are cut perfectly even, and that the colour of the file is uniform. If it is of whitey-grey colour throughout, it shows that the temper is uniform; but if it is mottled, the temper probably is uneven. For levelling down or topping saw teeth preparatory to sharpening, a flat file (Fig. 280) will be necessary.

Fig. 279.—File for American Rip Saws.

Fig. 280.—File for Topping Saw Teeth.