Fig. 38.
17. Saw Filing.
—Learning to sharpen a saw is a difficult thing—so difficult that it is not considered within the province of a book on elementary woodworking to treat of it. One who uses saws, ought, however, to know the steps which are taken to put a saw in order.
Fig. 39.
The teeth are first set. [Fig. 39] shows a common form of saw-set in position. Beginning at one end of the saw, every other tooth is bent outward by means of this instrument. The saw is then reversed and the remaining teeth are similarly treated.
As these saw-sets are adjustable, the teeth may be bent much or little as the work to be done demands.
Second, the teeth are jointed. A flat file is run lengthwise over them the full length of the saw so that none of the teeth may project more than others. [Fig. 40] shows a flat file in position for jointing. This block keeps the surface of the file at right angles to the blade of the saw.
