One very common fault of beginners in scroll band-saw filing is that of bearing too heavily on the file, and I may say that I have lately seen a man who has been filing more or less for the last dozen years who had never discovered why his saws got so badly out of joint. It is a fact that scroll bands need very little jointing if they are filed with the proper care and frequency. A small saw does not have to be very dull before it will refuse to cut freely, and the reason of this is because of its small teeth. So if the saw is filed as often as it should be, a slight stroke of the file will restore its cutting points without taking away much of the substance of the the teeth. But when a man gives a full, strong stroke to a little tooth it is quite perceptibly shortened, and at the same time takes fully twice the time that a light stroke requires, thus resulting in twice the time and half the efficiency of the proper method.
Another perplexing thing in connection with the band-saw, and it is not confined to scroll bands either, is that sometimes the man who makes the brazes does not understand the difference between a solder and a braze. If the irons or the torch are not hot enough to flux the solder with the steel, thus making an alloy, the two surfaces of the steel are apt to be soldered together and in appearance present a good joint. In such a case, however, the solder is apt to come apart when the saw is folded or while the joint is being dressed.
In this connection may be added a word about the mistaken idea that borax should be put in the joint between the lap of the saw. With that practice there will be generated a certain amount of gas which will partially prevent a perfect flux of the silver and the Steel. Put the borax on the outside and a sufficient amount will find its way in from the outside.
One of the mean jobs for the millwright is to cut a large or thick belt lengthwise. The writer spent some little time sweating over this kind of work before he caught on to the simple trick of splitting them on the rip-saw, although he had often cut the ends off with a fine handsaw.