Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 110

In attempting to cut down a piece of wet plank with a hand saw, great labour and difficulty will be met, and the difficulty will be much increased if the cut is made across the grain—that is, transversely to the direction of the fibres. If the stuff is very thick, the saw blade will stick fast in its kerf. There are two reasons why the saw sticks in soft wet wood. One is that the kerf is not wide enough, and the other that the sawdust cannot get away quickly enough. Hence the remedy is to increase the set and to enlarge the spacing of the saw teeth, which means an increase of the space between the centres of the teeth, with a consequent increase in the sizes of the teeth themselves. In attempting to use the same saw on thin and hard wood, trouble of another kind will be met. The teeth will catch in the wood, the saw will sway too loosely and freely in the kerf, and, if cut across the grain, the timber will become broken or spalted out.