Elementary Course in Woodwork: Designed for Use in High and Technical Schools ... (Google eBook)

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A. Flanagan Company, 1901 - Woodwork - 117 pages
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Page 15 - ... cutting edge strikes the fibre at right angles to its length, but severs it on each side from the main body, before dislodging it. In the slitting saw, N, Fig. 1, the " rake " is all in front, where the cutting duty is. In the cross cut, as D, the rake is on the side, for the same reason. The length of tooth depends largely upon the duty required. A long tooth has the demerit of being weak and liable to spring ; the merit of giving greater clearance to the sawdust a specially valuable feature...
Page 98 - ... possible. The truss diagram is drawn before commencing to find the strains on the different members of the truss. A Panel of a truss is that portion lying between the centre lines of two adjacent vertical or radial members. Its form may be triangular, rectangular, trapezoidal, or that of a trapezium. A Member of a truss is any straight or curved piece which connects two adjacent joints of the truss. The Upper Chord is composed of the members which form the upper edge or margin of the truss. Each...
Page 15 - In all cases, the size and length of teeth depend largely upon the duty required; a long tooth has the demerit of being weak and liable to spring, but the merit of giving a greater clearance to the saw-dust. The throat space in front of each tooth must be large enough to contain the dust of that tooth from one stroke ; the greater the feed, the deeper the dust chamber required, or, more teeth.
Page 62 - The length of the hypotenuse of a right-angled triangle equals the square root of the sum of the squares of the other two sides.
Page 53 - Where the beams stand square with each other, and the strains are also square with the beams, and in the plane of the frame, the common mortise and tenon is the most perfect junction. A pin is generally put through both, in order to keep the pieces united, in opposition to any force which tends to part them. Every carpenter knows how to bore the hole for this pin, so that it shall draw...
Page 75 - Fig. Ill, in which the two parts A and B are given, each part being lettered to correspond with the position it is to occupy when the sides are joined.
Page 73 - ... and there is no reason why we should not in that branch attain a similar position. One of the most important methods employed by the joiner is that termed dovetailing, which is of three kinds namely, common, lap, and mitre. Common dovetailing shows the form of the pina or projecting parts, as well as the excavations made to receive them.
Page 73 - ... wood-work, and there is no reason why we should not in that branch attain a similar position. One of the most important methods employed by the joiner ii that termed dovetailing, which is of three kinds namely, common, lap, and mitre.
Page 98 - A truss is usually required for spans of more than 20 feet. * The span of a roof is the horizontal distance between the external surfaces of the walls of the building; its rise is a vertical let fall from its ridge to a horizontal line joining the intersections of the external surfaces of the walls and the roof surfaces. The inclination of a roof equals the angles between its surface and a horizontal.
Page 15 - B, it is evident it will push harder and will not cut as smoothly as if it was inclined forward as at A ; it follows then that the cutting edge of a cross-cut saw should incline forward as at C, rather than stand perpendicular as at D.

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