Mechanics' Tools

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Sargent & Company, 1911 - Hardware - 250 pages
 

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Page 31 - run " is 11 feet, and the "pitch " £ (or the "rise " ^ the width of the building), then the rafter length will be 15 6 8, or 15 feet 6^ inches. If the "run " is 25 feet, add the rafter length for "run " of 23 feet to the rafter length for " run " of 2 feet. When the "run" is in inches, then in the rafter table read inches and twelfths instead of feet and inches.
Page 31 - The rafter table is used in connection with the marks and figures on the outside edge of the square. At the left end of the table are figures representing the run, the rise and the pitch. In the first column the figures are all 12, which maybe used as 12 inches or 12 feet, and they represent a run of 12.
Page 35 - ... Ab; lay off in the same way the space from the point B as Bd and Be; also Cf and Cg and Db and De. Then draw the lines ab, ed, ef and gh. Cut off the solid angle E, also F, G and H; there is left an octagon, or "eight square" stick. This is nearly exact. Brace Measure. — This is along the center of the back of the "tongue," and gives the length of the common brace.
Page 34 - ... obtain the bottom and top cuts of common rafters and jack rafters use the figure 12 on body, and whatever figure your roof raises to the foot on tongue. This gives correct cuts in all cases. Always remember that the cut comes on the tongue, or last named figure. It is so arranged in all cases. Octagon, "Eight-square
Page 31 - run" is 12 feet 4 inches, add the rafter length of 4 inches to that of 12 feet, as follows: — For "run" of 12 feet the rafter length is .... 16 ft.
Page 109 - To sharpen the spur of an auger, hold the bit in the left hand with the twist resting on the edge of the bench. Turn the bit around untH the spur to be sharpened faces up.
Page 31 - Table includes the outside edge graduations of the back of the square on both body and tongue, and is in twelfths. The inch marks may represent inches or 'feet, and the twelfth marks may represent twelfths of an inch or twelfths of a foot (that is, inches) as a scale. The edge graduation figures above the table represent the "run" of the rafter, and under the proper figure on the line representing the "pitch," will be found in the Table, the rafter length required. The "pitch" is represented by the...
Page 34 - ... eight square" or octagon stick of timber from a square. c. FIG. 9. OCTAGON SCALE Suppose the figures A, B, C, D, Fig. 9, is the butt of a square stick of timber 6x6 inches. Through the center draw the lines AB and CD parallel with the sides and at right angles to each other. With the dividers take as many spaces (6) from the scale as there are inches in the width of the stick, and lay off this space on either side of the point A as Aa and...
Page 62 - Pour a few drops of machine oil on the stone or if no machine oil be available, use lard oil, or sperm oil. The best results are obtained by using a carborundum stone. The carborundum cuts faster than most other abrasives. Hold the chisel in the right hand and grasp the edges of the stone with the fingers of the left hand to keep from slipping; or better , place the stone on a bench and block it so it cannot move. Both hands will thus be free to use in honing.

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