Metal-Work; A Handbook for Teachers and Students

Metal-Work; A Handbook for Teachers and Students

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...thin plates or sheets. The pick-up tongs (Fig. 128), as their name implies, are used for picking up rivets, small round bars, etc., and also for holding metals for tempering. These tongs are very useful in the handicraft-room. The hollow bit tongs (Fig. 129) are used for grasping round, square, hexagonal, or octagonal bars. Bolt tongs (Fig. 130) are for holding bolts, rivets, etc., the head being cleared by the " spring " in the jaws. The " reins," or handles, for forge tools in the handicraftroom should not be more than = inch diameter. Forge Work.--Forging can be classified into four primary and five secondary operations. P-rimary Operations. 1. Bending, as in rings, links, hooks, etc. 2. Drawing-down, as square and round points, chisel-ends, Secondary Operations. 1. Punching square, round, or rectangular holes. 2. Cutting. Parting ofi a bar into various lengths or removing surplus material. 3. Annealing. Softening hard metals, such as cast-steel. 4. Hardening and tempering. Cutting tools and springs. 5. Case-hardening. Obtaining a hard skin on soft steel or wrought-iron. The objects which can be made by forging are of endless shape, size, and degree of hardness, but all resolve themselves into a recurrence or combination of the primary or secondary operations stated, the former being most frequent. I-Ieats.--Wrought-iron and mild-steel will sustain any degree of heat up to their melting-points without injury; but cast-steel must be heated with great care. If it be heated above blood-red, it loses its carbon, crumbles under the hammer, and will not harden. Steel which has thus been overheated is said to be " burnt." The four chief degrees of heat which can be readily distinguished when forging are 1....
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Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236561066
  • 9781236561060