Cyclopedia of Drawing

Cyclopedia of Drawing

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...using metal of heavier gauge than number 20, for pipes. elbows, or any other work, it is necessary to have the exact inside diameter. It is customary in all shops working the heavier metal, to add a certain amount to the stretchout to make up for thu loss incurred iti I lending, in order that the inside diameter of the article tpipe, stack, or boiler shell i may be kept to a uniform and desired size. This amount varies according to different practice of Murkmen, some of whom allow 7 times the thickness of the metal used, while others add hut 3 times the thickness. Theoretically the amount is 3.l410 times the thickness of the metal. For example, suppose a boilvr shell or stack is to be made 4S inches in diameter out of A-inch thick metal. If this shell is to measure 4S inches on the inside, add the thickness of the metal, which is A inch, making 4SA inches. Multiply this by 3.1410 and the result will be the width of the sheet. If, on the other hand, the outside diameter is to measure 4H inches, subtract the thickness of the metal, which would give 47A inches and multiply that by 3.1416 which would give the proper width of the sheet. It is well to remember that no matter what the thickness of tinplate may be, if it is not added, the diameter of the finished article will not be large enough; for where no account is taken of tinthickness of the metal, the diameter will measure from the center of the thickness of the sheet. While this rule is theoretically correct there is always a certain amount of material lost during the forming operations. It is, therefore, considered the best practice to use seven times the thickness of the metal in question. The circumfereiice for a stack 4S inches in diameter inside using A inch metal would be. on more

Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • United States
  • English
  • black & white illustrations
  • 1236815602
  • 9781236815606