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The Principles of Pattern Making; Written Specially for Apprentices and Students in Technical Schools

The Principles of Pattern Making; Written Specially for Apprentices and Students in Technical Schools


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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. 1903 Excerpt: ... to 1J" should not as a rule be exceeded for the thickness of loam boards and core boards of moderate length. Boards having irregular outlines must often be framed together, in order to avoid shortness of grain. An example of such a form occurs in Fig. 76. Striking boards are frequently employed to make patterns in loam, to save the cost of wood. From a pattern made in loam, dried, and coated with tar, a good many moulds may be taken, --eight, or ten, perhaps, if used carefully. A good many patterns of large size, which are required for temporary purposes only, are made in this way. Fig. 79 shows the board and bar arranged for striking up the pattern of a large air vessel. This method is adopted in many cases. Thus, if the diameter of the casting is such that a man cannot stand within to strike a board around--say of two feet or less in diameter--a loam pattern is made, and moulded either in green, or in dry sand, just as though it were of wood. A loam pattern in this case is much cheaper than one in wood, and answers the purpose very nearly, or quite as well. In other cases the choice would lay only between patterns made in loam, or in wood, a loam mould being altogether too costly, In Fig. 79, A is the board, B the trestles, C the loam pattern, D the core bar, E the handle by which it is revolved, F the core print, Gr the neck of the vessel, aa the turned journals of the bar. It is evident that these boards will only strike symmetrical forms. When castings are in the main symmetrical, they often have flanges, facings, brackets, bosses cast with them also. These are then necessarily prepared just as though the entire pattern were of wood, and are fitted and attached to the loam pattern, or embedded in the loam mould, as the case may be. When these fitt...



Product Details
  • ISBN-13: 9781235924644
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1235924645
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr

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