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A Text-Book of Elementary Foundry Practice; For the Use of Students in Colleges and Secondary Schools

A Text-Book of Elementary Foundry Practice; For the Use of Students in Colleges and Secondary Schools


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About the Book

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. 1910 Excerpt: ... oven F1g. 63. similar to the one shown in Fig. 63 is used. These ovens are made of brick or of iron. The iron ones are portable. They consist of an ash pit, a fireplace, and an oven. The front of the oven is a series of doors, to which shelves are attached. These shelves are perforated to allow the heat to pass from one to the other. On the back of the shelf is a plate the size of the door. When the door is opened and the shelf drawn out, the back plate closes the opening. In this way the loss of heat is prevented. In a foundry doing large work, an oven will be found capable of taking the largest pieces made. Very large ovens are fitted with tracks so that the pieces can be run in and out on cars. The portable oven is the most desirable for school use. Finishing.--Before a core is used it should be given a coat of blacking. This will give the core a smoother surface and leave a smoother, better hole in the casting. A good blacking for light cores is made as follows: Mix one cup of molasses in a pail of water; into this stir powdered charcoal until an even coating of black will be deposited on the core when dipped thereinto. For heavy work, take one part of charcoal and two parts of graphite and mix with a thick clay wash. The light cores can be dipped into the blacking. In the case of large cores, the blacking should be put on with a brush. CHAPTER VIII MOLDING EXERCISES WITH DRY CORES In the preceding chapter the composition, making, and baking of dry cores was given in a general way. In this chapter a few exercises will be taken up to bring out special ways of venting, forming, and setting some of the simpler forms. Venting Cores.--The heat of the metal, by burning the binders and other constituents of cores, forms gas. This gas, as well as that in the s...


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Product Details
  • ISBN-13: 9781130161465
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130161463
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr

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A Text-Book of Elementary Foundry Practice; For the Use of Students in Colleges and Secondary Schools
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