Foundry Practice; a Treatise On Molding And Casting in Their Various Details
The book Foundry Practice; a Treatise On Molding And Casting in Their Various Details was written by author Tate, James M. (James Murray), B. 1852 Here you can read free online of Foundry Practice; a Treatise On Molding And Casting in Their Various Details book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Foundry Practice; a Treatise On Molding And Casting in Their Various Details a good or bad book?
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With other patterns, in case of patching being necessary the pat- tern must be replaced and the tooth reformed. The gate must always be placed upon the centre of io8 FOUNDRY PRACTICE a gear as the teeth would be very Hable to wash if the metal entered the mold from the rim. The method of procedure in making a gear from a solid pattern may be shown in mal^:ing a mold for the bevel gear shown in Fig. 58. The parting comes at the top or outer diameter of the teeth ?nd at the bottom of the hub at t...he short side of the arms. If a special follow- board or match is made for the pattern, the drag may be placed and rammed. In other cases, a match must be made on the cope. The cope is laid on a sand bed with the pins upward. Sand is filled in and rammed to a height that brings the parting line of the teeth even with that of the flask when the pattern is in position. The sand is rammed around the pattern until the level of the parting is reached. The parting between the arms is more easily made from this side than after the pattern is reversed; so this portion of the parting is made and parting sand put upon it.
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