Foundry Practice; A Treatise on Molding and Casting in Their Various Details

Foundry Practice; A Treatise on Molding and Casting in Their Various Details

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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. 1909 edition. Excerpt: ...drawn out when first inserted and the hole reamed, as shown at 0. This avoids the danger of the chaplet pulling down the sand around it, as at g, when the chaplet is brought to a better bearing or wedged down after closing the cope. Where the chaplet bears on the slant side of a core, the head should be bent at the same angle ns that of the core, as at i, to ensure a firm bearing. Where the exact shape of the core is not important, a level place may be filed into the core, thus allowing the use of a chaplet having the head at right angles to the stem. The chaplet must not be placed, as shown at h, Fig. 57, for it is liable to slide down the slope, thus tending to displace the core or to crush the sand around the stem of the chaplet. Chaplets may be properly set in the mold and arranged so as to give the best service possible, but still be rendered ineffective by improper wedging. The pressure resisted by chaplets may oftentimes be very great, espedally in large molds. The wedges must be so placed that the pressure may be held without any tendency to move the chaplet sidewise. This cannot be done with one wedge, as that gives the bearing of the stem onto the slant surface. The double wedge, as at m, gives a firm bearing on a surface at right angles to the stem of the chaplet. The taper of the wedges should be very small so as to avoid slipping when the pressure is exerted on them. Many times the chaplet is too short for using wedges alone; then a block must be inserted. This is as, good as the wedges alone when the surfaces of the block and the wedges are kept at right angles to the chaplet. Some of the incorrect methods of wedging with a block are shown at n, r, and s. At n the single wedge has been driven from one side, thus tilting the...
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Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • United States
  • English
  • black & white illustrations
  • 1236877268
  • 9781236877260