Castings Volume 8-10

Castings Volume 8-10

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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. 1911 edition. Excerpt: bevel protractor for its angle with the surface of the test-bar. The air regulator a was kept wide open during the tests. The desired air pressure in the machine was secured and maintained constant by adjusting the stop valve in the supply pipe to the moisture separator. Temperature, Air Pressure and Weighing After starting the air blast and carefully adjusting the valve to maintain a constant pressure at the machine, the sand-controller handle d was moved to its open position at the instant of starting, thus allowing sand to flow into the mixing chamber and be forced by the blast of air out through the nozzle and against the test piece. Readings of the temperature and pressures of the air on the main line and at the machine were taken at regular intervals of about two minutes. In closing down the machine at the end of a test, the sand valve was first closed and then the air valve; the test-bar was weighed, and the difference of the two weights gave the amount of iron removed; the sand discharged was weighed, sifted and again weighed. Variables of the Tests Starting at Z) pounds corrected pressure at the machine on the first test, and increasing by 10 pounds up to and including 70 pounds pressure, the variation in the effectiveness of the blast due to increase of pressure was obtained, with the nozzle set at 45 degrees and at 8 inches from the test-bar. In the second series of tests, a constant pressure of 60 pounds was maintained at the machine, and the nozzle set at 8 inches from the test-bar. The angle was varied from 30 to 90 degrees. The efiectiveness of these angles of blast was in this way obtained. _ In the third series of tests, the distance of the nozzle from the test piece was varied, the angle being set at 45 degrees more

Product details

  • Paperback | 498 pages
  • 189 x 246 x 25mm | 880g
  • United States
  • English
  • black & white illustrations
  • 1236975669
  • 9781236975669