Notes On the Design of Machine Elements for Use in Connection With Unwins Machi
Notes On the Design of Machine Elements for Use in Connection With Unwins Machi
John Henry Barr
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The stay bolt itself should have a minimum area of cross- section (at the bottom of the threads) sufficient to carry a load = pa 2, with a stress not over 6, 000 to 7, 000 for wrought iron, and 7, 000 to 8, 000 for steel. 51. Diagonal Stays. [Unwin, 76, pages 137-138]. Gusset stays (Unwin, Fig. 81) are liable to unequal tension across the thin broad section, so that the maximum intensity of stress at the edge may be excessive, even though the nominal (mean) intensity of stress is quite moderate.... The diagonal stay (Unwin, Fig. 80) is to be preferred to the gusset stay. 52. Bridge or Girder Staying. [Unwin, 763, pages 138- 141]. 53. Direct Stays. In marine boilers, or others having large diameter and relatively, small length, the portions of the flat * These values are taken from Low's Pocket Book for Mechanical Engi- neers. 92 - heads which are above the tubes are commonly stayed by long bolts passing through the steam space from one head to the other. These bolts have nuts with washers on the outside, and they should be spaced so that each of the different bolts support approximately the same area of plate.
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