A Course of Instruction in Engine And Boiler Design Arranged for Students of Th
A Course of Instruction in Engine And Boiler Design Arranged for Students of Th
James D James David Hoffman
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2 D + 1. 5" (M. A. ) : Piston face / = . 43 D. In all the above, L = length of cylinder in inches and D = diameter of cylinder in inches. For shapes of piston details, see Whitham .... '. Pages 1 1- 25 Unwin Vol. II, Pages 136-159 Low & Bevis Pages 229-238 Holmes Pages 208-213 Packing 1 Rings: Packing rings are turned about j 3 e -", to each foot of diameter, larger than the cylinder, and a portion is then cut out of them so the ends just come together when fitted for use. A good thickness for ...rings is t = . 03 D (M. A. ) : t = . 8 iv where w = width of ring in inches. The width of rings varies a great deal according to various authorities. Unwin w = . 014 D + . 08". Whitham w = . 15 D In the two formulas the width of the ring would vary in a 10" cylinder by a factor of 7. In practice, the piston ring varies from a width of fy$" in the smaller sizes to %" in the larger sizes. (M. A. ) : w . 055 D. Cylinder Walls: It will be found, in figuring the cylinder walls to resist the internal pressure, that even if we allow a large factor of safety, the calculated sizes run much below the sizes commonly used in practice.
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