Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 261
depth of the leather does not affect the friction of the ram. The experiments resulted in the following formula: Total friction, lbs. = CXram diam., ins.Xpres. per sq. in., lbs. The value of C for new, hard, badly lubricated leathers was .0471and for well-lubricated leathers in good condition… … Fig. 22.—High-pressure hydraulic stop valve. Table 21.—The Frictional Resistance of Cup LeatherHydraulic Packing Diameter, inches Friction, per cent. Diameter, inches Friction, per cent. 2 2.0 12 0.33 3 1-33 13 0.30 4 1.0 14 0.28 S 0.80 IS 0. 26 6 0.66 16 0.2s 7 0.57 17 0.23 8 . 0.50 18 0.22 9 0.44…
Machine design
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