constants about some materials, Schemes and Mind Maps of Mechanics

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Table 8-4 Screw Bearing Safe py, Pp: Notes Pressure pp Steel Bronze 2500-3500 Low speed Source: H. A. Rothbart and Steel Bronze 1600-2500 =10 fpm T. H. Brown, Ir., Mechanical Cast iron 1800-2500 <8 fpm Design Handbook, 2nd ed., McGraw-Hill, New York, 2006. Steel Bronze 800-1400 20-40 fpm Cast iron 600-1000 20-40 fpm Steel Bronze 150-240 =50 fpm Table 8-5 Nut Material Coefficients of Friction f Steel Bronze Brass Cast Iron for Threaded Pairs Steel, dry 0.15-0.25 0.15-0.23 0.15-0.19 0.15-0.25 Source: H. A. Rothbart and Steel, machine oil 0.11-0.17 0.10-0.16 0.10-0.15 0.11-0.17 T.H. Brown, Jr, Mechanical Design Handbock, 2nd ed.. Bronze 0.08-0.12 0.04-0.06 = 0.06-0.09 ‘McGraw-Hill, New York, 2005.