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accuracy allowable stresses angle angle of friction antifriction antifriction bearings axial axle ball belt drive bending bevel bolt calculations cast iron centre distance chain clearance coefficient of friction cold hardening components compression compressive stress coupling cross-section decrease deformation depends determined diameter discs elastic ensure equal equation flat belts fluid friction formula friction drives friction forces friction surfaces grooves heat helical increase joint kg/cm layer length limit of endurance lines of contact lubrication m/sec machine elements magnitude material maximum mechanical metal method module number of teeth obtain operation peripheral velocity pinion pitch pulleys radial reduced reduction gears rigidity rivets roller rotation screw shear shown in Fig sliding splines spring sprocket steel straight-tooth strength stress concentration Table tension thickness thread thrust bearing tion toothed gears toothed wheels torque transmitted V-belts values velocity ratio viscosity wear weld width worm gear