Machinists' and draftsmen's handbook, containing tables, rules and formulas, with numerous examples explaining the principles of mathematics and mechanics as applied to the mechanical trades; intended as a reference book for all interested in mechanical work (1910)
Lobben, Peder, 1858- · New York, D. Van Nostrand company · leaf 330
he Screws. When friction is not considered, the force which may beexerted by a screw (see Fig. 18) will be: F X7?X2tt r, W X P P W screw acts as a press.F = Acting force. R = Radius in inches at which the force acts.P = Pitch of screw in inches. FIG. 18 Regarding friction inscrews, the thread of a… … F= WX P +/ X d - rdn — fX P X R F = Force, acting at a radius of R inches. W = Weight. P = Pitch of screw in inches. / — Coefficient of friction, usually taken as 0.15. R = Radius in inches at which the force is acting. r == Middle radius of screw in inches. d = Middle diameter of screw in inches.…
Mechanical engineering
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