Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

409 OF ENGINEERING F0BMULÆ. Power absorbed by Shafting. About 1 horse-power for every 100 feet of 3-inch shafting making 120 revolutions per minute. Keys and Keyways. QJ. Richards.) T) = niameter of shaft in inches. b = Breadth of key — 8182 D. , d — Depth of key = B + A lnch- , a = Depth of key in boss = -07 I> + inch, say = 'la. c = Ditto in shaft = • 101 D + yj inch, say = • 6 d. Clearance at the top of key = -s\- inch. The top and bottom of the key are left rough; the sides only are fitted ; the nearest 16ths as calculated above may be adopted. Table of Dimensions in Inches. 6 H 4 4 Dimensions of Eyes of Wheels and Pullets (Staked). Diameter of shaft .. .. 1 f j Diameter of eye of wheel! 3t Diameter of eye of pulley j 3| | 2 4 3i 2} 4+ 3i 2t 6f 3 5i 5 N 6 I 5i