Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

393 OF ENGINEERING F0KMUI.Æ. Stbength of Teeth of Wheels. (Cast Iron.) B — Breadth of teeth in inches. P = Pitch of teeth in inches. V - Velocity of pitch line in feet per second. 11 — Actual horse-power which may be trans- mitted by wheel. _____ _____ H^-OOPWB. p = vWvb' Proportions os' Teeth of Wheels. = Pitch : = Pitch — Pitch = Pitch — Pitch = Pitch Pitch X 2- p = ___________________ X 033 X 0’75 X 0-45 X 0'55 X 0-45 X 045 From pitch line to top of tooth .. Total depth of tooth .. .. .. Thickness of tooth on pitch line.. Space between teeth on pitch line Thickness of rim of wheel .. .. Thickness of arms if flat .. .. Ordinary width of teeth in small pitches ,. .............., In large______________________= Pitch x 3- Thickness round centra .. .. — Pitch x 1’3 Mortise wheels to be wider than iron wheels by twice the thickness of the rim or by pitch, x 0’9 ; their rim to be double the thickness of that of