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† Enlarged pitch diameter with special tooth form . • 4" Face . 14½° P .A . gears will not operate with 20° P .A. Type A Plain without hubs Type B 1 Web Type B 2 Web with lighten holes Type B Plain with hubs Type A PD B OD Type B PD H P OD Type B 1, B 2 PD B H P OD 2" 2" 2"
Pitch Diameter (P .D .) – The diameter across to the pitch circle which is the circle followed by the centers of the chain pins as the sprocket revolves in mesh with the chain. PD = PITCH SIN (180/Nt) Outside Diameter (O .D .) – The measurement from the tip of the sprocket tooth across to the corresponding point directly across the sprocket.
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Sprocket Nomenclature Bottom Diameter Outside Caliper Diameter Diameter Pitch Diameter Outside Bore Hub Diameter (HOD) Thickness (L.A.C.R) (L.T.B.) Sprocket Nomenclature # of Strands D 160 B 16 H 2 1/4 Single Double Triple Quadruple Blank D E F DS Chain Pitch (measured in eighths) 25 35 40 41 50 60 80 100 120 140 160 180 200
Pitch Diameter - The diameter across to the pitch circle which is the circle (P.D.) followed by the centers of the chain pins as the sprocket revolves in mesh with the chain. PITCH DP = INS (180/Nt) Outside Diameter - The measurement from the tip of the sprocket tooth (O.D.) across to the corresponding point directly across the sprocket.
Martin stock hardened teeth sprockets afford longer chain and sprocket life. Hardened teeth on the smaller sprocket of a roller chain drive are recommended if the drive ratio is four to one or greater or if the smaller sprocket has 24 teeth or less and is running at a speed of over 600 R.P.M. Single-Type C — Steel.
Find the work involved in a sprocket drive when a sprocket has a 12fl pitch diameter with a chain force of 500 lbs. turning 150 RPM. Also find the work, linear velocity, and horsepower needed to turn this RPM. W = F X D W = F X πd X RPM W = 500 lbs. X 3.1416 X 1 ft. X 150 W = 235,620 ft/lb OR W = FXD W = F X πd X RPM W = 500 lbs. x 3.1416 x ...
