Machine Design Databook, Second Edition

| a | width of pulley face, m (in) pivot arm length in Rockwood drive, m (in) | |
| a 1 | width of belt, m (in) | |
| A = 0.4( ? d 2/4) | useful area of cross-section of the wire rope, m 2 (in 2) | |
| b | thickness of arm, m (in) dimension in Rockwood drive (Fig. 21-5), m (in) | |
| c | dimension in Rockwood drive (Fig. 21-5), m (in) | |
| C | center distance between sprockets (also with suffixes), m (in) center distance between pulleys, m (in) capacity of conveyor, m (ft 3) constant depends on the rope diameter, sheave diameter, chain, the bearing, and coefficient of friction [Eqs. (21-59) to (21-62) and (21-86) to (21-103)] (also with suffixes) | |
| C 1 | tooth width in precision roller and bush chains, m (in) | |
| d | size of chain, m (in) diameter of shaft, m (in) diameter of idler bearing, m (in) diameter of smaller pulley, m (in) diameter of rope, m (in) pitch diameter of sprocket, m (in) | |
| d 1 | diameter of small sprocket, m (in) hub diameter of pulley, m (in) | |
| d 2 | diameter of large sprocket, m (in) | |
| d a | tip diameter of sprocket, m (in) | |
| d a1 | tip diameter of small sprocket, m (in) | |
| d a2 | tip diameter of large sprocket, m (in) | |
| d c = f pF b | equivalent pitch diameter, m (in) | |
| d f | root diameter of sprocket, m (in) | |
| d |