From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Leaflet detailing the dimensions and specifications for Crofts Standard Design Variable Speed Gears.
| Identifier | ExFiles\Box 119\1\ scan0216 | |
| Date | 1st May 1938 guessed | |
| LEAFLET 393 CROFTS STANDARD DESIGN VARIABLE SPEED GEARS Horizontal Open Type with Transomes for Motor Complete Power Unit giving Variable Driving Speeds DIMENSIONS TABLE IN INCHES No. of Machine | A | B | C | D | E | EA | EB | F | G | H | J | K | L | M ---|---|---|---|---|---|---|---|---|---|---|---|---|---|--- 5 | 17¼ | 8¼ | 10 | 12¼ | 4 | 5¼ | 3¼ | 3½ | 3½ | 1¾ | 11 | ⅜ | 12 | 8⁹⁄₁₆ 6 | 20¼ | 9¾ | 10½ | 12½ | 4½ | 6¼ | 3¾ | 4½ | 4½ | 2 | 13½ | ½ | 15¼ | 10 9 | 28¾ | 12½ | 12½ | 16 | 6 | 8¼ | 4½ | 5½ | 5 | 2¼ | 18½ | ⅝ | 20 | 13½ 10½ | 32½ | 16 | 14 | 18 | 7½ | 9½ | 6¼ | 7 | 6 | 2½ | 21½ | ⅝ | 23½ | 15 12 | 35½ | 18¼ | 15 | 20 | 8¾ | 10½ | 7½ | 7½ | 6½ | 2¾ | 23½ | ¾ | 25½ | 16½ 15 | 44½ | 22¼ | 19 | 25 | 10½ | 12¾ | 9½ | 9 | 7½ | 3 | 27½ | ⅞ | 30 | 19 18 | 51 | 25½ | 22 | 28½ | 12 | 14½ | 11 | 11 | 9 | 3½ | 30 | ⅞ | 33 | 20 21 | 59 | 29½ | 25 | 32 | 14 | 17 | 12½ | 13 | 11 | 4 | 35 | ⅞ | 38 | 22½ 25 | 68 | 33½ | 30 | 38 | 16 | 19 | 15 | 15 | 15 | 4 | 39½ | 1 | 43 | 24 30 | 82 | 40½ | 36 | 46½ | 20 | 23 | 18 | 18 | 18 | 5 | 47 | 1⅛ | 51 | 28¼ No. of Machine | N | P | R | S | SL | Sw | Sd | T | U | V | W | X | Y | Z | AA{D. Abbot-Anderson} ---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|--- 5 | 13¼ | 5 | 11⅛ | ⅝ | 4½ | ¼ | ¹⁄₁₆ | 7¼ | 3½ | ¾ | 11¼ | 1¼ | 4 | 2½ | 14½ 6 | 16½ | 6⅛ | 15 | ¾ | 5½ | ⁵⁄₁₆ | ¹⁄₁₆ | 9 | 5 | 1 | 13¾ | 1¾ | 4½ | 2½ | 16½ 9 | 22½ | 8⅛ | 19½ | ⅞ | 7 | ⅜ | ³⁄₁₆ | 11 | 6 | 1 | 19 | 2 | 5½ | 3½ | 20 10½ | 25½ | 10¼ | 23 | 1 | 9 | ½ | ³⁄₁₆ | 12 | 7½ | 1¼ | 22 | 2½ | 7¼ | 4 | 22 12 | 27½ | 10¼ | 24 | 1½ | 9 | ½ | ³⁄₁₆ | 13 | 8 | 1½ | 24 | 2½ | 8 | 5 | 24 15 | 33 | 12½ | 29 | 2 | 10½ | ⅝ | ¼ | 13½ | 10 | 1¾ | 28½ | 3 | 10⅝ | 6 | 26 18 | 36 | 14 | 32 | 2 | 12 | ⅝ | ¼ | 14½ | 10 | 1¾ | 31½ | 3½ | 12 | 6½ | 30 21 | 41½ | 14½ | 35½ | 2¼ | 12 | ¾ | ¼ | 15 | 12 | 2 | 36½ | 3½ | 13½ | 7 | 35 25 | 46 | 14½ | 37½ | 2¼ | 12 | ⅞ | ⅜ | 16 | 12 | 2½ | 41 | 4 | 15½ | 8 | 38 30 | 53 | 18½ | 45 | 2½ | 15½ | ⅞ | ⅜ | 16 | 16 | 2½ | 48½ | 4½ | 18 | 10½ | 40 Dimensions above are correct for Crofts "OPEN" Design Variable Speed Gears. For dimensions of larger size units, see Catalogue VG.835. Standard Shaft Extensions are as shown on above diagrams, but can be arranged to suit customers' requirements if stated with Inquiry or Order. Stauffer Lubricators are fitted as Standard for Ball Bearings (Journal and Thrust), but nipples for force feed lubrication can be provided where specified. Powers given in our standard lists are MAXIMUM. To obtain most satisfactory results with most economical upkeep costs and longest life, always select a Variable Speed Gear with a good power reserve. CROFTS (ENGINEERS) LTD. THORNBURY BRADFORD ENGLAND Telephone 4901 (6 Lines) Telegrams: "Crofters, Bradford" | ||