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).
Instruction to the Technical Committee concerning the design and performance of worm gears.
| Identifier | ExFiles\Box 2\6\ B002_X 140 141 157-page177 | |
| Date | 19th February 1912 | |
| R.R. 3000-8-10. Wt. 1475. (G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 180.) ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Technical Committee Order No. Customer's No. Re: Worm Gears between the worm considered as a rack, and the Warm wheel considered as its pinion, In addition to this we have a further reduction in area of contact due to the interference of the milling cutter when the thread is being cut, due to the warping of the top & bottom angles of the thread. The tooth with larger obliquity is free from both this source of interference & reduced contact surface & therefore gives a worm capable of more load for similar dimensions. In addition to this I have further direct evidence shewing superiority of the larger obliquity, as I know that the London General Omnibus Co carried out extensive experiments with different worms having varying obliquities of tooth action, when they Signed This Sheet must be filed on completion of the work. | ||