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).
Technical instruction memo discussing the design and adaptation of worm gears, focusing on tooth angle and obliquity.
| Identifier | ExFiles\Box 2\6\ B002_X 140 141 157-page178 | |
| Date | 19th February 1912 | |
| R.R. form No. 178 (2M 10-11 G.W.B.) ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Technical Committee Order No. Customer's No. Re: Worm Gears first considered adapting a worm drive a standard & in the result they adapted a 60° angle tooth 30° obliquity. I am also aware that messrs D.{John DeLooze - Company Secretary} Brown & Sons (worm experts) when consulted now recommend a larger obliquity than shown in their tables. The smallest obliquity to be used is a function of the diameter of worm & its lead but there is no advantage to be gained by using this shape & it is well to be on safe side & be sure of getting no interferences by using from 45° to 60° for any diameter of worm, I consider 45° to be about a right obliquity (22 1/2°). Signed: RMAPB This Sheet must be filed on completion of the work. | ||