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).
Letter to Messrs. Borg & Beck Co. Ltd. confirming specifications for Phantom III driven plates.
| Identifier | ExFiles\Box 129\1\ scan0187 | |
| Date | 16th June 1937 | |
| 1110 Experimental Dept. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}1/JH. 16th June, 1937. Messrs. Borg & Beck Co.Ltd., Tachbrobk Road, Leamington Spa. Dear Sirs, With reference to the visit of the writer to you Works on the 11th inst., we have much pleasure in confirming the main points discussed by us as follows, and we would be glad to know if you are in full agreement. Phantom III. 100 driven plates to Ex.27309 to be made up as follows :- Hubs & rivets securing hub and plate to be supplied by R.R. Borg & Beck to drill plate and rivet to hub, so that they can set it true and balance it. Plates to be ground on both sides. Agreed that the outside dia. be 13.600". The holes and segmental gashes in the first 100 plates will be drilled and milled, but if orders for quantities placed later, dies will be made. Facings, to be of Thermoid, ordered from America, those so far received have been .138 thick, but if possible, the fresh supplies will be .125 thick in order to reduce the inertia of the driven unit. Rivets for facings. The question of countersunk headed verses flat headed rivets was discussed at considerable length, and it was considered that the standard countersunk rivet as used by Borg & Beck would provide the greatest wear allowance with the maximum strength of lining under the head, provided that the head is not "cupped" in the process of rivetting, and this will be insured by using a punch of larger diameter than the rivet head. | ||