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).
Justification for machines required at the Clan Foundry based on average weekly machine hours.
| Identifier | ExFiles\Box 144\4\ scan0007 | |
| Date | 26th January 1940 | |
| Clan Foundry To Hs.{Lord Ernest Hives - Chair} from Rm.{William Robotham - Chief Engineer} Rm.{William Robotham - Chief Engineer}2/MH.{M. Huckerby}26.1.40. MACHINES FOR CLAN FOUNDRY. We have gone into the question of the justification of the machines we have asked for for the Clan Foundry, For two months before the war a very careful check was kept of all machining done in the Works for the experimental car sections. Exclusive of machining done in the experimental, the following were the average machine hours per week for each general type of machine:- Centre lathe - 124 Hand turret - 832 Milling - 300 Boring - 138 Grinding - 774 Gear cut - 29 Drilling - 91 IF we take a 96 hour week as being a fully occupied machine we get justification for the following machines Hand turret - 8.7 Milling - 3.1 Boring - 1.43 Centre lathes - 1.30 Drilling - 1.0 Grinding - .54 Gear cutting - .30 The two sections where the machines might not be fully employed are grinding and gear cutting if we take the work that used to be done for us by the Works only. On the grinding machine, however, more experimental work will be done on it than anything else and therefore we consider that it should be located at the Clan. | ||