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 Borg & Beck Co. Ltd. concerning excessive run-out on tested Phantom III clutch driven plates.
| Identifier | ExFiles\Box 129\1\ scan0241 | |
| Date | 12th August 1937 | |
| 110 Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}10/JH. 12th August, 1937. Messrs. Borg & Beck Co.Ltd., Tachbrook Road, Leamington Spa. Dear Sirs, Phantom IIIClutches. With regard to the 6 driven plates received yesterday, we regret to inform you, that on testing them, we find the run-out to be very excessive. The figures we obtain are as follows. Engine Side Spring side. 1 .025 .020 2 .022 .050 3 .025 .025 4 .035 .035 5 .034 .048 6 .020 .035 We do not know to what extent the run-out may have been upset in transit, but these figures do suggest that exceptional care is necessary in handling and packing, and we have advised our necessary stores and other departments to handle these plates with the greatest care, as this type of cushion plate is more susceptible to damage than those without cushion springs. We would also observe that in one or two cases, the ends of the cushion springs are not pressing on the centre plate, and this must add considerably to the difficulty of obtaining a minimum run out. We suggest that this may be due to insufficient cambre on the spring plate in its free state, or to excessive distortion of the spring when rivetted on to the floating facing. | ||