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).
Standardisation of an increased inertia and stiffer camwheel to overcome camshaft oscillations.
| Identifier | ExFiles\Box 171\5\ img055 | |
| Date | 31th August 1938 | |
| RR 755A (10H) (49368) 19/10/37 C.E.Co. 25/30 H.P. WRAITH STANDARDISATION OF PARTS Description: INCREASED INERTIA AND STIFFER CAMWHEEL. Purpose: To overcome camshaft oscillations. Date Issued: 31.8.38. Sheet No.: W.2. Drg. No.: SCD.803. L.O.P.S. Brief Report and Remarks: As reported in Rm.{William Robotham - Chief Engineer}1/MH.{M. Huckerby}11.7.38. investigations showed that coupled with more flexible dynamo coupling, oscillations were effectively reduced by increasing the camwheel inertia by means of loose rings attached to original camwheels. The result has been confirm by cutting out vibration period hitherto experienced on road. This sheet to release order for new design camwheels which should not be fitted until run by exptl. and confirmed as satisfactory by Rm.{William Robotham - Chief Engineer} when memo. will be issued to this effect. COSTS TABLE Old Parts - Material: £0.4.9., Labour: £0.6.5., Burden: £0.11.3., Total: £1.2.5. New Parts - Material: £0.4.9., Labour: £0.6.8., Burden: £0.11.8., Total: £1.3.1. Increase in Cost £ 0.0.8. Handwritten initials: GRH 30/9/38 Cost of Tools £ 30.0.0. Production Position and Comments: Increased inertia and stiffer camwheel to overcome camshaft oscillations has been fitted to the 25th. chassis in 'A' series & onwards. Introduction of the modified camwheel at this point rendered scrap 68 camwheels total value £6.10.0d. A tool cost of £30.0.0d. was involved whilst Factory cost of chassis is increased by 8d. with new design. RHC.{R. H. Coverley - Production Engineer} Authorisation to Proceed. Introduce on the 25 Chassis in A Series. Signatures: Sg.{Arthur F. Sidgreaves - MD} Date: 11/10/38 Hs.{Lord Ernest Hives - Chair} Date: 11/10/38 | ||