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 parts for a pinion bearing with specific preload and cage hole elongation.
| Identifier | ExFiles\Box 171\5\ img054 | |
| Date | 8th September 1938 | |
| RR 755B (10H) (49968) 19/10/37 C.E.Co. BENTLEY STANDARDISATION OF PARTS Date Issued 8.9.38. Sheet No. B.17. Drg. No. GB.4080. L.O.P.S. Description: Pinion bearing with .002 - .003 preload and .025 elongation of holes in the cages. Purpose: To reduce service complaint of loss of preload and to prevent cage failure. Brief Report and Remarks: Successfully completed 30 hours on 3rd. gear on dynamometer which is more than the standard bearing will do. Has run 500 hours on rig test at Ransome & Marles. 2,000 cars in the hands of customers are potential cases of this axle trouble. By trying the improved bearing which can be no worse, in the last half of 'M' series we may get proof that we have found a satisfactory way of dealing with service complaints which total over 100 per year. When recommended for Introduction: 101 in M.{Mr Moon / Mr Moore} Report References: Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}1/R.5.9.38. By Rm{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design} Mx{John H Maddocks - Chief Proving Officer}: BY.{R.W. Bailey - Chief Engineer} Gry.{Shadwell Grylls} Da.{Bernard Day - Chassis Design} Mx.{John H Maddocks - Chief Proving Officer} (Rm{William Robotham - Chief Engineer} absent Old Parts: Material £1.1.6. Labour Bought Outside Total £1.1.6. New Parts: Material £1.9.9. Total £1.9.9. Increase in Cost £0.8.3. G/L 30/9/38 Production Position and Comments: Cost of Tools £ NIL. Modified pinion bearing to maintain preload and prevent cage failure can be introduced without scrap at the 78th. chassis in 'm' Series. No tool cost is involved but the factory cost is increased by 8/3d. per chassis. RHC.{R. H. Coverley - Production Engineer} Authorisation to Proceed. Introduce on the 78 Chassis in M Series. Sg.{Arthur F. Sidgreaves - MD} Signature Date 11/10/38 Hs.{Lord Ernest Hives - Chair} Signature Date 11/10/38 | ||