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).
Tolerances for ball bearings on the 3rd motion shaft of the 25 HP & Peregrine gearbox.
| Identifier | ExFiles\Box 104\4\ scan0164 | |
| Date | 1st September 1932 | |
| (X5310) BY.{R.W. Bailey - Chief Engineer} FROM HDY.{William Hardy} HDY{William Hardy}1/M6. 9.32. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} C. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} HS.{Lord Ernest Hives - Chair} RHC.{R. H. Coverley - Production Engineer} 25 HP. & PEREGRINE GEARBOX. X.5310. X.4027. R.{Sir Henry Royce} has remarked that instead of using the close limits of plus or minus 1/10/1000" on the 3rd. motion shaft for the ball bearings as shewn on G.55561, the inner bearing should be slightly larger in the bore, say 10/1000". We are aware that the need for this close tolerance arose through difficulty sometimes experienced with the ordinary 1/4/1000" limit in passing the inner bearing over the surface for the outer bearing, and we presume that the difficulty is accounted for by the necessity for selection of bearings to get the required tightness when a shaft limit of 1/4/1000" is used. HDY.{William Hardy} | ||