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 from Ransome & Marles Bearing Co. regarding the steering cam roller assembly, discussing torque and pre-loading.
| Identifier | ExFiles\Box 153\2\ scan0092 | |
| Date | 21th August 1936 | |
| X1300 London Office: 17, VICTORIA STREET, WESTMINSTER, S.W. 1. Telephone: ABBEY 3875 (2 LINES) Telegrams: OFFISLUNDA, SOWEST, LONDON BALL & ROLLER R&M BEARINGS Contractors to H.M.Admiralty, War Office, Air Ministry, Colonial Offices &c. Telegraphic Address: "BEARINGS, NEWARK" Telegraphic Code: BENTLEY'S Telephone Nos: NEWARK 456-457-458 RANSOME & MARLES BEARING Co., LTD., MANUFACTURERS OF BALL & ROLLER BEARINGS NEWARK ON TRENT. Branch Offices: LONDON, BIRMINGHAM, MANCHESTER, LEEDS, NOTTINGHAM AND- Branch Offices: SHEFFIELD, BRISTOL, GLASGOW, NEWCASTLE, DUBLIN, BELFAST. Our Ref. Tech.Dept. FOH/MB. Your Ref. Hs{Lord Ernest Hives - Chair}/FJH{Fred J. Hardy - Chief Dev. Engineer}/20/MA. F.J. HARDY Messrs. Rolls Royce, Limited, D E R B Y. 21st August, 1936. Dear Sirs, STEERING CAM ROLLER ASSEMBLY With reference to your valued communication of the 4th instant, together with your previous letter of the 14th ultimo, regarding the above, we note the details given on your latest drawings ref. F.61281/2/3/4/5/6, these being quite in order, and we note that you will be forwarding the parts in due course, for the grinding etc. as arranged. With regard to the question of the pre-loading on the balls, we are of the opinion that to make this to correspond to a torque of 2 to 3 lbs/ins. on the roller would constitute too great an interference and would possibly encourage indentation during the static loading, and we prefer to govern the pre-loading in terms of actual interference rather than in terms of torque. We are of the opinion therefore, that in adjusting the distance piece, an interference across the two balls of .002" nominal should be obtained, and we do not consider it advisable to exceed this very greatly owing to the possibility of static indentation mentioned above. In terms of torque this represents | ||