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 concerning a fracture in a 20 HP spring plate caused by deep stamping, requesting changes to marking procedures for suppliers.
| Identifier | ExFiles\Box 52\2\ Scan143 | |
| Date | 4th May 1927 | |
| RECEIVED 5 MAY 1927 X4429 c. Order Office. c. BY {R.W. Bailey - Chief Engineer} /HHB. c. HS. {Lord Ernest Hives - Chair} c. Mailing Dept. BY6/H. 4.5.27. May 4th, 1927. Wednesday. Messrs Thos. Firth & Sons, Norfolk Works, Sheffield. Dear Sirs, SPRINGS. ------- We have just broken the top plate on a 20 HP. spring in France. The fracture has taken place about 3/4" beyond the centre line of the spring and the line of the fracture coincides with the letter "J" stamped deeply into the plate. We were under the impression that we had previously arranged that the top plates should not be marked in any way by stamping. If it is necessary to mark the plate, then we suggest that very small letters indeed would be sufficient and that the marking should be comparatively close to the centre bolt so that it would fall inside the spring clips. We would like you to look into this matter and arrange, for all of our springs, that the top plate is marked as little as possible, that the marking shall be in small letters, and as indicated, inside the clip bolts. It is of course important that none of the plates should be deeply stamped or that large figures or letters should be used on any plate, as obviously such markings must result in stresses being set up at that point, and the risk of failure is very considerably increased. Yours faithfully, M Harvey Bailey TECHNICAL PRODUCTION ENGINEER. FOR ROLLS ROYCE LIMITED. | ||