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).
Drawing and specifications for a valve spring for a cylinder block.
| Identifier | ExFiles\Box 126\2\ scan0045 | |
| Date | 30th August 1936 | |
| MODIFICATIONS SHEET DATE SGN SK.20794 Handwritten notes: wires - closed No.1, lifters 700B, dim 93.5 Handwritten note: OS & B.30 SPECIFICATION TABLE: SECTION OF WIRE: 0.120" Nº OF FREE COILS: 7 INTERNAL DIA: 19 M/M RATE: 64.5 LBS PER INCH FREE LENGTH: 55.7 M/M FITTED LENGTH: 42 M/M TO EXERT: 35.9 LBS AT 42 M/M TO WORK SAFELY AT 34 M/M fs{F. Steele}=70,600 LBS PER SQ INCH SOLID LENGTH NOT TO EXCEED 27.4 M/M fs{F. Steele}=92500 LBS. PER SQ. INCH HAND OF SPIRAL: UNIMPORTANT FINISH: NATURAL *IMPORTANT TITLE BLOCK: COMPNT: CYLINDER BLOCK. PART: VALVE SPRING NUMBER: SK.21652 STEEL: AERO. QUALITY FIN. DRAWN: TRACED: B 30/8/36 CHECKED: PASSED: SPECº: NOTE: ALL UNLIMITED MACHINING DIMENSIONS TO BE WITHIN +.200 M/M --.200 M/M f: MACHINED FINISH H: HARDENED G: GROUND MACHINE ALL OVER m: ROUGH MACHINE FINISH HEAT TREATMENT: AS DELIVERED ROUGH FINISH MATERIAL: SPECn, FORM, SECTION, LENGTH STAMP: HUMBER HILLMAN, 27 JUN 1936, COVENTRY | ||