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).
Blueprint specifications for a Valve Spring for a Cylinder Block.
| Identifier | ExFiles\Box 126\2\ scan0041 | |
| Date | 19th June 1935 | |
| MODIFICATIONS SHEET DATE SGN LENGTHENED 1m/m, SCHEDULE 4955 12.12.30 AA{D. Abbot-Anderson} 50+/-7 LBS To 50+/-9 LBS 19.6.35 BT{Capt. J. S. Burt - Engineer} Handwritten notes: Stress closed 46.5 open 75.0 due 87.5 C=6.95 1C=12.23 due length d^2=.691 Mean dia .885 it into 8 1/2 d^3=.00246, d^4=.000330 Table: SECTION OF WIRE: 0.135" No OF FREE COILS: 7 * INTERNAL DIA: 19 m/m .750 n * RATE: 99 LBS. PER INCH 91.6 FREE LENGTH: 55 m/m 2.170 FITTED LENGTH: 42 m/m 1.655 * TO EXERT 50 +/- 9 LBS AT 42 m/m TO WORK SAFELY AT 34 m/m fs{F. Steele} = 79,200 LBS PER SQ. INCH 1.340 * SOLID LENGTH NOT TO EXCEED 30.5 m/m fs{F. Steele} = 87,500 LBS PER SQ. INCH 1.203 HAND OF SPIRAL: UNIMPORTANT FINISH: NATURAL * IMPORTANT Handwritten notes (circled): set of head 47.2 stress 52.4 open 76.1 85.3 due 98.7 99.4 Handwritten notes (boxed): 830 HILLMAN 12HP Stamp: HUMBER HILLMAN 26 JUN 1936 COVENTRY Title Block: DRAWN TRACED: DL.N 12.12.30 CHECKED: G 12.12.30 PASSED SPEC. 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 WEIGHT: LBS OZ ROUGH FINISH MATERIAL: STEEL SPEC. AERO QUALITY FORM: FIN SECTION LENGTH COMPNT: CYLINDER BLOCK PART: VALVE SPRING NUMBER: P35762 A | ||