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).
Design drawing for a valve spring for a cylinder block.
| Identifier | ExFiles\Box 126\2\ scan0042 | |
| Date | 20th June 1935 | |
| MODIFICATIONS SHEET TOLERANCE: ± 7 LBS To ± 7 LBS.: 5365, DATE 28.2.35, SGN R.P. J.Q. Handwritten notes: Stars closed 60.8, open 85.7, close. 96.6 SECTION OF WIRE: 0.199" (9 S.W.G.) NO. OF FREE COILS: 6 1/2 * RATE: 92 LBS. PER INCH * INTERNAL DIA: 22 M/M FREE LENGTH: 63 M/M FITTED LENGTH: 93.5 M/M * TO EXERT 71 +/- 4 LBS AT 93.5 M/M TO WORK SAFELY AT 35.5 M/M fs{F. Steele} = 86,000 LBS PER SQ INCH SOLID LENGTH NOT TO EXCEED 32 M/M fs{F. Steele} = 96,600 LBS PER SQ INCH HAND OF SPIRAL: UNIMPORTANT FINISH: NATURAL * IMPORTANT Handwritten: 1936 HUMBER HILLMAN DRAWN: T TRACED: W.B 20.6.35 CHECKED: G.W 21.6.35 PASSED SPEC_n 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 HEAT TREATMENT: AS DELIVERED WEIGHT LBS OZ MATERIAL: STEEL QUALITY FIN COMP_NT: CYLINDER BLOCK PART: VALVE SPRING NUMBER: P39567 A Stamp: HUMBER HILLMAN 26 JUN 1938 | ||