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).
Technical drawing for a section of steel for bumpers, with material specifications and heat treatment instructions.
| Identifier | ExFiles\Box 118\2\ scan0189 | |
| Date | 4th September 1934 | |
| X4522 5203 3/32" R 1/8" R 1/2" : 1 1 1/2" : 1 3/32" R .1275" / .1125" 1/16" 6 3/4" R.{Sir Henry Royce} Surface must be free from pits scale & roll marks must polish and take nickel plate. Brinell 255 max. MANUFACTURING NOTES FINISH G.{Mr Griffiths - Chief Accountant / Mr Gnapp} GRIND F.{Mr Friese} MACHINE P. PLANISH L. LINISH D.{John DeLooze - Company Secretary} FILE R.{Sir Henry Royce} ROUGH REPORT ALL CHANGES AND ERRORS TO DRAWING OFFICE. CUSTOMERS NUMBERS WORK ONLY TO FIGURED DIMENSIONS. DO NOT SCALE. MATERIAL: H.R. Steel ANALYSIS: Carbon .65 - .75% Mang. .50 - .70% Silicon. .10 - .20% Sulph. .04% Max. Phos. .03% Max. MATERIAL TOLERANCE HEAT TREAT: Heat to 1480°F.{Mr Friese} Quench in oil. Draw at about 700°F.{Mr Friese} Brinell 340-387 after manf FINISH MATERIAL SIZE: .1275" / .1125" X WILMOT-BREEDEN LTD BIRMINGHAM SECTION STEEL FOR BUMPERS DRG. No. F.M.442/2 SCALE: 1/1 DATE: 27.4.33 Redrawn 4.9.34. MODEL: Ford B.P. "Y" 1934 No. REQ'D: 2 DR: B CH: L.M.B. TR{Capt. F. W. Turner - Finance}: L.M.B. CH: T.H.M. Tolerance on all Dimensions is ± .010" Unless Otherwise Specified. REVISIONS No. 1 DATE: 5.9.33 WAS: .125-.115 SIGN: LMB No. 2 DATE: 4.9.34 WAS: Centre radii changed. SIGN: MM | ||