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).
List of casting errors for a Main Lever Housing from Jessop's.
| Identifier | ExFiles\Box 142\4\ scan0089 | |
| Date | 2nd April 1938 guessed | |
| GW.1747 MAIN LEVER HOUSING - EX JESSOP'S. Casting submitted shows the following errors :- The inclination of the arm to the main body of the casting is 23½° instead of 22½°, which throws all bosses on the arm considerably out of position. The .750 diameter boss on the top of the casting has been made 1.150 diameter, and there is no machining allowance on the 1.700 height of boss. The .300 thickness of the two .650 square flange farthest from the arm is -.050, and the two .250 radii on outer corners of same flange are -.050 to .150. There is .050 shortage of metal on the uppermost .350 radius of rectangular flange on the side of the housing remote from the arm. There is a .025 to .030 shortage of metal around the two uppermost stud bosses on the large facing (3.925 centres). The 3.125 diameter behind the bottom circular flange (section DD) is -.075 to .100 on radius at the point where the arm merges into the main housing. The 4.350 diameter bottom facing is .061 short of metal locally on the periphery of the flange, which is also -.035 to .075 on the unmachined side. Five of the 2.000 diameter scallops in the large circular flange are +.050 to .075 on radius, thus reducing the width of the joint facing. There is no machining allowance in the 4.750 diameter bore of the scalloped facing. ---------------- | ||