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).
The design and manufacturing process for leaf springs, including diagrams of the leaf ends.
| Identifier | ExFiles\Box 43\2\ Scan204 | |
| Date | 28th September 1937 guessed | |
| - 9 - APPROX .010" The tapered portion at the end has been made tangential to the curve in forming the leaf thus:- [Diagram 1 Labels] TAPER RADIUS TANGENT About 2" RAD. CURVE ON END [Diagram 2 Labels] TAPERED BACK OF LEAF APPROACH CURVE TANGENT RADIUS This has avoided gaping at the ends. Making the Springs. The top plate of the front spring is machined all over, including the edges from a forging. .100 of metal is removed all over. It is polished after hardening. All leaves are ground to remove roughness in the bedding faces, and polished all over the outside. We do not paint springs, as the coachbuilders remove the paint before applying their own color, and the paint-remover rusts the joint faces. Springs are lubricated with graphite grease and covered with a rust-proofing grease on chassis. When body is fitted, gaiters are applied which have felt liners soaked in engine oil. | ||