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).
Methods for fitting the Phantom III connecting rod big end.
| Identifier | ExFiles\Box 93\1\ scan0135 | |
| Date | 2nd September 1937 | |
| [Handwritten top left, crossed out] RMOV HDS [Handwritten top left] Rm.{William Robotham - Chief Engineer} [Handwritten top center, blue] 314 [Typed top right] BY.3/G.2.9.37. [Handwritten top center, pink] Filer [Handwritten] Swell PHANTOM 111. CONNECTING ROD BIG END. [Handwritten] OK? Referring to the use of Hall's aluminium bearing metal, in conjunction with RR.56 shims to the big ends, with a predetermined nip, this can be done quite readily without having to resort to hand work on the shims.- (a). If we provide a hardened big end, which is the amount larger than the standard big end by the proposed 'nip', the half bushes could be finished to the level of the hardened bush, using the latter as a 'jig' or 'former'. The bush so prepared would then be fitted to its own big end 'nipped up' and reamed or diamond bored to size. I would suggest that a 'nip' of .0015 per side is desirable, and is a sufficiently large amount to be produced in the manner described regularly and easily. A gauge would have to be used in the production of the big end to get the depth within + 1/2. I would suggest a plate gauge, fitting on the flat surface of the big end located in the bolt holes by easy fitting short dowels with a vertical projection carried from same in/form of a .187 web, /the the width of the big end stopping short of the bored or turned face of the bearing by .125 a go and not go turned gauge. (b). Another method would be to fit the shells into a hardened piece, accurately produced to the big end dimensions, 3 or 4 shells could be fitted to one long housing of this type, a milling cutter would then be made up of two narrow cutters, say 1/8" wide each, a spacer between them and outside of each a hardened ground diameter .003 less in diameter than cutters. This tool would be fed in until the rollers met the hardened face which would then leave the .0015 on the face of the aluminium liner which is required. A similar procedure for the big end would be followed as in (a) above. BY.{R.W. Bailey - Chief Engineer} [Handwritten] BY | ||