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).
Manufacturing and heat treatment instructions for 'F' type cylinders in nitro alloy steel.
| Identifier | ExFiles\Box 154a\1\ scan0124 | |
| Date | 4th December 1928 | |
| COPY RHC.{R. H. Coverley - Production Engineer} BY10/G.4.12.28. c.Ws. c.Mr. Pendlebury. 'F' TYPE CYLINDERS IN NITRO ALLOY STEEL. Referring to the cylinder forgings which have been received in the above material, the handling of same should be in accordance with the following instructions:- 1/- Rough machine all over leaving .4" on diameter, both inside and outside, and .125" at each end. 2/- Heat treat. The heat treatment in question being 880°/900°C, and tempered at 750°C, and should be maintained at this temperature for 45 minutes. 3/- Machine to within 1 m/m of finished dimensions all over. This 1 m/m.{Mr Moon / Mr Moore} being per side, i.e. 2 m/m.{Mr Moon / Mr Moore} on diameter. 4/- Anneal at 550°C for three hours. 5/- Machine to size on the outside diameter and ends where not required to be hard. 6/- Tin. The tinning is done by submerging in a bath of 50/50 lead tin solder. The full operations are given in BY14/G.19.11.28., and this method of cleaning and tinning must be strictly adhered to. 7/- Remove all traces of tin by scrubbing with a wire brush. 8/- Finish to final sizes, making the bore of the cylinder .002" over the standard 5" dimension. 9/- Send away for nitrogen treatment. 10/- When the cylinders have been hardened and returned I wish to examine them, as it seems possible to me that they would be useable as received by merely polishing out with very fine emery. If, however, the cylinders have contracted or are seriously out of truth then they will have to be ground to size. Information in regard to the grinding wheels will be furnished if I find it necessary. BY.{R.W. Bailey - Chief Engineer} | ||