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).
Recommended procedure for the re-tinning of Nitroalloy components.
| Identifier | ExFiles\Box 154a\1\ scan0149 | |
| Date | 3rd March 1929 | |
| Wor.{Arthur Wormald - General Works Manager} Hy.{Tom Haldenby - Plant Engineer} Sft.{Mr Swift} RHC.{R. H. Coverley - Production Engineer} C O P Y. Y4469 BY6/G21. 3. 29. NITROALLOY - RE TINNING OPERATION. X5010 (crossed out) X7010 I have before expressed the opinion that the best method of cleaning, fluxing and tinning is to :- a/ - Clean in a chemical colander. b/ - Dip crank in molten ammonium and zinc chloride of equal weight proportions and leave then until the crank or other part is up to correct tinning temperature and then immerse in tin bath. c/ - Dip in tin bath. I find that Messrs. Firth Derihons have tried this method successfully, and consider it is by far the cheapest and most effective method. Wor.{Arthur Wormald - General Works Manager} will remember I recommended the use of a chemical colander for tinning when I first reported, and have urged it since. I do not consider cranks should be hardened all over, as such a procedure is technically wrong. Only the journal and conn. rod bearing areas should be treated by hardening process. We are ordering up two each of SS.{S. Smith} and 20 HP. cranks in nitro alloy. I am definitely of the opinion that a chemical colander is the most efficient and economical method of dealing with the preparatory cleaning of the parts to be cadmium plated. BY.{R.W. Bailey - Chief Engineer} | ||