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).
Letter from Templewood Engineering Co. Ltd. proposing a scheme for developing light alloy brake drums.
| Identifier | ExFiles\Box 170\1\ img017 | |
| Date | 30th June 1938 | |
| 1028 Telephone: SLOUGH 22048 DIRECTORS: S. SANDERS S. S. TRESILIAN, B.A., A.M.I.A.E., M.S.A.E., M.A.S.M.E. A.{Mr Adams} C. BERTELLI (Formerly Italian) L. JACKSON TEMPLEWOOD ENGINEERING CO. LTD., 490, IPSWICH ROAD, TRADING ESTATE, SLOUGH, BUCKS. 30th. June 1938. S. H.{Arthur M. Hanbury - Head Complaints} Grylls, Esq., Rolls-Royce, Ltd., DERBY. Dear Gry{Shadwell Grylls}, When you have recovered from the delicate snippets-egg blue of our correspondence, we would like to know whether you are still interested in light alloy brake drums. We have a scheme which you might think worth trying out. You may remember that the Mercedes cars which came up to Donnington, claim to have the only successful composite drums in which the liners didn't come loose, and refused to disclose the process. There are in existence various aluminium solders, some of which have a melting point as high as 500/600°C., and will stick steel to aluminium with the greatest of ease. We think it might be worth trying to tin the liner before squeezing it into the light alloy drum, or alternatively to tin the liner and cast the drum on to it. There is a possibility that if one was not dependent on the maintenance of a shrink fit, it might be possible to make a success of light alloy drums this way. Anyway, H.D.A. are willing to carry out a number of experiments, given some sample drums. If you would care to send us detail drawings, or sample liners in high carbon steel, cast iron, or any other material you think suitable, our people are willing to try experiments either by shrinking on the normal light alloy ribbed drum or by mounting the liner in the sand and casting the drum on to it. It seems to me that in a case like this, one would probably prefer to make the liner a little thicker than you were accustomed to in your previous efforts at light alloy drums, to try and prevent distortion. The only fear we have is of the fatigue strength of the solder layer which I believe is not very high, but in a case like this, it could not Cont'd ... ... ... ... - 1 - | ||