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 Lake & Elliot Ltd. regarding a safeguarding method for Millenite Drums.
| Identifier | ExFiles\Box 120\1\ scan0061 | |
| Date | 15th December 1931 | |
| COPY OF LETTER RECEIVED FROM :- LAKE & ELLIOT LIMITED, BRAINTREE, Ref. 1/T.4. 15th. December 1931. Messrs. Rolls Royce Ltd., D E R B Y. For the attention of Mr. R.W. Harvey Bailey. Dear Sirs, We are pleased to have received another small order for Millenite Drums from you, from which we presume that you are continuing your experiments with this material, which is proving eminently successful on heavy vehicles, and it has occurred to us that you might like to have particulars of a new development we have made in connection with it. This is a method of safeguarding which we have introduced for use in places where the metal is overstressed, as in the case of internal transmission drums on heavy vehicles, or where the minimum weight combined with the maximum security is required. The method consists of turning grooves in the flanges or cooling ribs of the Brake Drum and winding them with high tensile steel strip under tension. It is very cheap and simple to apply and the tests we have made seem to show that it affords absolute security in the event of a crack developing in the Millenite. We enclose herewith two photographs showing the outer rings of two Brake Drums of the same dimensions, one in solid Millenite and the other one safeguarded. They were pulled under the tensile testing machine until they cracked, both at about the same pressure namely - 10 tons, but whereas the solid Millenite would have been of no further use as a Brake Drum and would have fallen to pieces under the pressure of the Brake Shoes, the one that was safeguarded would still have retained its efficiency. | ||