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).
Moulding processes and materials such as Beldalite, ebonite, and Bakelite.
| Identifier | ExFiles\Box 39\3\ Scan028 | |
| Date | 15th March 1921 | |
| Contd. -2- Hsl/LG15.3.21. they remove it from the die after 35 minutes baking, is so as to reduce the number of dies required. The material has set by that time and can be finished baking without being in the die. We appear to have all the necessary plant at the works for doing our own moulding in Beldalite. The only things which we require are the dies. The material as it leaves the die has a rough finish. The Watford high tension distributors are machined all over. They say that the material is not bad to machine as long as a fairly decent cut is taken. With a fine cut the edge of the tool is rubbed away. For a fine cut, it is necessary to use a diamond. It is not possible to mould this material very accurately to size as it contracts in the dies. Practically the same process is used for moulding black ebonite. They procure the raw material from he rubber companies. They mould it themselves. They say it is necessary in the case of ebonite to extrude the material into a die. It does not make a good job if borken pieces are used. With ebonite they say they have not been able to get a good finish from the die. In their case they machine all the ebonite pieces. Where accurate dimensions are required, they grind the ebonite. We asked them about Bakelite. They said they did not know of any Firm in England which was producing this material. The Watford people, although they have only a small wroks, have very up-to-date equipment. Contd. | ||