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).
Problem with an overly strong spring in a distribution box cut-out and proposing spring steel as an alternative material.
| Identifier | ExFiles\Box 65\2\ scan0085 | |
| Date | 27th May 1925 | |
| X7740 To EFC. {E. Fowler Clarke - Electrical Engineer} BY {R.W. Bailey - Chief Engineer} /RD1/ML.27.5.25. 1 X.7740 - DISTRIBUTION BOX. X 4105 On further considering the rubbing or rolling action required on the cut-out contacts, I have discovered that the standard cut-out is not working as was originally intended, that is, when operating the tip of the spring carrying the upper contact should be lifted off the armature, as this does not take place, it is obvious that the spring is too strong. I therefore, suggested to Mr Brock that we should try a spring made from .004 Nickel Strip, that being the only material available in such fineness and that gave the rolling action required. I am now getting the O.O. to obtain 6 Springs in spring steel of a similar thickness, so that you may be able to test these out. I think steel will carry the current at this point and should be more consistent than the so called Spring Quality Phosphor Bronze which we are now using and which varies with each delivery. If this is successful it would be a very simple alteration to effect. You may have some suitable material in your Dept. from which you could make a spring and try in the meantime. BY {R.W. Bailey - Chief Engineer} /RD | ||