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).
Calculation example and notes regarding clutch plate settings, handling, and maintenance.
| Identifier | ExFiles\Box 93\3\ scan0358 | |
| Date | 18th August 1937 | |
| -2- Example 1. Assume plate thickness at rest..............410 2. Subtract cushioning........................050 ------- Compressed thicknean--- .360 3. Subtract thickness of setting plate-- .325 ------- Difference----------------- .035 4. Multiply by finger ratio----------- 5 ------- .175 5. Add .815--------------------------- .815 ------- .990 Note During July a very few Long plates of American manufacture were despatched, these have 9 springs instead of 6, and in these the cushioning is only .030, but with these a finger setting of 1.060 may still be used, as they are slightly thinner overall. We would particularly stress that the cushion plate is much more susceptible to damage in transit than the standard plate, and requires careful handling. If the run-out exceeds .015" it is desirable to reset them, otherwise the clutch may not stop. When resetting, always set the unspring or engine side first, taking great care not to crack the facing by bending the edges. Make sure that the Oilite bush in the trunnion sleeve is free and well oiled, as this feature is often responsible for a spinning clutch. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||