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).
Suggestion to modify the ball arrangement in the Bentley III and B.50 Servo to prevent shaft grooving.
| Identifier | ExFiles\Box 99\3\ scan0184 | |
| Date | 29th September 1938 | |
| To By/Ald.{F. Allwood - Experimental Design} c. to By.{R.W. Bailey - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to H.M. 441 also 841. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}2/JH..29.9.38. Bentley III and B.50 Servo. A suggestion was put forward to delete the centre row of balls in the aluminium cage which supports the friction plate in the Bentley III servo. After short period of running we have found slight groving on the shaft and accordingly do not wish to reduce the number of balls. On the other hand we should like to have a cage drawn having the same number of balls arranged in a spiral or each row of 3 staggered so that they form a different line of contact on the shaft. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems} | ||