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).
Endurance tests conducted on large type steering rollers at different loads.
| Identifier | ExFiles\Box 95\1\ scan0420 | |
| Date | 5th August 1937 guessed | |
| ENDURANCE TESTS ON LARGE TYPE STEERING ROLLERS. 350 Speed = 450 R.P.M. on roller. Load measured normal to inner tooth surface. type of bearing. Running time to cause failure. 1220 lbs. 2440 lbs. 3650 lbs. 4870 lbs. Nature of failure. 0.250 Balls. 0.187 Track rad. Adamant Grinding. 2 hours. 19 mins. Balls split, Inner track disintegrated. 0.187 Parallel rollers. Adamant Manufacture. 2 hours. 1hr.55mins. Roller ends chipped. Inner track disintegrated. 0.250 balls. 0.127 track rad. Chrome steel inner. R.{Sir Henry Royce} & M.{Mr Moon / Mr Moore} Grinding. 2 hours. 2 hours. 0 hrs. 25 mins. Inner track disintegrated. 0.312 balls. R & M.{Mr Moon / Mr Moore} Manufacture. Incorrect mounting. 2 hours. 2 hours. 1 hr. 10 mins. Lip of inner broken off. 0.312 Balls. R.{Sir Henry Royce} & M.{Mr Moon / Mr Moore} Manufacture. Correct Mounting. 2 hours. 2 hours. 2 hours. 1 hour. Outer cracked. Inner track disintegrated. Timken cone and roller assembly. N.A.4059 2 hours. 2 hours. 10 mins. Rollers crushed. Hoffmann 0.250 balls. 0.127 track rad. S/ZNX. inners. 2 hours. 15 mins. Ball split. | ||