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).
Test results table for various large type rollers and bearings under different loads.
| Identifier | ExFiles\Box 153\1\ scan0279 | |
| Date | 20th April 1939 guessed | |
| E II CE TESTS ON LARGE TYPE STI I ROLLERS. Handwritten: Rocking Shaft Torque Load at 9.487. Speed = 450 R.P.M. on roller. Load measured normal to inner tooth surface. TABLE DATA: Row 1 Header: Type of bearing, Running time to Cause Failure, Nature of Failure. Row 2 Header: (Under Running time to Cause Failure) 1220 lbs., 2440 lbs., 3650 lbs., 4870 lbs. Handwritten under loads: 200 lbs, 400 lbs, 600 lbs, 800 lbs. Row 1: Type of bearing: 0.250 Balls. 0.187 Track rad. Adamant Grinding. Running time: 2 hours (at 1220 lbs), 19 mins (at 2440 lbs). Nature of Failure: Balls split. Inner track disintegrated. Row 2: Type of bearing: 0.187 Parallel Rollers. Adamant Manufacture. Running time: 2 hours (at 1220 lbs), 1hr.55mins (at 2440 lbs). Nature of Failure: Roller ends chipped. Inner track disintegrated. Row 3: Type of bearing: 0.250 Balls. 0.127 track rad. Chromesteel inner. R.{Sir Henry Royce} & M.{Mr Moon / Mr Moore} Grinding. Running time: 2 hours (at 1220 lbs), 2 hours (at 2440 lbs), 0 hrs. 25 mins (at 3650 lbs). Nature of Failure: Inner track disintegrated. Row 4: Type of bearing: 0.312 Balls. R.{Sir Henry Royce} & M.{Mr Moon / Mr Moore} Manufacture. Incorrect mounting. Running time: 2 hours (at 1220 lbs), 2 hours (at 2440 lbs), 1 hr. 10 mins (at 3650 lbs). Nature of Failure: lip of inner broken off. Row 5: Type of bearing: 0.312 Balls. R & M.{Mr Moon / Mr Moore} Manufacture. Correct Mounting. Running time: 2 hours (at 1220 lbs), 2 hours (at 2440 lbs), 2 hours (at 3650 lbs), 1 hour (at 4870 lbs). Nature of Failure: Outer cracked. Inner track disintegrated. Row 6: Type of bearing: Timken cone and roller assembly. D.A.4059. Running time: 2 hours (at 1220 lbs), 2 hours (at 2440 lbs), 10 mins (at 3650 lbs). Nature of Failure: Rollers crushed. Handwritten text at bottom: Hoffmann, 0.250 Balls. 2 hrs. 15 min. Ball split. 0.127 track rad. S/ZNX Inners. | ||