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 report on the friction torque of shock damper inter-levers without keys.
| Identifier | ExFiles\Box 151\2\ scan0047 | |
| Date | 27th March 1933 | |
| 27.3.33. INTER. LEVER TESTS - SHOCK DAMPERS. Friction Torque - No Keys fitted. With the inter. lever secured to a shaft supported in ball race bearings, using F.58845 solid type biting-in-bolt, and the contact end of the lever rigidly fixed, torque was applied until the shaft slipped. Both lever and shaft were washed in petrol and dried before test, and the bolt tightened up until an elongation of .030" was obtained. STANDARD. F.59294. Final Torque 620 lb.ft. BY's F.100884. Final Torque 600 lb.ft. A different portion of the shaft was used for each inter. lever. The same two levers F.59294 (Standard) and F.100884 (By's) were re-tested on previously unused sections of the test shaft, using new F.58845 drilled bolts tightened until an elongation of .030" was produced. The Final Torque was 560 lb.ft. in each case. To find whether this decrease was due to the weaker bolt or to the fact that the same levers were used, the standard lever was re-fitted on the first used section of the shaft, secured by a fresh "solid" bolt. Again the Final Torque was 560 lb.ft. Choosing a previously unused portion of the shaft, a new "By" lever was tested with a new drilled bolt, this combination giving a Final Torque of 680 lb.ft. Then with a standard type lever .005" small in the bore, and using a drilled bolt with an elongation of .030" on a new section of the shaft the - Final Torque was 520 lb.ft. W. Bell. | ||