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).
Lever test rig failure, where the case cracked and bearings seized due to a hollow shaft deforming.
| Identifier | ExFiles\Box 179b\3\ img076 | |
| Date | 30th January 1933 | |
| ORIGINAL: R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} C. Mor. Sg.{Arthur F. Sidgreaves - MD} C. Sy. Ndy. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}13/KT.30.1.33. x2235 With reference to Q1/M27.1.33. We shall have a rig running with an eccentric, to test the levers, almost immediately. In the meantime we have been using the Bumper chassis for the same purpose, with dampers set to 300 lbs. static load. With these loads we have cracked the case in two places, but the inside lever has not moved. Naturally we took particular care to tighten this lever properly before the test started. We found that when we exerted increased tension on the bolt holding this inside lever, we had cases of seizure on the two bearings. This occurred repeatedly. Investigation shewed that this was due to the hollow shaft becoming oval under the tightening grip to the extent of .001". Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||