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).
Letter with a sketch explaining the necessity of spherical seatings for bolts and pins to avoid stress failure.
| Identifier | ExFiles\Box 181\M7\ img009 | |
| Date | 22th September 1930 | |
| REG. TELEGRAPHIC ADDRESS: "ROYCE, WEST WITTERINGHenry Royce's home town." } TWO WORDS ONLY. TELEPHONE: CHICHESTER 210. STATION - PASSENGER & GOODS: CHICHESTER - 7 MILES. SOUTHERN RLY. "ELMSTEADHenry Royce's home in West Wittering," WEST WITTERINGHenry Royce's home town, NR. CHICHESTER. 22nd. Sept. 1930. Copy to Mr. Claremont. " Mr. Halley. " Mr. Allcock. " Mr. Rushton. Mr. J.{Mr Johnson W.M.} C. Bentley. ROYCE LTD. MANCHESTER. Dear Mr. Bentley, All important bolts or pins, shanks of hooks lifting or shanks of supporting links, must have spherical or other provision for swivel seatings, so that there is no fear of out of centre loading causing combined tension and bending, such as may occur if the load could get to the outer edgeof the nut, in which case our estimate is that the maximum skin stress at the bottom of the thread is 9 times greater than if the stress were uniform over the section - i.e. free from eccentric loading or bending. Omission of this precaution may result in unaccountable failure. (See sketch below.) Yours faithfully, F.H. Royce [Text from sketch] This side when required to swivel Casehardened seating washer diametrally free. This ball race should fit stem closely but not tightly. This side when not required to swivel, also requires seating washer to be diametrally free. | ||