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 from Gleason Works responding to scoring troubles with hypoid gears.
| Identifier | ExFiles\Box 136\5\ scan0269 | |
| Date | 27th October 1930 | |
| COPY GLEASON WORKS 1000 University Avenue, Rochester, N.Y. U.S.A. Rolls-Royce Limited, Derby, England. October 27 1930. Gentlemen: Your reference BY5/G Attention Mr. R.{Sir Henry Royce} M.{Mr Moon / Mr Moore} Harvey Bailey. Your letter of October 15 is received, and we are surprised to learn of the scoring troubles you are having with hypoids. It is most unusual in view of the small proportional pinion offset when proportional offsets two to three times as great are operating in quantities and scoring is a very rare thing. If the gears and pinions are hard to file and are well mounted with good lubrication, your gears should operate entirely free from trouble. We feel there may be some one factor, aside from the method of hardening the pinion, that has escaped attention and we have accordingly instructed our Mr. Gray to visit you and thoroughly investigate the trouble from every angle. Mr. Gray is, of course, thoroughly conversant with hypoid manufacture and the standards of hardness we maintain, and it is quite probable he will locate the cause of these failures. We enclose copy of the heat treatment specifications we use on 5% nickel, double quenched pinions. There are no jigs used in quenching the pinion but we do handle each pinion separately and quenching it with its axis vertically to obtain a uniform quench. Mr. Gray will visit you within three weeks, and we believe the combination of your forces and our representative will readily find the trouble. Yours truly, GLEASON WORKS F.E.McMullen Mgh cc to Mr. Geo. Gray Fenwick, Paris. (Signed) F.E.MacMullen Chief Engineer-Gear Div. | ||