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 Graham-Paige Motors Corporation regarding cone worm gear design and crankshaft characteristics.
| Identifier | ExFiles\Box 173\3\ img188 | |
| Date | 24th April 1934 | |
| GRAHAM-PAIGE MOTORS CORPORATION DETROIT, MICHIGAN [Handwritten Note] Gry.{Shadwell Grylls} Can you let me have Carters formula to pass on to Mr Thoms Rm{William Robotham - Chief Engineer} April 24, 1934. Rolls-Royce, Ltd., Derby, England. Gentlemen: Attention: Mr. W. A.{Mr Adams} Robotham. Our experience to date is that the only satisfactory gears are those we are now using. They are known as cone worm design and are manufactured at the present time by the Michigan Tool Company of Detroit, Michigan. This is a patented gear design, but it has been our experience that the above company is very reasonable with their royalty charges. The reason that we believe that these gears stand up so well is that they have quite a large surface of contact, so that the unit pressures on the teeth are very low, which seems to be essential for these high rubbing speeds. We appreciate your interest in our product and appreciate your purchase of one of our cars and hope it will meet with your expectations. We have had an opportunity to check our 6 cylinder crankshaft with the 12 counterweights and find as you predicted we run into a torsional period at about 5000 RPMs, but it is not extremely violent and we are convinced that we can dampen it out to a satisfactory degree. Our chief engineer, Mr. Thoms, whom you met here, has suggested that I request of you any data you would care to give us relative to your method of computing these crankshaft characteristics. We are interested in your statement that you had been able to use such a method. Thanking you in advance and hoping you will be good enough to let us have your comments on the car, we are, Very truly yours, F.F. Kishline F.{Mr Friese} F.{Mr Friese} Kishline Assistant Chief Engineer. h | ||