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).
The process and machinery for cutting and finishing gears and pinions using spherical cutters.
| Identifier | ExFiles\Box 136\5\ scan0134 | |
| Date | 6th October 1926 guessed | |
| which have the offset position of the spindles. This can be accomplished for the present by the use of riser plates. In cutting new cutters are required, and new or altered machines for the pinion finishing operation. The spherical cutters used will be of the same general form as the well known face mill type used for producing spiral bevel gears, but the blade shape is changed from straight to curved sides. The use of the spherical cutter makes possible a theoretical matching of tooth surfaces. Nine inch cutters are being used in all cases but the spherical nature of the cutter makes possible a theoretical matching of the tooth surfaces both for length and for profile. In fact, it has been found advisable in practice to modify the cutters slightly from theoretical design, because the matching has proved to be too close without such modification. This applies equally to long face, coarse pitch jobs. The rough cutting of gears and pinions will be done on the present roughing machines. The gears will be finish generated on the present spiral bevel gear generators, using the new spherical cutters. The finish cutting of pinions will be done on a machine similar, in general, to the present Gleason 15" Spiral Bevel Gear Generator, but having two additional angular adjustments on the cutter to take care of the spherical nature of the cutter, and an additional vertical adjustment of the work head to provide for the offset position of the pinion. These alterations can be made on existing spiral generators, or new machines can be provided. -4- Gleason Works - Rochester, N.Y. | ||