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).
Technical document detailing noise testing procedures for gears and the manufacturing process for splines.
| Identifier | ExFiles\Box 174\2\ img069 | |
| Date | 27th March 1937 guessed | |
| -5- (5) Noise Tester. Photos 10 & 11 show a noise tester in which gears are mated prior to putting in a box. The operator judges the noise by ear, and notes the bedding by means of a red paste. (6) Splines. The tendency here seems to be to change to involute splines. The advantages claimed are :- (1) Fundamentally stronger spline form. (2) The broaches and cutters can in general be made more accurately and also more readily (quick using it). (3) Measurements can be checked more readily. The procedure is to broach and then when hardening the gear the bore is slightly hardened and finally the bore is rebroached, using a special hardened broach made from a 780 Brinell tool steel (photos 12, 13 & 14). When broaching helical splines the rig shown in photo 14 is used. It will be seen that the helix angle more or less looks after itself, being guided by the loose blocks shown to the left mounted above the work. More complicated machines were in use to maintain the proper helix angle, but the accuracy of this simple rig is, it is claimed, dependent only on the broach helix angle. Other broaching operations are shown in photos 15 to 21, while photos 22 to 26 show various lapping machines. It is recommended that every two years the lapping machines be reconditioned. To this end the machines are designed for ease of reconditioning. (note the 2 years will be years of continuous use). | ||