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 effectiveness of the 'Inco Lapping System' and experiments with a 'Michigan Tool Co's Gear Lapping Machine' for LaSalle gears.
| Identifier | ExFiles\Box 22\4\ Scan025 | |
| Date | 2nd April 1935 guessed | |
| -2- The "Inco Lapping System" is not as satisfactory as hoped for when put in use on LaSalle gears. This, however, I believe is largely due to narrow tooth faces. Our Methods Engineers are now experimenting with the Michigan Tool Co's Gear Lapping Machine. This machine has three large cast iron gears - friction loaded - and driven by the work gear, which also oscillates slowly across the lapping gears. In practice one of the three lapping gears is run on a different pitch centrex than the other two. This is done to eliminate some of the tendency of lapping above and below the pitch line. Some success has been experienced to date. Twenty-five more sets will be tried. In conclusion it is safe to say that there is as yet no one decidedly superior method for making quiet transmission gears. However I am certain that the Cadillac Motor Car Company is making the best two transmissions in the industry. The LaSalle practice is the most costly, but is also the best we know of to date. (Sgd.) E.{Mr Elliott - Chief Engineer} R.{Sir Henry Royce} Hyland. | ||