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).
Copy of a letter from Long Manufacturing to Borg & Beck detailing an investigation into a complaint about clutch components.
| Identifier | ExFiles\Box 130\3\ scan0196 | |
| Date | 6th March 1941 | |
| Sales:2/AMS/EFB P4.4.41 Copy for Copy of letter from: LONG MANUFACTURING DIVISION Borg-Warner Corporation. 12501 Dequindre Street, DETROIT. March 6, 1941 Borg & Beck Company Ltd., Tachbrook Road, Leamington Spa, Warwickshire, England. Re: Rolls-Royce Ltd. Gentlemen, Replying to yours of January 9th, we have carefully gone over the complaint made by Rolls-Royce Ltd. and have just completed an investigation of our own covering the points that they brought up. We enclose the following blue prints: CM-5163, C-5160, C-3496, C-5156, C-5158, C-4162, C-5161, C-5157 and C-3493, also a blue print of the centrifugal force curve for the Model 10CF lever. On a separate attached sheet we give the results of our investigation. Paragraph "A" - deflection of cover stamping due to spring load. This was done by taking a production stamping only, bolting it into a flywheel and measuring the height carefully at the three points above the release levers. Then, this stamping was assembled with 130# springs and together with a special driven member having a perfectly flat disc with the linings riveted tightly to this disc, was bolted back in the flywheel in the same position as originally. This caused a maximum bulge of .013 at one point. Paragraph "B" - the additional deflection due to centrifugal force, was measured by taking two production assemblies with 130# springs in them, assembling them to a heavy adapter plate, turning the plate upside down, supporting it on vertical blocks and placing it on the scale table. The release lever adjusting screws were put in the opposite way, then micrometer dial indicators were mounted so that they contacted the heads of the three cap screws. The load applied on the levers is in accordance with our actual findings on the centrifugal force developed by the release levers at various speeds and is shown on the inclosed curve. You will note that, at the equivalent of 4,000 R.P.M. with an additional load on the pressure plate of 1030#, the maximum additional bulge in the coverplate was .003. This check was made using the aforementioned solid driven member, and would indicate that the cover stamping is sufficiently stiff and the deflection is negligible. cont'd........ | ||