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).
Query regarding brake drum wear rates, final 'cut' dimensions, and scrapping limits for Phantom II and III models.
| Identifier | ExFiles\Box 120\1\ scan0241 | |
| Date | 3rd November 1937 | |
| File Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} 1028 BY.3/G.3.11.37. PHANTOM 11 and PHANTOM 111. RE: BRAKE DRUMS. I do not know the rate at which a brake drum wears, but I should have expected to be able to go beyond a "cut" of .025 as a final dimension. I appreciate you will have the same life after the "clean up" as before, but I should then assume worn size at which drum would be scrapped as .080 increase in diameter. The stiffness being mainly in the cooling fin dimension, I would have expected to wear up to .050 per side from original dimension before scrapping. Have you test figures to controvert this ? By BY.{R.W. Bailey - Chief Engineer} | ||