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).
Proposal to change materials for Phantom III Gear Box Gears to achieve cost savings.
| Identifier | ExFiles\Box 94\2\ scan0179 | |
| Date | 16th February 1937 | |
| To Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} from G/Rb.{R. Bowen} 328 G/Rh.{R. Hollingworth}1/K/72/C18237. Kidger Phantom III Gear Box Gears. Sec. 6040/50. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}9/AP.16.2.37. Referring to the proposal to replace certain gear box gears now made in S/ZNX (5% Nickel Case Hardened) by gear in S/ZNCR (Nickel Chrome) having soft splines heat treated to approximately 380 Brinell, we estimate a saving of 1/9d. per chassis. The gears in question are as follows:- G.81570 Constant Mesh Wheel. G.82925 Constant Mesh Pinion. G.81571 3rd. Speed Driving Gear. G.84315 3rd. Speed Driven Gear. G.82903 2nd. Speed Driving Gear. G.84800 2nd. Speed Driven Gear. We anticipate a saving in the assembly time by the deletion of the lapping of the gears on shafts, and this would amount to a saving in labour cost of 2/1½d.{John DeLooze - Company Secretary} which saving would be partly offset by the increased material cost, namely approximately 2/6d. The nett saving in direct expense would be as follows:- s. d.{John DeLooze - Company Secretary} Labour saving. 2 1½ Plus charges 100%. 2 1½ Saving. 4 3 Less increased material cost. 2 6 Nett saving per chassis. 1 9 We understand that the suggested change should considerably reduce the large amount of scrap at present obtained due to distortion in the bores as a result of hardening. G/Rb.{R. Bowen} Rook. | ||