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).
Visits to suppliers to assess their capability of manufacturing a helical reverse gear for the B.V. gearbox.
| Identifier | ExFiles\Box 99\4\ scan0185 | |
| Date | 4th February 1939 | |
| 428 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}3/MH.{M. Huckerby}4.2.39. B.V.GEARBOX. We have visited Messrs. David Brown and Messrs. Humber Motors to ascertain whether they would be able to cut the helical reverse gear on the proposed B.V. 2nd. motion shaft to GB.4616. Messrs. David Brown were just able to cut the teeth on a wooden model we took with us. The machine used was a Parkinson rack type shaper made by the Sunderland Co. The process was, however, slow owing to the narrow gap of 0.275 between the gear concerned and the adjacent overdrive gear which necessitated a large number of shallow cuts. If the gap is increased to 0.815, which our design will permit, the process becomes quite practical and could probably be completed in three roughing and one finishing cuts. Messrs. Humber demonstrated to us that the gear could be cut on either the Fellows shaper or the standard Maxicut shaper. On both machines the head would be raised by a packing block at the junction of the head and base of the machine, the cutter would be sufficiently large in diameter to make the spindle and head of the machine clear the other gears on the shaft and the upper end of the shaft would be supported by a steady post. With the original 0.275 gap the machines would be made to cut on the up stroke. If the gap is 0.815 the cutter can be made narrower than the gap and the machines can then cut on the down stroke in the usual way. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||