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).
Machining of the new Phantom clutch unit, detailing tolerances and issues with crankshaft flanges.
| Identifier | ExFiles\Box 66\4\ scan0032 | |
| Date | 27th October 1925 | |
| To EY from RHC.{R. H. Coverley - Production Engineer} C. Cpt. C. Hs.{Lord Ernest Hives - Chair} (8300) RHC{R. H. Coverley - Production Engineer}5/BE. 27.10.25. RE MACHINING OF NEW PHANTOM CLUTCH UNIT Hs{Lord Ernest Hives - Chair} has passed your note BY/16/H.{Arthur M. Hanbury - Head Complaints} 9.10.25. on to me. I have also read Mr. Swift's note on the above job and it would appear that the proposed method of machining Flywheels in position is the same as present practice. We have produced in the Experimental Department 6 complete Flywheel & Clutches as independent units and effected the necessary changeovers with Crankshafts in position and kept within the limits of .001 to .0015 out of truth on diameter and .002 on Clutch Faces. These would seem to be reasonable and permissable limits. The greatest difficulty appears to be in the machining of Crankshaft flanges which, in the final operation are ground on faces, and not only are they out of truth but also are not flat. Crankshafts in this condition prevent fitting of Clutches as complete units, and our experience is such, that providing Crankshaft flanges are perfectly true and perfectly flat ( the same applies to mating flange on flywheel) and reasonable care is taken -contd- | ||