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).
Investigation into slack on indirect gears for Phantom III gearboxes.
| Identifier | ExFiles\Box 94\2\ scan0176 | |
| Date | 9th February 1937 | |
| 328 from Mx.{John H Maddocks - Chief Proving Officer} Mx{John H Maddocks - Chief Proving Officer}7/T9.2.37 Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls} PHANTOM III GEAR BOXES INVESTIGATION OF SLACK ON INDIRECT GEARS We have allocated two gear boxes for this investigation which is proceeding with all speed. We have just tried two recent production boxes which are unusually good for absence of slack on 3rd gear. This gear we consider is the most important one from a customers point of view, as it is frequently used in traffic. As a matter of interest, we have measured the "free" slack in these two boxes which is as follows:- Measured at 1.750 radius on 1st motion shaft with 1 1/4 lbs. loading at 7" radius, with the normal amount of Motorine 'G' in gear box and box cold. Gear Box No. G-38-V Top Gear .009 ) 3rd Gear .030 } 3rd Motion shaft stationary. 2nd Gear .049 ) Gear Box No.X-58-E Top Gear .007 ) 3rd Gear .023 } 3rd Motion Shaft stationary. 2nd Gear .042 ) Gear Boxes which are unsatisfactory have approximately .075 slack on 3rd gear. The two boxes which are having Experimental investigation were in this category. Mx{John H Maddocks - Chief Proving Officer} | ||