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).
Tests conducted on the 'INDIA' gearbox to resolve issues with the 1st speed gear.
| Identifier | ExFiles\Box 6\4\ 04-page109 | |
| Date | 30th March 1925 | |
| EXPERIMENTAL REPORT. Exptl. No. 15310 REF.HS{Lord Ernest Hives - Chair}4/LG30.3.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to RG.{Mr Rowledge} AJS. c. to HY.{Tom Haldenby - Plant Engineer} Wor.{Arthur Wormald - General Works Manager} S E C R E T. 'INDIA' GEARBOX. We have run further tests with the gearbox in which the section has been cut away so that we can actually watch the 1st. speed work out. All our tests so far have been carried out with the original size of pinions. Those one tooth larger are not yet available. We fitted two new 1st. speed gears and we found that the 1st. speed worked out; it worked out which ever way the pinion was put on the shaft. We then ground the bore of the pinion .003" taper - the bore is 1.50" in length. We found when we fitted this pinion on with the larger end of the bore towards the front of the gearbox, there was no sign of the 1st. speed working out. If we reversed it, the gear still continued to work out but it did not appear to be any worse than it was before. We then took another pinion which had been noticeably bad for working out and carried out the same modification. We obtain the same results i.e. with the large end of the taper towards the front end of the box, there was no tendency for the gear to work out. We then took this same pinion and ground it out parallel again, this meant that it was .003" larger than the standard size. The pinion then commenced to work out which ever way it was fitted. These tests were carried out on a light rig with rather light torques passing through the gears. contd :- | ||