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).
The difficulties of fitting taper bolts for rubber engine feet and a proposed improvement.
| Identifier | ExFiles\Box 14\5\ Scan035 | |
| Date | 18th December 1928 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from E.{Mr Elliott - Chief Engineer} X. 7005 c. to R.{Sir Henry Royce} BJ. BY.{R.W. Bailey - Chief Engineer} E1/M18.12.28. RUBBER ENGINE FEET. In reply to Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG12.12.28., there are certain difficulties in the way of obtaining a good fit with taper bolts on the above job. The spring steel tempered plates are hard to ream and the bolt holes are so long from top to bottom that the tapers are unlikely to match the bolts. Because of this, and for the sake of simplicity, an ordinary reamed parallel fit was indicated in the first place for this job, and not with a view to allowing the frame to 'breathe'. If the Production Dept. can provide a taper bolt fit at the points in question we agree it should be an improvement. We propose to get out a scheme for using a taper at the top end of bolt and taper ferrule incorporated with washer at bottom end of bolt. The bolt can be driven up and the ferrule can be driven down when easing foot for removing engine. E.{Mr Elliott - Chief Engineer} | ||