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).
Meeting notes discussing design and manufacturing issues for various engine and steering components.
| Identifier | ExFiles\Box 18\6\ Scan031 | |
| Date | 6th September 1920 guessed | |
| - 2 - Lml/W9919 (Contd). number of pumps, and Mr. Swift would report when the original compression ratio and finer clearances could be again adopted, at the next Meeting. 5. E.17764 & E.17792. Aluminium Pistons. The Production drawing of the aluminium piston now quotes 3 tapers, that is one for the upper portion of the top band, another for the lower/tenth of the top band and the piston ring lands, and another for the fitting portion of the skirt. The two first mentioned tapers approximate to one taper and come in fact within the limits quoted to be indicated by a single taper. The Experimental Dept. recommended that these two tapers should in future be quoted as a single taper. This was agreed. 6. E.17764 & E.17792. Aluminium Pistons. The Production Dept. pointed out that the pistons, as being made, give a compression space of 24 +/- 1/8 c. ins. for high compression and 26 +/- 1/8 for low compression, while it has been understood that these compression spaces should be 23 1/2 and 25 1/2 respectively. It was felt generally that it was desirable to keep the compression ratio on the low side, and the figures now being worked to were agreed. 7. E.18063 & 4. Swan Neck Connection on Rear Silencer. Pipe Flange. E.18065. The Production Dept. pointed out that the present Swan Neck Connection is very difficult to manufacture owing to difficulty in obtaining steel casting of the right size which necessitates a considerable amount of awkward machining. They suggested that this present steel casting should be made in two halves of stampings welded together and that the Pipe Flange should, instead of being a stamping, be made of a pressing. After consideration it was thought that it would be better to attempt a re-design of these parts, for which purpose the matter should be put into the hands of Mr. Day, and a scheme prepared for submission to Mr. Royce. 8. Steering Column Box, Check Piece. T.2417. The Production Dept. had been informed that a considerable number of breakages of this part, which is made in aluminium, had occurred in America, and proposed that the piece should be made from Delta Metal. This was agreed. 9. F.4987 A & B. Inner and Outer Plug for Side Steering Tube. The Production Dept. reported that difficulty is experienced in the shop in drilling the hole through the plugs for the locking pins. These holes are dimensioned to run through the plug too closely to the bottom of the recess in the plug, with the result that the drills run out. It was agreed after discussion to recess the plug further, keeping the thickness of metal between the bottom of the recess and the spring abutments the same. This compressed the springs slightly more but this was considered to be, if anything, a desirable feature. 10. F.4989. Sliding Piece for Side Steering Tube. The tabs on P.T.O. | ||