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 machining and forging process for connecting rods.
| Identifier | WestWitteringFiles\B\February1918\ Scan8 | |
| Date | 26th February 1918 | |
| -2- Re - Connecting Rods. this process, but leaving enough on for a decent facing when the other side is machined. These two bores and facings will be the correct distance apart and will form the basis for all future machining. We look upon starting the job as the most important of all, because if the first jig is incorrect, later processes will never be satisfactory. To continue with the large central rod we come to the conclusion it would be better in this case to forge the cap with it, but before drilling the rod for the bolt holes the cap would be cut off with a saw of a satisfactory thickness so that it will not run excessively. After this, it is suggested that, both the cap and the rod sawn faces shall be ground square with the originally turned face mentioned above. They could then fit a drilling jig, being forced upwards against these ground faces and sideways against the datum face just mentioned. The drilling would then come out exactly true with the ground and turned faces in the rod and in the cap, and with the ordinary care of arranging the jig the two should match, so that only a final reamering will be required. They should also be free from any spring or distortion. Regarding the forked rod, it was assumed that the big end of this would be forged solid but without the caps which could be forged in pairs or separately, as found convenient. The first process with the rod suggests that the end faces were straddle milled after which the bottom face | ||