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 heat treatment processes for connecting rods, with supporting hand-drawn sketches.
| Identifier | WestWitteringFiles\B\February1918\ Scan9 | |
| Date | 26th February 1918 | |
| -3- Re - Connecting Rods. was finally cut to length leaving perhaps enough for a final grinding before fitting the caps. A rough cut could then be taken through the bore with the stepped milling cutter, forming a rough outline of the bore for the bush. During this process the faces which fit the caps would be formed by straddle mills. The rod could then be turned over on to its edge and a stepped mill be used to form the fork roughly. Other rough milling could be performed and then the rod could be heat treated to give it the necessary strength and get the Brinnel high. We quite agree that any, and all of this work could be best performed while the forgings were in an annealed state which we think is best obtained by raising it to a fairly high normalised temperature and at once allowing it to cool slowly in a suitable medium, such as ashes, lime, etc, such that will prevent sudden or unequal cooling. This to be approved by Mr. Hall. [Handwritten Annotations] suitable clamping projections R.{Sir Henry Royce} spherical cylindrical longitudinal & little end equaliser bore Stepped Cutter more difficult to form approx cycle for fork these cut easily & quickly p.p. FHR | ||