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).
Difficulties in photographing and preparing worn cylinder block specimens for analysis.
| Identifier | ExFiles\Box 132\5\ scan0151 | |
| Date | 17th October 1940 | |
| 1123 Rm.{William Robotham - Chief Engineer} H1./EJW. 1/JM.{Mr Morley} 17.10.40. Laboratory. c. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} c. H1./GLT. c. H1./EA. Cyl. bore wear (Chassis) CYLINDER BLOCKS. Ref: Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}2/ET. 11.10.40. The maximum magnification which we could use to cover a section of 1.500 ins. length in a single photograph would be 4 diameters. This is not adequate to demonstrate the characteristic shape of the worn portion which is relatively shallow and must taper very gradually in the least worn portion if it extends over 1.500 ins. We have considered the possibility of making a projection drawing or composite photograph. These would require special arrangements and take a considerable time. Apart from this however the result would be an illustration so elongated as to be of little practical value. If it would be of any use to take a photograph at say 10 or 20 diameters of the deepest part of the worn portion only, we could do this. It should be noted however that the preparation of the specimen will require a considerable amount of machining with which H1./GLT is unable to deal, and which will therefore have to be done in the Works. The chromium plated blocks are particularly difficult as the sections have to be cut on a grinder with a slitting wheel, and even when this is done there is a pronounced tendency for the chromium to break up. It is possible that H1./EA. may be able to superimpose a layer of a tougher metal to support the chromium. Please let me know if you wish us to proceed on the lines suggested or not. H1./EJW. | ||