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).
Proposal to change the treatment of sand castings from linseed oil to cellulose paint for all chassis.
| Identifier | ExFiles\Box 148\2\ scan0001 | |
| Date | 6th October 1938 | |
| 1260 To Mr. [redacted] & Rm.{William Robotham - Chief Engineer}.....From Mr. [redacted] RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister}1/MC.6.10.38. [Handwritten]: Files [Handwritten]: Swell. Have we any experience of this? Rm{William Robotham - Chief Engineer} TREATMENT OF SAND CASTINGS - ALL CHASSIS Chassis crankcases and other large castings are at present treated internally by spraying with linseed oil and afterwards baking, the object of this treatment being to seal the pores in order to retain any loose fragments of sand. An alternative and more economical method used by many manufacturers is to spray the details with oil resisting cellulose paint, the principal advantages of this practice being that operating times are reduced, and the baking process entirely eliminated. Comparative cost figures are given on the attached sheet for both processes, and it will be observed that a saving of 6/3½d per engine is anticipated by adopting the cellulose spraying method, whilst the necessary plant would involve an outlay of £250.0.0d this charge being recovered after treating 800 chassis with cellulose. A sample Wraith crankcase treated in this manner will be available for test upon completion of machining, and should this prove satisfactory, it is proposed that cellulose spraying of all chassis castings be adopted in place of the present linseed oil treatment. [Handwritten]: Rm{William Robotham - Chief Engineer} RHC{R. H. Coverley - Production Engineer}/S.Bannister. | ||