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).
Letter from Leyland Motors regarding machining difficulties with Firth's N.M.C. steel and requesting advice.
| Identifier | ExFiles\Box 140\3\ scan0101 | |
| Date | 29th December 1936 | |
| 1201/1312 Leyland BY APPOINTMENT LEYLAND MOTORS LIMITED, Head Office and Works, Manufacturers of Motor Vehicles. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS CUSTOMERS' VEHICLES DRIVEN AT OWNERS RISK ONLY TELEGRAPHIC ADDRESS: LEYMOTORS, LEYLAND. TELEPHONE: LEYLAND 81400 (16 Lines) LEYLAND, LANCASHIRE. YOURS....... IN REPLY PLEASE QUOTE: OURS SM/ET Tel.Ext.148. 29th December, 1936. W.A. Robotham, Esq., Rolls Royce Limited, DERBY. Dear Sir, We are experimenting with a sample consignment of Firth's N.M.C. steel, supplied in bars of 1-3/8" diameter, and are experiencing considerable trouble with the machining of this steel. So far we have found it necessary to carry out an annealing treatment before commencing machining, and even after this treatment the machining time for a given size of bolt made from this steel is almost double that of the time required to machine a bolt from steel supplied to our usual standards. If you have any experience of this type of steel, could you please advise us with regard to the necessary heat treatment before machining, and also let us have recommendations for the most suitable type of tool steel, cutting speed, and rate of feed. Thanking you in anticipation, We are, Yours faithfully, p.p. LEYLAND MOTORS LIMITED, M Pilkington Chief Engineer. | ||