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 discussing the percentage savings in weight and machining time for die casting versus sand casting.
| Identifier | ExFiles\Box 140\3\ scan0079 | |
| Date | 31th October 1936 | |
| LEYLAND MOTORS LIMITED, Head Office and Works. BY APPOINTMENT Manufacturers of Motor Vehicles YOURS Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls}/18.ML. IN REPLY PLEASE QUOTE: OURS SB{Mr Bull/Mr Bannister}/HK.{Col. T. Harker - Sales} Tel: Ext: 151. 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. 31st October, 1936. WN 2 NOV 1936 RECEIVED Messrs. Rolls-Royce Ltd., D E R B Y. For the attention of Mr. Myles. Dear Sirs, Further to our letter of the 28th instant, we have now had an opportunity of investigating the points raised in your letter of the 26th. 1. The percentage saving in weight of metal used for die casting over sand casting;- the average saving on a die casting against a sand casting is approximately 25%. This is possibly due to the fact that we can produce die castings exact to drawing thickness and with reduced machining allowances. In a die casting the tensile strength of the aluminium is increased by approximately 25%, thereby enabling a reduced section to be used without sacrificing strength. We give below details of comparative weights of aluminium sand casting, as against die casting :- Gearbox Part No. 134139 - sand casting - 69 lbs. die casting - 51 lbs. 2. Percentage saving in hours machining: there is very little saving in machining time. This is approximately 9%. | ||