Cost comparison between die casting and sand casting for a lower half crankcase.
| Identifier | ExFiles\Box 148\5\ scan0402 | |
| Date | 3rd August 1938 guessed | |
| Crankcase - Lower Half. -------------------- Die Casting Costs. Direct Labour. Core-making Nil. Casting 3.00 Hrs. Fettling 1.40 " ------- 4.40 " Labour Cost @ .8s per hour = 3.5 shlgs. Labour Cost Saving = 6.9 shlgs. Material. Die Cast Weight. = 29 lbs. Die Cast Weight Saving = 5 lbs. Total Saving :- in A. {Mr Adams} RR50 @ 1/3d per lb = 11/1d = 21% B. AGM @ 5d per lb = 37/4d = 71% C. L8 @ 7½d per lb = 31/2d = 60% Sand Casting Costs. Direct Labour: Moulding ) Core-making ) 13 Hours. Fettling ) --------- 13 Hours. Labour Cost @ .8s per hour = 10.4 shlgs. Material: Sand Cast Weight = 34 lbs. Total Cost: Material = 42.5 shlgs. Labour (Direct) = 10.4 " ------ 52.9 " Recuperation of Tool Charges. Material. Cost of case. Saving. Tool Cost. Quantity. A. {Mr Adams} RR50 41/8d. 11/1d. £800 1,450 B. AGM. 15/5d. 37/4d. " 430 C. L8 21/7d. 31/2d. " 515 4. | ||
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).