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).
Cost comparison analysis between die casting and sand casting for a crankcase top half, including labour, materials, and tool charges.
| Identifier | ExFiles\Box 148\5\ scan0403 | |
| Date | 13th August 1938 guessed | |
| Crankcase - Top Half. Die Casting Costs. Direct Labour: Core-making 10 Hrs. Casting 6 " Fettling 3 " ___ 19 " === Labour Cost @ .8s per hour = 15.25 shlgs. Labour Cost Saving = 14.75 shlgs. Material: Die cast Weight = 60 lbs. Die Cast Weight Saving = 8½lbs. Total Savings: in A.{Mr Adams} RR50 @ 1/3d per lb = 26.25s = 22% B. AGM @ 5d per lb = 76.25s = 65% C. L8 @ 7½d per lb = 63.50s = 54% Sand Casting Costs. Direct Labour: Core-making ) Casting } 38½ Hrs. Fettling ) ___ 38½ " === Labour Cost @ .8s per hour = 31.0 shlgs. Material. Sand Cast Weight = 68½ lbs. Total Cost: Material. 85.5 shlgs. Labour.( No oncost) 31.0 " _______ 116.5 " ======= Recuperation of Tool Charges. Material. Cost of Case. Saving. Tool Cost. Quantity. A.{Mr Adams} RR50 90/3d 26/3d. £1,200 1,100 B. AGM. 20/3d 76/3d " 320 C. L8 52/9d 63/6d. " 380. | ||