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 for a Rear Axle Housing, contrasting die casting and sand casting methods.
| Identifier | ExFiles\Box 148\5\ scan0401 | |
| Date | 3rd August 1938 guessed | |
| Rear Axle Housing. -------------------- Die Casting Costs. Sand Casting Costs. ------------------ ------------------- Direct Labour. Direct Labour. Core-making 2.00 Hrs. Moulding } Casting .50 " Core-making } 8.20 Hrs. Fettling 1.00 " Fettling } ------ ------- 3.50 " 8.20 " Labour Cost @ .8s per hour = Labour Cost @ 8s per hour = 2.61 shlgs. 6.91 shlgs. Labour Cost Saving = 4.30 shlgs. Material: Material: Die cast weight = 20 lbs. Sand cast weight = 21.25 lbs. Die Cast Weight Saving = 1.25 lbs. Total Cost. Total Savings:- in Material = 26.7 Shlgs. A.{Mr Adams} RR50 @ 1/3d per lb = 6/- Labour (Direct) = 6.91 " or 18% ------- B. ACM @ 5d per lb = 22/6d 33.61 " or 67% C. L8 @ 7 1/2d per lb = 20/- or 60% Recuperation of Tool Charges. ----------------------------- Material. Cost of Housing. Saving. Tool Cost. Quantity. A.{Mr Adams} RR50 27/7d. 6/- £120 351 off. B. ACM. 11/- 22/7d " 94 " C. L8 13/7d. 20/- " 120 " 3. | ||