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 analysis comparing different crankshaft forging and material specifications for the Phantom III and Wraith models.
| Identifier | ExFiles\Box 148\5\ scan0218 | |
| Date | 13th November 1937 guessed | |
| CHASSIS CRANKSHAFT COST ANALYSIS PHANTOM III | DESCRIPTION | FORGING COST | FORGING WEIGHT | FORGING COST PER LB/WT | M/C COST INCL BURDEN | HARDENING COST | TOTAL FACTORY COST | SAVING PER CHASSIS | ADDITIONAL TOOL COST | NO. OF CHASSIS TO RECOVER TOOL COST | |---|---|---|---|---|---|---|---|---|---| | E 86615 P3 STANDARD CRANKSHAFT MATL. V.C.M. | £10-0-0 | 190 LBS | 12.6d/LB | £9-15-0 | £1-8-0 | £21-3-0 | | | | | E 88364 P3 CRANKSHAFT WITH PACKARD TYPE BALANCE WEIGHTS TO LEC 5230. BALANCE WTS COST SAME AS PRESENT STANDARD. MATL VCM | £7-15-0 | 175 LBS (APPROX) | 10.6d/LB | £8-9-0 | £1-2-6 | £17-6-6 | £4-2-6 (INCLUDES 6/- ASSEMBLY SAVING) | £600 DIES £195 TOOLS = £795 | 192 | | E 88364 AS ABOVE MATL. B.E.S.A S76 .40 CARBON STEEL, 'TOCCO' HARDENED | £5-15-0 | 175 LBS (APPROX) | 7.9d*/LB | £8-9-0 | £3-3-0 | £17-7-0 | £4-2-6 (INCLUDES 6/- ASSEMBLY SAVING) | £600 DIES £195 TOOLS £87-10-0 'TOCCO' CLAMPS = £882-10-0 | 215 | | E 88364 AS ABOVE MATL. B.E.S.A. S76 .40 CARBON STEEL, UNHARDENED | £5-15-0 | 175 LBS (APPROX) | 7.9d/LB | £8-9-0 | NIL | £14-4-0 | £7-5-0 (INCLUDES 6/- ASSEMBLY SAVING) | £600 DIES £195 TOOLS = £795 | 110 | WRAITH (ALMOST IDENTICAL WITH 25/30 AND BENTLEY) | DESCRIPTION | FORGING COST | FORGING WEIGHT | FORGING COST PER LB/WT | M/C COST INCL BURDEN | HARDENING COST | TOTAL FACTORY COST | SAVING PER CHASSIS | ADDITIONAL TOOL COST | NO. OF CHASSIS TO RECOVER TOOL COST | |---|---|---|---|---|---|---|---|---|---| | EW 912 WRAITH CRANKSHAFT MATL VCM | £6-0-0 | 140 LBS | 10.3d/LB | £5-14-6 | £0-17-0 | £12-11-6 | | | | | EW 912 WRAITH CRANKSHAFT MATL B.E.S.A S76 .40 CARBON STEEL, 'TOCCO' HARDENED | £4-15-0 | 140 LBS | 8.15d*/LB | £5-14-6 | £1-12-6 | £12-2-0 | £0-9-6 | £22-10-0 'TOCCO' CLAMPS | 260 | | EW 912 WRAITH CRANKSHAFT MATL BESA S76 .40 CARBON STEEL UNHARDENED | £4-15-0 | 140 LBS | 8.15d/LB | £5-14-6 | NIL | £10-9-6 | £2-2-0 | NIL | | NOTE: IN EACH CASE THE LOWEST FORGING QUOTATION WAS SUPPLIED BY ENGLISH STEEL CORPORATION & THEIR FIGURES ARE THEREFORE GIVEN ABOVE. * FOR COMPARISON, THE LEYLAND CRANKSHAFT FORGING OF SIMILAR DESIGN & MATERIAL COST 7.75d/LB | ||