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).
Heat treatment specification document from Cadillac Motor Car Company for an unspecified part.
| Identifier | ExFiles\Box 17\6\ Scan216 | |
| Date | 16th July 1931 | |
| FORM 2503 1M 1-30 MCG. HEAT TREAT SPECIFICATION CADILLAC MOTOR CAR COMPANY No. 66 DATE 7-16-31 PHYSICAL PROPERTIES ROUGH FINISHED: Refer to detail drawing. Test 100%. Handwritten Note: Obsolete See medium HEAT TREATMENT ROUGH FINISHED: After Forming; Heat to 1625°F.{Mr Friese} Quench in oil. Temper at 650°F.{Mr Friese} for 30 minutes in Homo. Cool in air. Straighten and set. Re-temper at 600°F.{Mr Friese} for 30 minutes in Homo. Cool in air. GENERAL SPECIFICATIONS Rockwell approximately 47-51. VH30 approximately 470-530. Must stand 9 hours continuous running, at period of greatest vibration or noise, without breakage or set of more than 2% of original weight at position of greatest load when assembled. Test 1/2 of 1%. NOTE: Each bundle of wire is to be cut in half, and specimens of wire approximately 9" in length are to be cut from each end of each half Bundle. These specimens of wire are to be etched and examined by supplier and submitted to Cadillac for approval. All bundles to be held by supplier for Cadillac approval before coiling into springs. CHANGE RECORD DATE | MARK | ORDER NUMBER | DETAILS OF CHANGE 3-2-31 | | C-56106 | Rockwell approx. 47-51. VH30 approx. 470-530. was Finished Physical Properties. 3-2-31 | | C-56106 | General Specification note changed. 7-16-31 | | C-57773 | General Specification note changed. APPROVED Jas L A Duerner | ||