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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).
Advertisement for The Ohio Crankshaft Co.'s TOCCO PROCESS for surface-hardening engine components.

Identifier  ExFiles\Box 132\1\  scan0009
Date  1st January 1937 guessed
  
Handwritten: Cranks - 11/6

"TOCCO-HARDENED CRANKSHAFTS TO SAVE ENGINE USERS MILLIONS"

Metallurgists and engineers who watched the commercial TOCCO-hardening of crankshafts at the recent Cleveland Metal Show estimated that the adoption of the process by engine manufacturers would mean the saving of millions of dollars to the operators of trucks, buses, agricultural and industrial machinery and passenger cars. These savings, they said, will result, first, from lower cost of manufacture - through the elimination of expensive alloy steels and the cutting down of machining time as well as heat-treating time and expense and, second, from important economies in maintenance expense, lower oil consumption and far longer periods of uninterrupted service. At left - TOCCO-hardening equipment at the Metal Show.

THE TOCCO PROCESS of surface-hardening by electrical induction produces an exact result. Shafts can now be hardened quickly at small cost, and at the bearing points only - to 58-60 ā€œCā€ scale Rockwell hardness (600 Brinell). This permits harder bearing metals and longer-lived engines. While the first application of the TOCCO PROCESS to be worked out and perfected for industrial use has been the hardening of crankshafts at the bearing surfaces, many manufacturers have completed tests and are about to adopt the process in hardening other important parts such as axle shafts, cam shafts, front wheel spindles, steering gear Pitman arm shafts, etc. Other applications are being developed.

AMERICA'S FOREMOST MOTOR CAR AND ENGINE MANUFACTURERS HAVE ADOPTED THE TOCCO PROCESS

The TOCCO PROCESS saves money for both the engine manufacturer and the engine operator. It has already been adopted by such leading manufacturers as the Autocar Company, the Cummins Engine Company, the General Motors Corporation, the Hercules Motors Corporation, the International Harvester Company, the Packard Motor Car Company, the Waukesha Motor Company, the White Motor Company and many others. Purchasers and operators of engines or equipment made by these outstanding companies may safely anticipate important savings in maintenance and operating costs.

THE OHIO CRANKSHAFT CO. Cleveland, Ohio
  
  


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