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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).
Paper on ground form finishing hobs and gear manufacturing presented at a Society of Automotive Engineers meeting.

Identifier  ExFiles\Box 136\5\  scan0335
Date  15th January 1940
  
Gears General, 1152. (15)

PREPRINT.--Paper to be presented at the Annual Meeting of the Society of Automotive Engineers at the Book-Cadillac Hotel, Detroit, Mich., Jan. 15 to 19, 1940. Printed to stimulate written or oral discussion. Subject to revision. All papers presented at meetings of the Society are the exclusive property of the Society, from which permission to publish this paper, in full or in part, after its presentation and with credit to the author and the Society may be obtained upon request. The Society is not responsible for statements or opinions advanced in papers or discussions at its meetings.

Rm{William Robotham - Chief Engineer} / F.V. HARDY - Relief Ground Hobs

GROUND FORM FINISHING HOBS
BY
CHAS. R.{Sir Henry Royce} STAUB
CHIEF ENGINEER

MICHIGAN TOOL COMPANY

In modern automobile and machine construction, it has been found advantageous to pay close attention to the inspection of component parts, as in this way much time can be saved in the final assembly.

Gears, however, being more intricate than most parts, must be made and inspected with as much, or more, precision than other machines or auto-mobile components.

There are a good many different ways by which inaccuracy can creep into gears and cause them to be noisy. For instance, steel not properly handled; vis., heat treatment, inaccurate machines, careless operators, and inaccurate generating tools.

Past experience has taught all of us that we cannot deviate very far from the fundamental law of gearing and still expect to get quiet gears.

In order that a pair of gears transmit a constant velocity ratio, their tooth curves must be such that a normal to the common tangent of the teeth at the point of contact will always pass through the pitch point.
  
  


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