Rolls-Royce Archives
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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).
Inter-organization letter from Cadillac Motor Car Company discussing gear tooth relief, rotary lapping, and practices for LaSalle transmissions.

Identifier  ExFiles\Box 170\2\  img268
Date  2nd April 1935
  
GM 47 J

CADILLAC MOTOR CAR COMPANY
INTER-ORGANIZATION LETTERS ONLY

DATE April 2, 1935
TO ADDRESS
FROM ADDRESS
SUBJECT

-2-

may at this time show a slight relief due to the grinding wheel not having finished the involute, causing interference, which laps away the tip of mating gear teeth. It is important not to overdo the rotary lapping operation since it finally results in a single pitch line contact. Gears are considered sufficiently lapped when approximately 50% of the operating tooth faces show contact.

A chart showing tooth contacts as actually practiced for the Cadillac gears is herewith attached.

Our practice for the LaSalle transmission is different due to different lapping method.

E.{Mr Elliott - Chief Engineer} R.{Sir Henry Royce} Hyland

ERH/am
  
  


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