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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).
Description of wear adjustment, load distortion, and durability for a gear mechanism.

Identifier  ExFiles\Box 15\6\  Scan110
Date  27th May 1930 guessed
  
3.

3. Adjustment for wear.

Adjustment for wear between the follower and cam track is quickly and cheaply effected by removing the cover, withdrawing the follower, complete with the half ball elements, through the rocker shaft, and replacing these elements by one or two pairs of new ones, according to the degree of adjustment required. Wear is almost entirely confined to these elements, since they are made of nickel chrome steel, and are slightly softer than the cam track. Further, owing to their unique self-aligning properties, damage to the cam track by chipping is a practical impossibility. Any end play is readily taken up by the removal of shims from under the end caps.

Double purpose Ball Bearings/
[Text struck through: On larger gears Timken bearings are used in place of the thrust bearings.] These support the cam radially and axially, and are adjusted by the same means.

Any wear in follower bearings which may occur after prolonged use can be catered for by reaming out the bore, and fitting over-size follower. This is a simple matter as the bore is not hardened.

4. A glance at the proportions of the main component parts at once rules out the possibility of fracture, either due to fatigue, or any reasonable shock load.

5. Load distortion.

Under this heading comes the most important and outstanding feature of the whole gear. - The self-aligning capacity of the contacting elements to cater automatically and permanently for any and every form of distortion or displacement of the follower in relation to the cam track. This feature is to be found in no other gear, and effectively prevents the formation of those destructive points of intense local pressure already referred to.
  
  


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