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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).
Letter to The Adamant Engineering Co. Ltd. regarding the examination of fractured parts from a Marles gear.

Identifier  ExFiles\Box 153\2\  scan0150
Date  29th October 1936
  
1300

Exptl. Dept.

Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}27/JH.

29th October, 1936.

Messrs. The Adamant Engineering Co.Ltd.,
Dallow Road,
Luton.

For the attention of Commdr. Matravers.

Dear Sirs,

We are sending to you under separate cover the following parts of the second 1 7/16 Double Tooth Marles gear which you sent us.

(1) Rockershaft.
(2) Rockershaft pin and washer.
(3) One half of fractured roller follower.
(4) Two inner races with retaining clip and 26 balls.

Of the two fractured surfaces on the roller the smooth one occurred in service.

Our Laboratory have not yet completed their examination of the other half of the roller but from the appearance of the fracture, it appears that the roller is hard throughout.

On examination of the various parts will show the following defects :-
  
  


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