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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).
Correct dynamo brush clearances for the 20 HP model.

Identifier  ExFiles\Box 165\6\  img012
Date  16th November 1925
  
X5860

To BY/RD. from EFC.

EFC5/T16.11.25.

RE 20 HP. DYNAMO BRUSH CLEARANCES. X4610 X5860

The .005" was quoted from figures you gave us for the 20 HP. which gave minimum .005", maximum .015" (brush box a pressing). I cannot trace any error in this Dept.

In any case, we are of the opinion that the .005" figure which we have instructed to production should stand. We consider .005" is definitely preferable to .003", in this particular case of the pressed brush box, and would be pleased if you would alter your own instructions accordingly.

EFC.
  
  


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