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).
The required dynamo brush clearances for 40/50 HP and 20 HP models.
Identifier | ExFiles\Box 165\6\ img010 | |
Date | 3rd November 1925 | |
X5660 To EY. from EFC. c. HY{Tom Haldenby - Plant Engineer}/RD. c. SFT{Mr Swift}/Mr. Brock. c. Test Dept. c. EP.{G. Eric Platford - Chief Quality Engineer} EFC3/T3.11.25. RE 40/50 & 20 HP. DYNAMO BRUSH CLEARANCES. X5660 X5660 The clearances of the dynamo brushes in their holders, e.g. :- An absolute minimum of .005" for the 20 HP. " " " " .002" " " 40/50 HP.. we are look upon as of great importance in ensuring the proper functioning of these machines, and particularly in preventing a machine from attaining a condition of excessive output. It should be possible on any machine in any condition readily to insert a .005" or .002" feeler, respectively, between each brush holder and the leading face of its corresponding brush, i.e. the face facing the approaching commutator. This applies equally to all brushes - positive, negative and control. The side clearances of the brushes in their holders should also be at least .001" in all cases. EFC. | ||