INVESTIGATE NOISE
What Various Sounds Mean
Noise from the dynamo of a car is worth investigating promptly. If of a rumbling or pounding variety, it is due usually to slack bearings, and at that stage costs little to rectify. Should it be allowed to continue, however, there is risk of Hie armature fouling the pole pieces, with serious results. Squeaking arises from the commutator, and does no harm. Do not attempt to deal with its lubrication, but have the brushes properly bedded down This will improve and steady the charging and prevent burning of the commutator.
Tho method of seating the brushes is to pass a strip of fine glasspaper around the commutator and grind in the brushes on to it to the correct curature by revolving the armature. This is essential when new brushes are fitted. Similar paper may be held against the commutator when it is revolving to clean it, but if it is badly burnt, pitted, or out of round, it must be removed for facing in a lathe.
Rapid brush wear is due to the mica projecting between tho segments or to the commutator needing refacing. Tho mica should bo undercut slightly below the level of the copper with a piece cf | hacksaw blade. Use glasspaper afterI ward to remove any blurring of the i copper.
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Bibliographic details
Hawke's Bay Tribune, Volume XXV, Issue 124, 11 May 1935, Page 13
Word Count
220INVESTIGATE NOISE Hawke's Bay Tribune, Volume XXV, Issue 124, 11 May 1935, Page 13
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