Quote:
Originally Posted by macafee2
I think they may need changing, spinning the fan backwards does seem to give off a brush sound but forwards is ok.
macafee2
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I would expect that to be the case, brushes bed themselves in, in the usual direction of rotation, building up a sharper corner at the trailing edge. Your spinning it in reverse, mean that sharp trailing edge becomes a leading edge. It is bound to sound a little different. What matters is the condition of the brushes and the commutator.