Posted by Gerald J. on May 03, 2009 at 20:06:22 from (4.254.65.81):
In Reply to: Re: Simple! posted by CMorris on May 03, 2009 at 13:48:43:
The bushings are the bearings for the armature. The magnetic forces on the armature pull it towards the field pole pieces, really hard. I had an 8N more than 25 years ago, and its starter needed new bushings then.
New brushes are straight across and have a radius near that of the commutator, but a very used commutator is not straight. It has ridges and grooves around it. You need the WHOLE surface of the end of the brush against the commutator to carry the couple hundred amps. When you don't turn the commutator and sand the brush to fit (with a strip of sandpaper wrapped around the freshly turned commutator) you concentrate that current in a small area which leads to burning damage to brush and commutator. And poor starter performance because of the power lost there.
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