Posted by chas on April 22, 2012 at 14:25:28 from (93.23.203.235):
In Reply to: starter commutator posted by montidale on April 22, 2012 at 10:46:29:
The pro's use a fibre-glass rod, however unless the commutator is badly scored or pitted it shouldn't be necessary to use abrasive. Ideally, if the scoring is not great and the surface is just dirty, use only a solvent to clean down and inspect. The working surface area ideally should be a 'chocolate brown' colour (once you get rid of the carbon), identifiably darker than the 'unbrushed' areas. If this is the case, the copper has been surface hardened, polished and is in best possible state. Removing this with abrasive takes it back to soft copper and increases wear. Clean between the segments with a toothpick or matchstick, clean off again with solvent. Light scoring is no problem, new brushes will bed in over it. Make sure the brushes / holders dont bind and spring pressure is good. If the commie is grooved or heavily scored it may need skimming. If the brushes are worn short enough to reduce spring pressure, then replace them. To bed-in new brushes, wrap a strip of emery - rough side up - around the commie, allow the brushes to press against it and rock the commie to shape the brush.
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