Seating Brushes
When new brushes are installed in a motor, the brush surface contacting the commutator will have to match the curved surface of the commutator. If the brush is not already precurved from the manufacturer, then you will have to form the curve yourself.
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This video shows how you can use fine sandpaper facing outward under the brush to help form the curve. Once the curve is formed a seating stone is used to polish the brush surface.
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