Question about Metabo WE14-150 Quick Angle Grinder
From my own experience.
Are the strips of the commutator smooth and flat?
(Not to insult you. The part of the armature that the brushes ride on)
If they aren't, the brushes will bounce up and down.
I put one end of the armature in a drill, and have a helper run the drill. The other end of the armature rests in the front bearing of the grinder head, which is fastened down. (To a bench) Then I use a medium tooth, (B astard) file to dress the commutator bars flat.
I also put medium grade sandpaper in-between the brushes, and the commutator surface to dress an arc on the brushes. (Turn the armature by hand while keeping the sandpaper in place)
Brushes come with a flat surface. Putting a radius on them to fit the arc of the commutator, gives them a good contact surface to start from.
Be sure the springs are putting pressure on the brushes. Sometimes the brush mounts need to be cleaned, or the brush will not slide through the mount like it should. The brush will again, 'Dance' on the commutator. (Bounce up and down)
Posted on Sep 06, 2009
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Posted on Jan 02, 2017
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