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Minn Kota troller - made it quiet again in 30 minutes
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<blockquote data-quote="JMichael" data-source="post: 237711" data-attributes="member: 7544"><p>There is one point I would add to this writeup. All the individual contacts on the commutator (that's the part of the armature the brushes come in contact with, for those that might not know), are separated by mica. The contacts wear down also, just not as fast as the brushes. Sanding the commutator to get a clean even surface wears it down even more. If it gets to a point where the mica is even with the surface of the commutator contacts, your brushes will wear down many times faster because of the added friction and your motors performance will suffer. The mica needs to be undercut so that it is 1/32" or .032" lower than the contacts (no more than 3/64 max). If yours need to be cut down, you can do this with a triangular file and a sharp hack saw blade. <strong>DO NOT</strong> use a dull blade as this will tear the mica rather than cut it. Use the file to start a grove in the center of the mica between each pair of contacts. Then use the hack saw blade to undercut the mica. Be careful not to let the blade jump up on your contacts and scratch them up and blow off any mica dust when finished.</p></blockquote><p></p>
[QUOTE="JMichael, post: 237711, member: 7544"] There is one point I would add to this writeup. All the individual contacts on the commutator (that's the part of the armature the brushes come in contact with, for those that might not know), are separated by mica. The contacts wear down also, just not as fast as the brushes. Sanding the commutator to get a clean even surface wears it down even more. If it gets to a point where the mica is even with the surface of the commutator contacts, your brushes will wear down many times faster because of the added friction and your motors performance will suffer. The mica needs to be undercut so that it is 1/32" or .032" lower than the contacts (no more than 3/64 max). If yours need to be cut down, you can do this with a triangular file and a sharp hack saw blade. [b]DO NOT[/b] use a dull blade as this will tear the mica rather than cut it. Use the file to start a grove in the center of the mica between each pair of contacts. Then use the hack saw blade to undercut the mica. Be careful not to let the blade jump up on your contacts and scratch them up and blow off any mica dust when finished. [/QUOTE]
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Minn Kota troller - made it quiet again in 30 minutes
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