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post #1 of 4 (permalink) Old 07-07-2011, 01:44 PM Thread Starter
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I see numerous references to brushes in routers (and other tools). Pardon my ignorance, but...what exactly are brushes? On the same topic, how long do they typically last, is replacement difficult, etc.

Any guidance is appreciated.

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post #2 of 4 (permalink) Old 07-07-2011, 02:00 PM
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I see numerous references to brushes in routers (and other tools). Pardon my ignorance, but...what exactly are brushes? On the same topic, how long do they typically last, is replacement difficult, etc.

Any guidance is appreciated.

Hi Rob - Welcome to the Forum
Brushes are not something you would normally be concerned about, until there is a problem with the tool running, or not running. They are simply a block of carbon molded to a, usually copper, wire and conduct electricity to the motor armature. Because carbon is relatively soft they are subject to wear and need to be periodically changed. By periodically, it is normally many, many hours of usage before there will be a problem. Problem will usually manifest itself in a failure to run.
As far as ease of changing, some of the older motors need to be dismantled but most modern tools have access caps near the end of the motor so changing brushes is very easy. The caps will be on the side of the motor away from the load end. In example, on a router they will be on the opposite end of the motor from where the bit is installed and on a saw, on the opposite end from the blade

John Schaben

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post #3 of 4 (permalink) Old 07-07-2011, 02:31 PM Thread Starter
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thanks!
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post #4 of 4 (permalink) Old 07-07-2011, 04:51 PM
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Rob,
Just to elaborate on John's response, if you look at the owner's manual there should be a picture showing where the cover for the brushes and what the brushes look like. For example, the retired moderator Hamilin posted the owner's manual and parts breakdown for the router with which I have the most familiarity, the Makita 3612C. Page 13 of the owner's maunal shows a clear picture and describes how to change them and the Parts Breakdown page 1 shows exactly where the brushes and brush covers are located. These manuals can be found as downloadable .pdf files in Router Reference subforum. There are many other brands and models of routers described there also.

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