Looks like 12mm.
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They appear to be the same brushes as the Makita trim routers. CB408
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5 sets of brushes are $10 on Amazon, we just need to figure out which ones fit.
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Or 10 sets for $6 - and you get an extra mm! Which would probably fit or could shave just a bit off.
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That is great, these are $10 for two sets, Amazon.com, looks like a few other clones use them in the comments as well.
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I think that came with spare brushes and I think they are the same as the Kobalt.
Yep. 2 sets.
But so far, the Kobalt has run for several hours with no issues. I think the problem was the heavy dust accumulation that I hadn’t cleaned yet.
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That first pic,maybe camera angle. Any way the wire braid looks wrong. The braid should not go through the side of the spring. It also appears some of the braid is broken. If this is true then the brush may bind and be intermitted.
Yes. I was surprised at how mangled the brushes appeared when I pulled them. I tried to straighten them a little bit, and for now the router is running, but I’m going to try some new ones and see how they do.
This event has been an eye-opener for me.
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Having read through this thread, I’m guessing that brush inspection and cleaning is going to be added to a lot of people’s regular maintenance schedule.
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It will be for me, for sure. I’ve been running routers for decades and this is a first for me. Of course, this (2.5D carving) application where a trim router runs for hours at a time is just much more challenging than the usual trim router application. I’m also wondering if some of the reported unsteady operation of these Kobalts might have been due to sloppy initial assembly of the brushes.
Spare brushes arrive tomorrow.
Luckily, my other Kobalt is on the LR4 with excellent dust collection. But it’s not easy to add that to the Primo.
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Running the routers for hours at a time at a reduced RPM might also be running them with reduced cooling effectiveness for the fans that are built onto the motor armature. I’d consider adding some supplemental cooling if you can see a way how.