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Carbon Brushes Wearing Out Superfast

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Forum topic by TheWoodenOyster posted 11-11-2013 08:36 PM 1676 views 0 times favorited 6 replies Add to Favorites Watch
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TheWoodenOyster

1275 posts in 1401 days


11-11-2013 08:36 PM

Topic tags/keywords: planer

Hey guys,

I have the Delta 22-580 lunch box planer. I got it as a hand me down and it seemed to work great until last week when it quit on me. I figured it might be the brushes and sure enough they were really worn down. I ordered a new set and installed them YESTERDAY. Planer seemed to be running well again except for a somewhat scary scratchy noise. I just figured that noise was a part of wearing in the new brushes. Well, my planer just died again today after maybe 2 to 3 hours of use on the new brushes. The have worn down to about 5/16” from about 5/8” yesterday.

Is this normal?

Surely I don’t need to be replacing these things after 4 hours of use? The initial ones probably lasted about 20 to 30 hours…

Thanks,

Dave

-- The Wood Is Your Oyster


6 replies so far

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tefinn

1222 posts in 1903 days


#1 posted 11-11-2013 08:45 PM

Sounds to me like the armature is damaged and wearing the brushes out. If the original brushes wore down to the armature it might need to be resurfaced or replaced because of scoring. Similar to the rotors or drums on your car’s brakes.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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TheWoodenOyster

1275 posts in 1401 days


#2 posted 11-11-2013 09:12 PM

Tom,

Please excuse my lack of knowledge, but what is the armature? I can look into the slot where the brushes were and see that something does not look right, at least it doesn’t look the same when you look down each brush slot. I assume that this may be the armature.

An update: I just tried to smooth these brushes out and put them back in. They ran for about 20 seconds before both brushes broke apart and the motor died. Does this help figure anything out?

-- The Wood Is Your Oyster

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teejk

1215 posts in 2150 days


#3 posted 11-11-2013 09:14 PM

Wow…I have had that planer for about 10 years now, have run several hundred bd ft of lumber through it and have never even thought about the brushes. I would suspect bearings. That said, some brushes are beveled and have to be installed in one way only. I doubt that is your problem though. Back to bad bearings I think.

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crank49

3981 posts in 2437 days


#4 posted 11-11-2013 11:43 PM

New brushes need to be run for several minutes with no load to give them time to conform to the curvature of the commutator on the armature.

It’s possible your commutator is damaged if you did not do this. Will probably have to be turned true now.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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tefinn

1222 posts in 1903 days


#5 posted 11-12-2013 12:42 AM

Thanks Michael for clarifing. Yes, the brushes ride on the commutator which is part of the armature. It really sounds as if the commutator is damaged. Either it was damaged by the old brushes or the new ones weren’t run in properly. It’s also poossible as teejk says that they needed to be installed in a certain direction.

teejk – If it were bad bearings, more than likely the noise would have been there before changing the brushes. The bad bearings wouldn’t cause the new brushes to wear that quickly. If they were that bad the planer would probably destroy itself while running.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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TheWoodenOyster

1275 posts in 1401 days


#6 posted 11-12-2013 01:33 AM

Yeah. I let the new brushes run with no load for 10 minutes or so. I noticed the scratchy sound when I put the new brushes in. And then it just sort of got worse until the brushes crumbled. I am kind of thinking it might be time to hit craigslist. There is a point of futility, and I think I am at the threshold. It’d probably be 150 or 200 bucks to fix from what it sounds like.

-- The Wood Is Your Oyster

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