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Tool Talk Discussion Forum

Maybe dumb question

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JoeK

03-06-2005 17:03:35




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Electric motor brushes,as in power tools.I have an older all metal HD 1/2" spade handle drill that has served without fail for nearly 4 decades,but awhile back while boring/lagging some railroad ties it got overheated causing a brush spring to lose it's temper and thereby began arcing and burning up that brush badly.Tag is long gone from drill so no idea what brand.Armature cleaned up fine.
QUESTION:Are all carbon brushes the same,ie:other than size/shape??If I find another carbon brush the same dimensions LxWxH(pair)will they work,or is there something I'm missing here?
Thanx guys.

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Red Dave

03-07-2005 08:01:25




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 Re: Maybe dumb question in reply to JoeK, 03-06-2005 17:03:35  
If you find a set the same size, they should work OK, unless they are a lot harder, or a lot softer than the originals.
Harder would wear the commutator faster, softer would wear out the brush faster. Chances are that most brushes of that type and size will be acceptable though.

I'd suggest that you clean up the armature a little. Use SAND PAPER, not emery cloth, and make sure that the insulators between the segments is not bridged by copper.

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bill b va

03-06-2005 19:29:18




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 Re: Maybe dumb question in reply to JoeK, 03-06-2005 17:03:35  

try a electric motor repair shop .they usually have many brushes in stock .



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MAC,IL

03-06-2005 17:33:41




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 Re: Maybe dumb question in reply to JoeK, 03-06-2005 17:03:35  
Joe: I have used brushs before as long as they are the right size. But you may have damaged the armature, windings or comutator.



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Ohio-Bob

03-07-2005 03:12:00




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 Re: Maybe dumb question in reply to MAC,IL, 03-06-2005 17:33:41  
seeing your posts on elect drills bring up my question, I am looking for the gearing of a 1/2"Skil model # 5 drill, just need some of the gearing, Thanks



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Ol Chief

03-06-2005 20:42:30




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 Re: Maybe dumb question in reply to MAC,IL, 03-06-2005 17:33:41  
Not a dumb question.It seems odd that you had an overheat and then burned a brush. Usually you would not have an overheat unless you really overloaded the drill.If you could see inside,did you notice a RING OF FIRE AROUND the commutator?If you did it is almost a certain sign that there is a shorted coil in the armature which could lead to the brush failure.A motor repair shop can likely supply brushes.They can also test for a shorted coil using an device called an armature growler.Good luck,Ol Chief

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JoeK

03-07-2005 06:50:29




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 Re: Maybe dumb question in reply to Ol Chief, 03-06-2005 20:42:30  
I was running some long lag bolts down and about the 9th or 10th one the drill"sputtered" and lost power and arcing of one brush(ring of fire)was present momentarily.Armature had only very minor tracking on commutator bars,cleaned up very easily w/garnet strip.These brushes have no "lead wire",current is carried by the flimsy brush spring only,the failed one(spring)is badly burned,loosing all it's temper and allowing the burned brush to "float" resulting in my diagnoses of overheated spring causing failure.But your comment makes logical sense.Thanx,I'll have to get the armature checked before pursuing brushes/springs.Hate to lose this ole beast of a drill as it's "always been there" for the hard jobs and short of buying a modern"commercial" 1/2" for major $$ prolly can't be matched for replacement.

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ebbsspeed

03-07-2005 07:12:50




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 Re: Maybe dumb question in reply to JoeK, 03-07-2005 06:50:29  
And if you can, you might try to find a set of brushes that do have a current-carrying tail that you can use. Might take some slight modification, but I'd say it is worth it. I had the same problem with an old RAM circular saw, the brush springs were the current-carrying kind, and on a long, thick cut they got cooked, resulting in a saw that ran like an old hit and miss engine. I put in some brushes with tails and it has worked great since.

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