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Elec. Drill problem

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Micheal

04-30-2001 09:26:28




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I have a craftsman 1/2in. elec. drill that my dad gave me. he said it was shot. it runs, but i notice that there is quite alot of 'light' on the armature where the brushes are. Could this be a brush problem, they are pretty short, or is it something else causing it to make a lot of sparkes back there. I can get brushes for less than $5, is it worth it to put them in, or do you guys think the armature is shot.

thanks
micheal

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Micheal

05-03-2001 06:53:31




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 Re: Elec. Drill problem in reply to Micheal, 04-30-2001 09:26:28  
Thanks guys for all the responses!

I got brushes from local motor shop for $2, polished the armature and ran it in the open so i could see what was going on. Looks like one of the two brushes is causing all the sparking. Could the brush holder be shorting? The one side throws a long arc that follows the armature turn for about a 1/2 in. as the drill runs. Does this mean the armature has a short? It the armature has a short, is it scrap and wait for a good used one to turn up?

thanks for all your help.
micheal

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John in MA

05-03-2001 20:43:46




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 Re: Re: Elec. Drill problem in reply to Micheal, 05-03-2001 06:53:31  
That sounds like a short. Check the commutator to see if there is burning/erosion between two of the pads.

I'd say to just use it (unless this can damage the stator winding--help me, guys?) until it burns out. Then wait for a replacement part/drill.



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John in MA

05-01-2001 20:58:48




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 Re: Elec. Drill problem in reply to Micheal, 04-30-2001 09:26:28  
Sparking is either bad brushes or a shorted armature. I got an old B&D drill that barely turned and sparked like crazy. After a complete cleaning (grease on commutator) it runs like new. I also have an old router that I tried the same thing on--no dice. It was very shorted. I say get the brushes for $5. You may get lucky. Also clean the commutator with lighter fluid on a kleenex just to be complete. That'll remove any grease or junk that's there. DON'T use emery cloth or most sandpaper. Emery is a conductor and silicon is a semiconductor. Bother could cause shorts if you're not careful. I speak from experience of a long time ago.

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JerryU

05-02-2001 08:19:11




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 Re: Re: Elec. Drill problem in reply to John in MA, 05-01-2001 20:58:48  
Another thing with the armature is to turn the commutator. If you have a drill press, simply chuck the shaft in the press and use a fine mill file to lightly dress the commutator, then clean as described. Takes all the grooves out and makes it nice and smooth for the new brushes.

JU



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Dave T

04-30-2001 13:31:05




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 Re: Elec. Drill problem in reply to Micheal, 04-30-2001 09:26:28  
These old Craftsman drill motors are 10x the tool that they mfg now. Fix it...



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Bama Dee

04-30-2001 12:15:28




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 Re: Elec. Drill problem in reply to Micheal, 04-30-2001 09:26:28  
Invest the 5$ and clean the armature with some sand paper or emery cloth, then blow it out with some compressed air (wear safety glasses). The brushes have a copper wire pigtail imbedded in them and when the brushes wear down,the copper will burn , this will ruin the armature in short order. GL Dee



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Dusty

04-30-2001 19:06:18




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 Re: Re: Elec. Drill problem in reply to Bama Dee , 04-30-2001 12:15:28  
Never use emery cloth on anything electical, it is a conductor. Brushes are useuly made from carbon vary cheep. It could be a bad winding in the armature.
Good Luck,
Dusty



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Bus Driver

04-30-2001 18:27:47




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 Re: Re: Elec. Drill problem in reply to Bama Dee , 04-30-2001 12:15:28  
If you go to the trouble to remove the armature, take it to a shop that repairs generators and starters for cars, trucks and tractors. Have them test it for internal shorts on their growler. The sparking is a symptom of such shorts. The drill will run for a while, probably not long, at reduced power with shorted armature. Sears is making repair parts for the old stuff much less available, perhaps liability concerns. Long shot, but another identical drill may turn up some day (maybe at yard sale), so save the old drill for parts even if not usable.

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