Go Back   DIY Chatroom Home Improvement Forum > Equipment & Safety > Tools


Thread Tools Search this Thread Display Modes
Old 11-14-2012, 11:13 AM   #1
Join Date: Oct 2012
Location: So. Central PA
Posts: 129
Rewards Points: 95

Dewalt 18 volt drill problems

I have two NiCad 18 volt 1/2" drills, one with hammer feature, and both are around 8 or so years old with very light use. By light use I mean general household usage, not any sort of general contractor use.

They both have an issue in which they bog down, either under load or free spinning. It appears to be an issue back at the brushes, as wisps of white smoke come from the vents. I can usually "clear" it by simply going from FWD-RVS several times free spinning. I've tried a couple things to clear it for good short of taking the things apart and replacing stuff - blowing really hard on the brushes, using a shop vac there, even sprayed contact cleaner....none have worked any better than the back and forth technique.

Any idea/s on what the cause may be along with a permanent fix? It doesn't happen all the time, but often enough to cause me aggravation.


Chokingdogs is offline   Reply With Quote
Old 11-14-2012, 12:17 PM   #2
Tool Geek
PaliBob's Avatar
Join Date: Jun 2008
Location: Pacific Palisades CA
Posts: 2,534
Rewards Points: 2,048

Dewalt 18 volt drill problems

Originally Posted by Chokingdogs View Post
....as wisps of white smoke .....
once the smoke escapes, it can't come back

& Stay Safe
.....Bob Lavery
PaliBob is offline   Reply With Quote
The Following User Says Thank You to PaliBob For This Useful Post:
woodworkbykirk (11-14-2012)
Old 11-14-2012, 12:18 PM   #3
Join Date: Jul 2010
Posts: 1,785
Rewards Points: 1,084

Dewalt 18 volt drill problems

Based on your observations, I think that you are on the right track, and would replace the brushes.
DexterII is offline   Reply With Quote
Old 11-14-2012, 03:57 PM   #4
journeyman carpenter
woodworkbykirk's Avatar
Join Date: Sep 2011
Location: nova scotia canada
Posts: 2,748
Rewards Points: 2,112

Dewalt 18 volt drill problems

you see smoke.. the motor is starting to die.. its already overheated so the electrical has been compromised
woodworkbykirk is online now   Reply With Quote
Old 11-15-2012, 12:05 AM   #5
Join Date: Nov 2012
Posts: 30
Rewards Points: 25

Dewalt 18 volt drill problems

That's not regular smoke you are seeing. It's really called magic smoke.

All electronic items operate by means of magic smoke. They are filled with it from the factory and then sealed. If you start seeing bits of it leaking out, there is a problem somewhere and yours sounds like a brush issue. It could also be a corrosion issue on the commutator where the brushes ride.

You have to be very careful when dealing with magic smoke. If all of the magic smoke escapes from your electronics, then they will never work again and must be replaced.
spotco2 is offline   Reply With Quote
Old 11-15-2012, 08:54 AM   #6
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,518
Rewards Points: 4,152

Dewalt 18 volt drill problems

If you can open it up clean the armature with a pencil eraser, use an ohm meter to check to continuaty between the segments. Use a jewlers flat screw driver and run it between the segmants. Make sure the brushes slide easly in the holders. (since you have it apart may as well change the brushes)
joecaption is offline   Reply With Quote
The Following 2 Users Say Thank You to joecaption For This Useful Post:
Thurman (11-24-2012), ToolSeeker (11-15-2012)
Old 11-19-2012, 05:21 PM   #7
Join Date: Nov 2008
Posts: 96
Rewards Points: 75
Thumbs up

Dewalt 18 volt drill problems

I had the same problem with my 18v dewalt hammer drill. I also originally thought it was a problem with the brushes. But when I had it apart I could tell they were not worn and the problem was more with the armature (magic smoke home). $30 on eBay and I had a new motor shipped.

Good luck!

Occam's Razor - The simplest answer is probably the correct one.
JCAHILL4 is offline   Reply With Quote
The Following User Says Thank You to JCAHILL4 For This Useful Post:
PaliBob (11-21-2012)

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
drill for mixing mud jburchill Drywall & Plaster 19 10-17-2011 07:22 AM
7" Tapcon drill bit wobbles?? ARuby Tools 6 08-17-2011 10:53 AM
Which would be the better drill to buy? Syii Gardan Tools 6 07-31-2011 12:38 PM
Dewalt 18v Cordless Drill jrepp Tools 16 04-03-2008 11:37 PM
recommendations for an all-purpose drill mcvane Tools 18 11-29-2007 10:12 AM

Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.