Dremel Repair
Intro: Dremel Repair
So my Dremel 395 died mid project!
No power no strange noises! it was just mocking me and acting like it was unplugged!
I figured that since it didn't smell of burning metal I should be able to get it going again.
STEP 1: Assess the Mess!
I did notice that it was running hot for the past little while.
First unplug the tool.
Check to see if the shaft spins freely, if not you may have a bearing problem. You can sometimes free up a bad bearing with light oil but noisy bearings mean mechanical damage and it should be replaced as soon as possible. If the bearings are bad then the whole armature will need to be replaced. this is available online for around $17.
If it does then next check the brushes. These are under small blue screw caps on my tool. They should remove easily and have lots of carbon "brick" left.
On my tool one came out easily while the other separated from the spring and remained in the brush holder.
So it looks like I have a stuck brush which has worn down and no longer makes contact with the commutator (more later)! This explains the no power situation!
STEP 2: Disassembly
Remove the hanging clip
Remove the body screws, mine were torx 15
Gently separate the body halves making sure that no small parts fall out, like the shaft lock assembly at the nose of the tool.
Remove the motor assembly from the body making sure to note which side is up with respect to your dis-assembly order.
Remove the rubber spacer at the rear of the motor shaft
Gently pull the brush block assembly rearward to remove it.
STEP 3: Repairs
Use a rounded tool like a screwdriver shaft and gently push the stuck brush out of the brush block.
Check for damage, in this case there was none and I was able to re-use the brushes and brush block. Gently dress any warped or melted plastic with a needle file or sand paper.
Reattach the spring to the brush using mild force.
Test for proper fit by inserting the brush to make sure that it doesn't bind.
I suspect that the heat was caused by a dirty and worn commutator ( where the brushes contact the rotor), which in turn caused the brush to melt into the carrier.
Using a very fine sand paper ( 800 grit) clean and dress the commutator until it is shiny and smooth. Clean the black lines between the segments of the commutator using a brass brush to remove any chance of shorting.
STEP 4: Reassembly Notes
The brushes go in last! Severely worn brushes should be replaced!
The brush holder connects to the motor assembly via friction fit contacts. Gently press them into place.
Reattach the rubber spacer to the rear bearing and place the motor into the housing.
Place the other half of the housing in place and test that to motor freely spins, if it grinds, open the case and flip the magnet assembly of the motor over and re-install, it should be smooth now.
Screw the case shut.
Look for a dark line on one edge of the brushes, if there is one, then this installs in the direction of the arrow. Dark line in the direction of travel. Install the brush caps.
Plug in the tool and test. If it doesn't spin at this point then you most likely have a burned out switch, unfortunately that will need to be replaced. The switch is available online for around $16.
Mine now works better than it has in a very long time!
Now back to the original project...
43 Comments
Riverboat Roach 2 years ago
thegrimbarian 2 years ago
LGS2013 3 years ago
On a different note, if you could please help me with a reassembly issue?
There is a half-circle metal band that I had placed where it came from before attempting to reconnect the two halves, but it shifted during the reconnect and it got partially stuck in the casing and when I took it out so that I could reposition it, I bent it slightly. The tip was creased by my tweezers and I can't seem to get it back in the exact shape which I believe, is causing it to get stuck again. When I turned on the tool it sounds like a metal flap is being held against fan blades. Any suggestions, tips, instruction? I'd greatly appreciate it! It's enough of an issue that I am unable to click the two halves of the case together properly, it won't snap together, something is in the way. Please help.
:-)
T.I.A.
Builders Shed 7 years ago
ChristopherG69 3 years ago
Same here. Yestrday, I bought a 200 from bunnings. Slow mode does not seem like 15,000. Did you resolve this? Should I just take it back and upgrade to the 3000 series variable speed?
Bengtartist 3 years ago
Bengtartist 3 years ago
thegrimbarian 6 years ago
My Dremel 3000 just gave up like that today when I was trying it out for carving with a flexi shaft; I have only used it for cutting some laminated flooring before. I will try what you suggest. I did take one brush out and it came out freely; but as I didn't really know what I was doing I put it straight back in and didn't take the other one out. I will try that tomorrow. I tried taking the casing apart by taking the screws out. I thought the hanger was still holding it together but wasn't shore so I put the screws back in in case I made things worse.
Bengtartist 3 years ago
dsaav 4 years ago
My favorite part "Now back to the original project..." - yeah no kidding! Fixing this was an annoying side track to the project I set out to do tonight.
melindacrowe61 4 years ago
Random_Canadian 4 years ago
aceE5 6 years ago
MattP167 7 years ago
Theo kane 8 years ago
Hi there, My dremel 3000 stopped working. I've switched, worked for a few seconds and stopped. Checked the fuse, the brushes, are fine. Opened and checked for current continuity, I have current going though, from the circuit board to the variable switch and also I get current from the two of the four probes going through to the element. What do you thing the problem might be? How do I check the element if it works and how do I troubleshoot any further problem areas. I hope I am making my self clear, though my knowledge of electrical and electronics is very basic.
amiir 8 years ago
hey there, sorry for my bad english. your dremel is not dead. you can fix it so easy.
1 extract brushes (Carbons)
2 remove stickers from 2 side of the dremel (Dremel 3000 and the other side)
3 remove all 4 screws with T15 screw driver
4 disapart all parts (Motor, Speed Control Unit and little PCB that started with Main wires.
5 look at the motor body from top. you will see a thin wire is free from its place.
6 solder that wire too correct place and here you go. your dremel is fine.
assemble it just like you dis assembled it. DONE.
Alpha_oi 7 years ago
you are my hero thank you so much!
amiir 7 years ago
You're welcome Alpha_ol
I'm glad I could help
it was my problem too in 3 month ago. i just bought a new dremel 3000 and a set of wood cutter bit. i turn on my dremel with 30000rpm but wood cutting bits made for 20000rpm and i feel a hard vibrate in my hand and after 3 sec my dremel just died! i was so sad because i love my dremel! after i take it apart i just saw the wire which get cut of from its place.
i hope your dremel work for you at least 10 years :))
bobdole1221 8 years ago
Calgary84 8 years ago