Dremel Problem

[Ian_Edwards]

Hi,

I have a Dremel 8200 with a Li ion battery and it's stopped working!

I was working on some GRP laminate and I overload it, I stalled the motor.

Since then it has worked intermittently, i.e. sometimes it switches on, sometimes it doesn't.

It now won't switch on at all.

The battery appears to be fully charged, when I plug the battery into the charger the green light flashes a few times then switches to a solid green light.

It almost feels like an On/Off switch problem.

The unit is out of guarantee, so before I take a screwdriver to it, has anyone else had this problem with a Dremel 8200, or have I completely knackered it?

 

[l'escargot]

I have one that behaves in a similar way. I don't have a solution either though.

 

[elton]

I would guess the brushed are burned out, or one or both has become disconnected, or is sticking in the carrier.

 

[sailinglegend420]

Mine died too and it is very cheap to buy replacement motors on ebay.

 

[Ian_Edwards]

That's 3 dead or dying Dremel 8200 reported on this forum in about an hour.

It's beginning to sound like a design fault!

I'll look at eBay for a replacement motor, thanks for the tip.

 

[viva]

Dremel - Never Again

My mains powered Dremel burnt out after about 10 mins of use. The cheap Lidl substitute continues to work fine.

 

[Marine Reflections]

I've just replaced a burnt out resistor in the charger for my 8200 and it's still not charging :disgust:

This is the third cordless Dremel I have got through, each about £100

My corded one (car boot) has lasted for ten years, and is still going strong - cost £3

 

[laika]

Mine's been iffy since just out of warranty. Works. Stalls. Leave it a bit. Works again. Seems to be heat related: problem was much worse in the full summer sun. If you look online there are loads of reports of it. I was thinking of sending mine back to Bosch to be repaired but throughout the summer when I was working on the boat I didn't want to be without it for more than a week. Even working intermittently it was still useful. I should probably do it now...

 

[William_H]

Typical of this kind of motor is brushes that are hard metal or carbon that lean on the commutator. You can remove the end cap of the motor to access the brushes and commutator. The commutator can be cleaned with wd40 or contact cleaner or if necessary fine sand paper. The brushes may need more spring tension or may be knackered. )this will be obvious). The real trick is often to get the brushes and end cap back on as you have to hold the brushes off the coommutator so they can slip over then you release the spring tension. Do not if at all possible remove the armature from the casing and magnets as some magnetism may be lost. Just have a fiddle then buy a new motor. good luck olewill

 

[johnww]

My battery packed in after about 14 months (just out of warranty!)
Replacement battery was almost as much as a new unit...........

 

[sailinglegend420]

That's 3 dead or dying Dremel 8200 reported on this forum in about an hour.

It's beginning to sound like a design fault!.....

These tools are designed for fine craft work. I think they get abused on a boat - I've cut anchor chain links with mine with no apparent problem. Mine lasted 7 years as a permanent liveaboard.

 

[thalassa]

My mains powered Dremel burnt out after about 10 mins of use. The cheap Lidl substitute continues to work fine.

The museum restoration shop where I now and then help out, only buys PROXXON tools now. Costs about the same, and is proper tooling. At home I've got Dremel and Aldi. It is the latter one I'm using all the time.

 

[cimo]

Hi,

............It almost feels like an On/Off switch problem........................

.QUOTE]

mine stopped working at the midrange rpm settings. a dodgy switch i reckon, but haven't bothered investigating further.

 

[Zagato]

I have a mains one and have given it hard use over 3 years, it sounds rough now like the bearings are giving way (if they have bearings!). I don't think they like a lot of work/pressure from the side!

 

[Ian_Edwards]

Quick update

I've taken the Dremel 8200 apart and it wasn't obvious how you change the brushes, the motor housing is pressed together and although I can see the brushes and could probably get them out, I'd probably destroy the motor in the process!

I checked the Dremel website and found the following comment from Dremel

It is not possible to replace the brushes on an 8200 or 8220. These tools have DC motors that cannot be opened. If you wear out the brushes, you should be able to purchase a new motor assembly from Dremel customer service.

The best price I can find on the web is £33.31 +Vat and delivery.

This is not far half the price of a new one and more than a new cheap Dremel look alike.

Anyone else been down this route and found a cheaper way of repairing a Dremel 8200?