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[gingyer]

Hi all,
I have a Dremel Multi tool model 395. Bought about 1998/99.
It’s starting to seriously loose power, even on full speed I can hold it and stall the motor with my hand 


I have changed the brushes and still the same.
Does anyone have any ideas of what can be wrong, or am I correct in thinking it’s just got to it’s end of life??

[rnli12]

I am guessing the motor windings are deteriorating or clogged up.

[mogurnda]

Gingyer....                   Bought in 98/99.... Do you not think that it is done...... have you not had your monies worth from it... Me thinks that it is time for a replacement... You surely cannot have any complaints that you only got 24 years of use from it.     Seen on FB market place.
Cheers David. 

[J.beazley]

My Dremel is some 18 years old too.
The only thing i have replaced due to motor stalling is the speed control slider which did the job, i cleaned everything while i had it apart works like new everytime its used


Jay

[chas]

Possibly a daft question, you did clean the commutator on the motor when you changed the brushes I presume.
  One other possibility, what is the power supply? have you checked it with another motor? A dying battery or a transformer supply with part of the rectifier going could do what you describe.
Chas

[gingyer]

Hi all,
its 240v straight from the mains.
I checked the windings and commutator, I stripped it down gave it a clean.

Gingyer....                   Bought in 98/99.... Do you not think that it is done...... have you not had your monies worth from it... Me thinks that it is time for a replacement... You surely cannot have any complaints that you only got 24 years of use from it.     

Absolutely no complaints I have used it a work also not just my modelling but....
the newer ones are not to the same level as the older ones so IF i can get it going again then ideal

[gingyer]

My Dremel is some 18 years old too.
The only thing i have replaced due to motor stalling is the speed control slider which did the job, i cleaned everything while i had it apart works like new everytime its used


Jay

interesting... I will get a replacement and give it a go 

[Corposant]

I agree with Jay - the speed control circuit is by far the most likely culprit. My Dremel is over 20 years old and only the speed control has failed. (In my case, I get full speed all the time - but I live with that!)


Regards,
Mike

[nemesis]

If it is from the mains try running it direct, not through the ESC. That will show whether it is the motor or the ESC. nemesis

[minimariner]

                 I would not try this if it is a DC Brushed Motor.