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I've had my Dremel 4000 for over a year, and I've never had trouble with it. Recently though, I've noticed that the tool gets very hot after only a few minutes of use, and sometimes there is a faint burning smell. It functions well enough before it gets hot, and I don't hear any grinding when it is running. Any insight is appreciated.
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Hi @travis I have the older model of that dremel and they both work about the same and even my dremel does the same thing as you described which it gets really hot really fast at times and usually this means that the air vents are clogged up with stuff and it looks like this model has the vents closer to the tip of the tool. So my solution is either take air in a can or an air compressor and blow into every opening of the tool. My second solution is replace the brushes and here is a link for how to replace them http://www.quality-handtool-review.com/d...
Now here is a link for the replacement brushes http://www.stewmac.com/Luthier_Tools/Typ... now if you do all this and your dremel still runs really hot then your cooling fan is not working right and that is something I just realized can be replaced here is the link to that http://www.ereplacementparts.com/armatur... and here is a diagram on how to take the dremel apart http://www.ereplacementparts.com/dremel-....
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You cook good rabbit pilgrim, you've come far. https://www.youtube.com/watch?v=95ND_fwX...
Thanks @mayer I couldn't have made my answers better without your help.
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I am finding it beneficial to keep a sock loosely around the body of my 4000. A old dress (thin material) shoe sock works well. Keep the knitted elastic band of the sock near, but not covering, the fan exhaust holes. You will see the sock captures dust that normally might be inhaled into the tool at the lower end. I believe this keeps the tool running cooler and longer overall.
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When building PC's, it's an old trick to use womens nylon stockings as dust filters on the case intake fans. They have very little air resistance and are extremely easy to fit, clean or replace. I'm sure they would work just as well on a Dremel.
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