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The Dremel 4000 is a variable speed rotary device. It is compatible with with all Dremel rotary accessories.

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Dremel4000 loud and excessive vibrations above 2500rpm

Got it used and clogged with what I assume was drywall caulk. I took it apart and detailed it. but now after reassembly I get severe and excessive vibration in the unit and can’t even use it above same level 5/10 and that is really uncomfortable. The bearings are good as they don’t appear to have any wobble or grinding when in my hand. this is only happening at higher speeds as well. I was thinking about adding tape around the back rubber bushing but does anyone have recommendations for the front? Should I remove the bearing seal and put a couple drops of gun oil in each bearing?

Any help greatly appreciated!

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I did check. And these seem never to be well balanced sadly. I'll probably place semisoft foam around stator and bearing will get plasitic shims. Only thing I can think of

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Hi @stressmaster ,

Just some thoughts.

I have rebuilt a number of compressor motors but not Dremels.

Sounds like some one used it where not really designed to be used.

Did it vibrate before you cleaned it?

The oil would only be a temporary fix but yes try that. Take a look as it may not need oil.

Could also be a bent shaft. Do the bits spin without a wobble?

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Could definitely be a bent shaft.. that would unbalance it for sure

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it sounds like something may be out of balance on it. Check and see if something got missed in the cleaning, or maybe something broke off?

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stressmaster estará eternamente agradecido.
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