20 Most Recent Dremel 400 Xpr Rotary Tool Questions & Answers

1st ck to see that outlet has power on it by using a known good light (drop lights work great for this) next if tool is plugged into a foot pedal or speed control remove this and connect direct to outlet , activate switch on tool see if it runs

if not you most likely have a dammged brush on tool <this is very common i usually go thru two sets a year , brushes are available for dremels where ever dremel brand bits and tools are sold ck on back of package for your model number

if doing a lot of sanding or grinding allways make a habbit of blowing out air vents on tool body with a strong source of compressed air (canned air ok) this helps keep it going for years

Dremel 400 Xpr... | Answered on May 22, 2015


Dremel 400 Xpr... | Answered on Oct 28, 2011

I would hate to try to jam something into the fan, so I think it would be safer to split the case open and then put the armature in a vise. I am pretty sure you can still do that with this model.
Another alternative would be to use an air impact on the collet, since it works on inertia and does not need the shaft to be locked. Of course then you would need to be able to slip a socket over the collet hex part, and you may have to cut off a bit in order to do that.

Dremel 400 Xpr... | Answered on Feb 28, 2011

It's heating up and tripping the internal overload. They do that to prevent the battery from overheating.
The cordless are nice but they have limited applications

Dremel 400 Xpr... | Answered on Feb 23, 2011

you can try going to "dremel.com" and downloading the manual, also there they have a toll free number for tech support which might be able to send manual as a PDF file. Let me know if you have trouble finding it and I will come up with another source

Dremel 400 Xpr... | Answered on Feb 14, 2011

Hello jeremy. Begin by getting a can of penetratin lubricant such as WD40 and applying it to the collet and the surrounding locking mechanism. Let it sit for an hour or over night so that the lubricant can penetrate.

Next use a hammer to tap on the hold button a few times. This step will remove any fine dust that may in it and preventing it from seating properly and doing it's job.

Finally, if it is still frozen, use a pair of locking pliers, like vise grips to firmly push in that hold button. Joe

Thanks for choosing Fixya!

Dremel 400 Xpr... | Answered on Jan 26, 2011

Put it in a liquid solvent that can take the dirt out of it if not buy a new one.

Dremel 400 Xpr... | Answered on Oct 14, 2010

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