Question about Dremel 400 Series Xpr Rotary Tool Kit with Xpr Multisaw and Xpr Planer Attachment 400 - 6/90

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400 XPR - I am trying to remove a saw attachment. The housing cap is completely loosened, but the attachment won't budge. There is no room to use the wrench to9 attempt to loosen it. I have checked the user's manual, but it is not specific. Can someone help me, please?

Posted by tpryse on

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Bob Korsu

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The attachment is 'keyed to the motor assembly so it will only go on in one direction. If it was mistakingly forced on in a different manner it can get jammed. Try twisting it from left to right while pulling straight out.

Posted on Jan 14, 2010

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Those digital dremel's are touchy when the get hard use. learn to use it without the display or try to return it regardless if it spins, it's fine.

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Can't unscrew collet


it is possible that you stripped lock mechanism on the collet, for the beginning, never, ever, use wrench to tighten the collet! just hand tied, if it slips, tight it bit more, but with hands only.

i never used wrench on the collet and never have any trouble with any of my dremels.

to close, just hold firmly in one hand pressing locket button, tighten up with other hand, to undo, reverse procedure.

if you find bit is too lose, then you have collet inserts, find that one which hold bit firmly and use it on this particular bit. standard collet is 1/8" (3.175mm), but in the set there are collets from 0.0394'' (1mm) to 0.177" (4.5mm). do not use wrench...

just inspect now if thread is not stripped, on spindle and on collar, if locket still hold, if these are damaged, you need to change damaged part. and follow the advice :-)

if you find this advice useful, pleasae do not hesitate leave your remark and vote4 for me, thanx!

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1 Answer

It appears that the locking mechanism that is engaged in order to charge out bits has stripped out. No matter how hard I press the button to engage the lock, it always slips when attempting to loosen the...


This can happen if you accidentally depress the spindle locking button while the tool is running -- a common problem since Dremel did not include any type of interlock to prevent it, and the button is right where you'd hold the tool for best control. If that happens, you probably will need to replace the tool or send it to Dremel for repair.

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1 Answer

I have a collet nut that will not loosen. at one point while turning the shaft lock button pops up; even when pressed


Sorry, but I seem to have ( essentially ) the same problem... no positive lock. holding the button down while rotating the shaft to find the "best hold" then applying extra pressure sometimes helps. I had no problem with an older model. 400 XPR also seems to overhheat badly.
My ultimate solution: purchasing the model 4000.

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1 Answer

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Could be the brushes burned out. Don't panic, they are user replaceable. If you have the user guide it should explain exactly how to do it. If you don't have the guide you'll first need to get a set of replacment brushes from a larger hardware store. Make sure to get brushes for your model. On the side of the tool are black slotted caps that can be unscrewed BE CAREFUL THE SPRINGS UNDER THE SCREW CAP CAN GO FLYING. With the cap removed the old brush will fall out and can be replaced with the new one. 2 brushes, one on each side are needed. The 400XPR is a newer model so if this doen't repair it, there may be a defect in the tool.

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1 Answer

Flexible shaft not working all-in-one rotary tool


check and see if you have the right collet insert in the chuck if it is too big it wont lock the shaft. does the chuck turn? if so your collet is not locking the flex shaft

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Help. Cannot remove the nut on the dremel


HELLO ,you must keep your thumb on the push button while trying to loosen the nut it sounds like your pushing the pushbutton in and then letting it go as you try to loosen the nut , i also have a dremel and i made the same mistake when i first got my tool , Hope this truly helps you get it off , I thank you for letting me try to help you Sincerely Glenn

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