Question about Dremel Variable - Speed Multipro Rotary Tool 395

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Dremel rotary tool variable speed, low speed speeds up after short use. Will brush replacement solve this issue?

Low speed sometimes doesn't engage or speeds up after short period of use.

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How stable is your line voltage? The SCR phase control used for speed control is more sensitive to line voltage changes at low speeds than at high speeds. Brushes should be changed when they are worn down to about 1/2 of their original length. Much more than this and they don't have enough tension to properly contact the commutator ring. Check with power off when the tool is cold and slowly turn the chuck by hand to feel the resistance. Run it a while and let the bearings warm up. Turn off power and turn by hand again. If it feels looser when warm (which would cause it to speed up at slow speeds), the tool might need to be disassembled and bearings oiled. I use Dexron automatic transmission fluid to lube most motors. Wipe down any excess.

Posted on Nov 29, 2014

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Posted on Jan 02, 2017

  • 7 Answers

SOURCE: How to replace brushes?

On either side of the switch is a black disk with a notch small enough for a small screwdriver. Unscrew it and take it off to expose the spring. Gently pull the spring out and the brush should be attached. If you encounter resistance, then you may disconnect the spring from the brush. If this happens then push the spring back in and hope you catch the brush; if this does not work, then get creative or take the whole thing apart to get to it. After that, just put the new brushes in and recap.

Posted on Aug 03, 2008

mikedem7
  • 25 Answers

SOURCE: have a multip speed dremel 350

clean the slots that hold the brushes, sometimes they get cloged and the springs do not push the brushes all the way to the armeture.

Posted on Aug 19, 2008

rowdy45176
  • 2176 Answers

SOURCE: Variable Speed Does Not Work - Model 395

It probably can be replaced. For info on this tool call 1-800-437-3635 (Dremel) and speak with customer service about a replacement part. Hope this helps

Posted on Dec 24, 2008

  • 218 Answers

SOURCE: need new variable speed switch for dremel 395 type 1

Someone else recently asked the same question and got the following solution;

http://www.fixya.com/support/t1515699-variable_speed_switch_dremel_395_get


Posted on Jan 29, 2009

joboo1
  • 257 Answers

SOURCE: Cordless Dremel variable speed stuck on maximum

Hi, There are several dealers in London who can help you solve your problem. The following link is has a list of those dealers with addresses and phone numbers:
http://www.dremeleurope.com/dremel/dealerlocator/index.cfm?lang=en-GB
Good Luck to you, this should Fixya!

Posted on Mar 02, 2009

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2 Answers

Will not turn on. Bushings are fine/replaced.


Problem is more than likely that the plastic brush holder got hot with continuous use and the brushes n longer slide smoothly in their housing. Sometimes they even twist a little. The only solution to this is to replace the brush holder-variable switch assembly.
DH

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Trying to jerry-rig the switch like that could cause a more serious issue, like burning up the drive motor, etc.

Here's a place that has replacement parts (and a nice exploded drawing of the tool too) that should help you out. If the part isn't currently available from them, you can search elsewhere for another supplier.

http://www.ereplacementparts.com/dremel-400-xpr-variable-speed-rotary-tool-parts-c-15440_15456_15610.html

The switch part number is 2610920711.

Hope you find this Very Helpful and best regards!

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http://www.dremeleurope.com/dremel/dealerlocator/index.cfm?lang=en-GB
Good Luck to you, this should Fixya!

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Variable Speed Does Not Work - Model 395


It probably can be replaced. For info on this tool call 1-800-437-3635 (Dremel) and speak with customer service about a replacement part. Hope this helps

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