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Dremel belt/disc sander

Cannot run sander without breaking the belt.  Tried adjusting belt tension, but not sure how to adjust it so belt doesn't break a few seconds after turning on the machine.  Belt was adjusted so that it did not run off the pulleys, so this is not the cause.

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  • Anonymous Mar 19, 2014

    Keep putting belt on and belt comes apart where it's glued. I'm thinking maybe it's the glue

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  • 29 Answers

See the manual

Posted on Nov 06, 2008

  • clydelascruc Dec 20, 2010

    If I had the manual I would read it.

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Craftsman 315.117150. The belt keeps sliding off, as soon as turned on and start to sand. It seems to be on correctly.


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Check first that you have retensioned the belt... i.e. when you removed the other belt, you would have had to pull on a spring-loaded lever to remove the belt tension before you added the new one... make sure the tension lever is flipped back in to ensure the new belt is tensioned...

Next, and the likely problem you are having, is belt tracking... There should be an adjustment knob up near the front of the sander near the front roller, either on top of the front part of the sander, or to the side near the front roller... When you turn this knob, it makes the belt track either left or right over the sander's base. This knob will allow your belt to run square and true and not spin off to one side...You need to adjust the tracking using this knob while the belt sander is running and with the new belt tensioned and in place, so turn the sander upside down, and power it on with one hand, then turn the knob with the other hand whichever way is needed to have the belt track square and in the middle of the rollers. Make small adjustments on the tracking knob to begin with. They can be sensitive at times.

That should stop your belt spinning off to one side.

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1 Answer

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Check and see if the pulleys on the sander are not glazed this somtimes will cause the belt to slip. Give them a good cleaning. If this does not help there is a good chance the spring on the belt tensioner is weak and need changed.

Hop this helps

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There should be a knob on the front of the sander which adjusts the front roller on the sander. If the belt runs off in the same direction each time try turning the knob as the sander is running and while watching the belt. If turning the knob one direction does not work try turning the other direction. If turning the knob does not have any affect on the way the belt tracks on the sander then you probably have a broken or missing part on the front of the sander. This may require taking the sander to a service center.

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