Question about Porter Cable 3" x 21" Electronic Variable Speed Sander

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Dust collector why would the sander stop collecting the dust?

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  • Anonymous Mar 27, 2014

    can't figure it out. thanks

  • Anonymous Mar 30, 2014

    In need of a dust collector bag



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Dust collectors usually work off the motor via a fan. Either the fan is broken or the bag is blocked up.If the bag is too dirty inside you don't get any airflow through the bag which can stop it collecting. A good wash should do the trick

Posted on Sep 19, 2008


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Plugged into vacuum...Done.

I haven't had this happen before but after looking at the parts diagram for your sander it looks as if a short has been created in the coils of the electric motor.
The sander is designed with a fan physically attached to the motor to assist in blowing out dust residue either into the dust bag or into a dust vac. Although adapters are sold to decrease the diameter on dust collection systems tubing i would guess that the total CFM's far exceed what Ridgid expected during engineering. The adapter port was most likely intended to be plugged into a small 5 to 10 gallon shop vac which won't generate the 650 and up CFM's that most dust collection units have.
So when the motor was attached to the dust collection unit the suction was probably turning the motor past what the electrical current was intending the motor to do, thus creating a short.
As for the fix. You can go through and get a replacement motor, or have the motor rewound and repaired by a specialist.
I would either leave the fan off of the motor shaft if you want to connect directly to the dust collection unit, not attach directly to the tool, or drill several large holes in the adapter to allow the cfm's to bring in air from around the tool as well as through the motor casing.

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1 Answer

Should you oil head on 6" Fein random orbit

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Sander was running and then just stopped running and now it wont turn on. Does not smell like it burnt up there was some dust in the moter, but i think thats going to happen.

I had the same problem with mine. The problem was dust build up on the motor brushes. I would suggest, if you haven't already, cleaning the brushes.

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1 Answer

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