Stephen Newell
Well-known Member
I have two porter cable random orbital sanders which when sanding the RPM drops a lot and have to stop and allow the speed to pick up and I'm not putting too much pressure on the sander. The longer I work with it the harder time it has to recover the speed. I attempted a fix and bought new brushes for it and took it apart and cleaned the commutator and the sander works good for a couple of days and then does the same thing. There isn't excessive wear on the commutator however as long as I take the sander apart every day or so and clean the commutator the sander will work fine. Is there any fix for a sander like this other than replacing the armature.