I have a Ridgid 1/2" hammer drill....The big model with a cord. It was new two years ago and has seen very little use. The other day I was drilling holes in my foundation for some tapcon screws and had the drill in the slower of the two gear speed settings as well as in hammer mode. It was getting it done but slowly, so I set it into the faster of the two speeds. I was surprised to see lots of sparks coming out of the vent holes that surround the motor. I mean the sparks were coming out 2-3"!!!
I'm going to take it back or at least call Ridgid to see what their lifetime warranty will do for me, but does anybody have any idea what would cause this? It hasn't had more than a total of 15 or 20 minutes' use in the two years I've owned it so I can't imagine it is worn brushes if it even has brushes.
it's a Rigid is the main reason. Most likely you stored it in a unconditioned room or an area using an unvented heat source. Therefore moisture accumulated on the brushes. Replace the brushes and you should be fine.