I found several posts on this topic here on SMC. Yesterday after doing a little cleaning and organized after my recent project, I installed two new CBN wheels (80 and 180) on my woodcraft slow speed grinder. I sharpened around 10 turning tools and was ready to stop when I noticed a electronic type smoke smell. The grinder was also very hot to the touch, and had smoke coming out of each side of the motor housing. I sharpen with very little pressure and no stalling or slow down of motor. I was worried enough to put the grinder outside in case it caught on fire.
Today, I decided to try it again. I did give the wheels a hard tug to get them moving and then turned on the grinder. It was running for about 30 seconds and still didn't come up to full speed.
Does this sound like a dead or dying grinder or possible bad capacitor.
I have attached two pictures, one of capacitor and one of back side of grinder with wheels attached.