I have one of those ubiquitous 36" belt/6" disc sanders. I've put a lot of miles on it.
It's starting to develop a really horrible vibration problem. Used to be, I wouldn't bother putting on my ears just to run this machine by itself. Now it has become quite obnoxiously loud.
It sounds like it's binding, building up some tension on the belt, and then releasing it with a loud, hollow THUNK. I can see the powered roller jolting in time to the thunking.
Obviously, something's out of whack, and I need to figure out what before the poor thing shakes itself to pieces. I tried to take the machine apart, but failed to get the disc off, and that was as far as I could get. I removed the set screw and even resorted to prying on it a little with some suitable probe, but it's stuck fast, and there's nothing but the plastic shield to pry against. I don't want to damage my machine, and there's nothing useful in the manual to give me insight here.
Has anyone encountered the thunking problem? What was it?
Does anyone have any handy dandy tricks for getting the sanding disc off? I just put on a new piece of sandpaper not too long ago, and so I haven't yet resorted to pulling it off. I don't remember there being anything to find under the adhesive disc other than a featureless machined surface.