A surprising story that might be pertinent.

I painstakingly rebuilt a 1959 Rockwell 12" disc sander. I believe all original parts...certainly looked that way. At some point during reassembly I realized the disc was out of balance to the point of shaking the machine. Not violent, but not what I'd call acceptable either. I had disc balanced and faced at an understanding motor machine shop. Silky smooth after that, but I found minimal uses for it over the 18 or so years I owned it. Just recently sold it.

Two things surprised me. First, that it was apparently never balanced from factory. Second, it didn't get used all that much over the years. No disc sander in shop now and I would have to have a specific use if I were to dedicate space for another.

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