Uncommon, sure. Maybe even never done: but, it would very hard to rule out that some single-minded smith , living close to a transmission line of the right voltage ( which would mean a city, of course) would never get an electric motor and rig it up to drive a lathe. But, this is even before the first US electric streetcars....far, far more likely, though, he would have a foot-powered one or, if he needed something of size, something steam-powered ( a gas powered hit-and-miss engine would have been possible later, in the 1890's): but then, he would have a steam engine powering a line shaft driving probably a few machines- a drill press, a grinding wheel, a shaper, and a boilerman to run the engine...in short, he might be setting himself up to be machine shop as well, and that would not be entirely unusual. By this time, blacksmiths were no longer usually the makers of locks and hinges, brackets, etc. that they had been 50 years before. Industrialization had made those factory products. Instead they were doing repairs ( a mine would often have a blacksmith sharpening drill bits and repairing broken machinery) shoeing horses, fixing wagons...and as forging and forge welding would often be a handy solution to any fabrication problem, a fabrication/machine shop might well have a forge.