We are lucky to be co-located with a semi-public bike framebuilding workshop (with overlap between members of each), so we have a full suite of handheld power tools (drill, driver, angle grinder, sawzall) that all get used, as well as a metal lathe, oxy-fuel torch, and TIG welder. The TIG welder gets used a number of times each year to weld sockets onto particularly stuck bottom bracket cups, and both the TIG welder and the lathe get used occasionally to make/modify/repair tools. We also use all that stuff to build shop infrastructure (rolling carts, repair stands, mobile bike shop on a trailer, etc.).
rosy, at Lefty Loosey Bike Collective in Providence, RI, USA