Shop air dilemma

Three phase is not that hard or expensive to accomplish at home. There are a lot of three phase vfd’s that will run off the single phase 230 you probably have in your panel. I have built two rotary phase converters that cost me a total of $150. The 5hp is in the garage and 3hp in the basement. Cheap motors off CL and relays and other control parts from eBay. If you are really cheap you can use a rope pull to start them but I like the button start option. Beauty of a rotary converter is I can run multiple machines at same time as long as total hp is below the converter motor.