I am usually checking to see if I can convert a motor from 110 to 220 and not the reverse. Most motors have more torque and run cooler on 220. However, if you are sure you need to go backwards, some motors are wired for both voltages. The only way you will know is to take the motor connection box cover off and check the wiring schematic that is supposed to be attached to it or possibly at the motor specification plate on the side of the motor somewhere. The schematic will show how to change the internal wiring and the spec plate will probably show 110/220 where the voltage is specified. You should be safe with the motor phase. I don't think Sears ever sold anything that was 3 phase. Your photos are incredibly blurry so they really aren't much help but the first one appears to be a standard 110 volt plug in.
I had a Sears table saw that could be converted and a friend had a radial arm saw that he had converted so it is possible that it could have been. it's also possible that the owner did it and to save money he used a standard plugin on it. The 220 volt ones cost more. Be absolutely certain what you have before you plug it in.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
Last edited by Cherryville Chuck; 09-21-2014 at 08:04 PM.