What you should do is find out what is presently fed 460v, Any three phase motors can usually be changed to 220, the wire size and overloads would need to be checked to take the higher current.
The control transformer is probabally going to be single phase to 120v, check if there is a 220 v primary tap or change the txr to 220/120.
Spindle and servo drives are often 220 and have been transformed down, so you may be able to eliminate the intermediate transformer for these.
You really need the electrical power prints to make in informed decision. But often it can be a relatively cheap route.