Okay i understand the drive alittle better now. VFD only if the current drive is retrofit to a single 3 phase motor?Couple quick comments:
You can't run the 10EE with a VFD unless you replace the entire motor-generator guts with a new motor (which you may end up doing if there are problems). You may want a slightly bigger RPC than 5 HP, say 7.5HP, to run the 10EE? That's a close call, 5HP may work fine. The bridgeport would definitely benefit from a VFD conversion as it would reduce messing with the belts for speed changes.
How much can you find out about the current status of the machines? Were they in a hobby shop? If so how were they powered there? Is the previous owner available to ask?
They were powered using commercial 3 phase, they are from a plant... used for repairing molds and whatever else needed servicing, not daily use.