Three phase will cost a lot. There's also going to be a premium
to pay if you try to get service that's over what they consider
"standard household" - especially if the local transformer
and feeder won't handle it.
If the only 3ph equipment you have in the shop is the Bridgeport,
you can get by with a homebuilt converter. The experts hang
out on rec.crafts.metalworking.
Remember, the service into the box doesn't have to be the sum
of the breakers in the box!
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