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5HP and 3-phase is serious overkill for a buffer. Assuming you don't already have 3-phase, you'd spend more buying the equipment to convert it, than you'd spend buying a ready-made buffer. A cheap 5HP VFD is $300 or so.
Also keep in mind that those machines will have a 1-1/4" or 1-1/2" shaft, meaning you have to buy special buffs or cut the centers out of regular buffs. Not a big deal, but not really a big help, either.
Doc.