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Thanks for everybody's help and suggestions. Now resolved.

1) Ron asked a great question in the very first reply to my post: "Are the gibs tight?" They gibs were tight, the literally gibs in...

Yep. X and Y locked, Z as tight as I can get them and still advance.

Also, I shouldn't have said "the entire thing" wobbles; I should have been more specific: Column, gearbox, etc, seem stable...

I have a Charter Oaks Automation Square Column mill with the factory 3-phase motor and VFD controller. Which works quite nicely, by the way.

I have a symptom where the spindle runs with very...