I assume you mean a mill.( I have a pantograph engraver)
Check all the slides carefully. The travel should be smooth all the way.The joints and pivots are more obvious. The spindle needs to be tight, without side to side play. With one hand on the spindle and one hand on the guide, check out how much play is BETWEEN these two parts, as this gorens how much play will be in your work.Make sure you have the power in your shop to run it,(it may be three phase).
Let us know if you get it, OK? Be Blessed!