In Machine Tool terms...this is like asking, "Has anyone ever done open heart surgery?"
Yes people have, but it is not something that you learn to do in a conversation.
I repair Doosan (Daewoo) machines. I can tear it all the way down to a pile of bolts and put it back together correctly...and it will work correctly and accurately.
Even I do not rebuild spindles. They require more precision and tighter specs than any other component on the machine.
Could I rebuild a spindle? Yes.
Would it be perfect? I doubt I could do it perfect, even with the knowledge at my disposal.
Doosan has rebuild department that good prices and quick turnaround, and factory specification quality.
Call: (973) 618-2500 for more information.