Does anyone hard turn on older Mazaks?

I have some products I'd like to get into that involve hard turning 3" D2 @64rc on a 96' SQT15MS.

My spindle isn't the greatest, so I'll likely have it rebuilt after the holidays.

Theres no backlash in my screws, and I can't find any movement where it shouldn't be in any axis.

Does anyone do any hard turning on their older Mazaks with good results?

I need to hit a sub 16 micro inch finish for a needle bearing surface.
Is something like that achievable?

Thanks!