Hello. I am trying to get a number on the worst case part tolerances to expect on a Taig Ballscrew Milling Machine?

Lets say a 2" diameter part cutting a cylindrical shape in 6061 Aluminum. How close +/- to round would you be willing to assert you can repeatably perform day in and day out?

I am not asking how to cut a cylinder, I am trying to determine the Taig's capabilities. I just thought that a path such as a circle would stretch the machine's capabilities thus tell me what to "expect" from the machine. I say this as I don't want to get the advice to ad a rotary table, I want to know the machines real world capabilities and expectations, assuming it is set up properly.

I have searched over two hours to find this data, but to no avail. Perhaps I just don't know the right question to use in my searching.

Thank you for your help. -Mike