Uh no. The accuracy of the spindle is the ratio of the column to
spindle divided by the column to wall. For your example of 8" and 60",
..001" on the spindle would be .0055" at the wall.


B) Consider that the spindle is perhaps 8" away from the column
(not too unlikely, given the size of the machines which
typically have round columns).

Assuming that the wall is perhaps five feet from the column
(60") then 0.001" at the spindle becomes 0.060" at the wall.
(And five feet to the wall behind the operator is not that
unreasonable, especially if there is another machine tool, such
as a lathe, on the other side of the aisle.

Enjoy,
DoN.