On 15 August 2011 12:28, John Thornton <bjt...@gmail.com> wrote:
> If you want perfectly round holes get a boring bar.

In some cases a boring bar will work less well than
backlash-compensated spiral milling.

And in the case of a Mini Mill (and this is a Mini Mill) the
head/column stiffness is very different in X and Y directions, so you
get ovality even with the slides locked. This can be partially
compensated by taking tiny finishing cuts.

-- 
atp
"Torque wrenches are for the obedience of fools and the guidance of wise men"

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