My interpolated holes are slightly smaller at the bottom.
So a cylinder that will slide in snuglly from the top won't fit from the other end of the hole.
I don't think this has anything to do with deflection because tried multiple finishing passes.
If the spindle were running out, that would make a bigger hole.
If the spindle were at an angle, the hole wouldn't taper.
So what's going on? Does this mean that the milling bit is smaller at the tip?