About the same as for a hand fabricated setting… 30% to 40% cut
works well most of the time for me.
You might want to re-think cutting the bearings in the model, most
setters are pretty good at that. Even with ‘perfect cut’ stones and
pre-notched bearings I’ll slightly re-cut them.
0.6mm might be a little small on the model, remember the finishing
losses are higher on a milled or grown piece than a metal fabricated
one. At least for milling there are definite limits to what is
possible in terms of very small details dictated by the cutting bit.
A tappered bit can have an almost 0.02mm tip diameter but cuts
tappers, while a 0.1mm straight bit won’t last long.
Down the rabbit hole time… a model accurate to 4 decimal places
has no meaning nor reality.