Larry Jaques fired this volley in
:

I'm a newb to milling, but I'm certain that if you push a small
diameter milling bit to deflect by more than its own diameter, you're
pushing it -way- beyond the proper feed speed. Slow 'er down, duuuude.

It was a stupid, uninformed comment, Larry. You DON'T push endmills to
deflect by their own diameter, or they break... period.

That is, unless, like the poster's machine, the spindle or Z slide is so
sloppy that IT deflects more than an 1/8" under load! G

Lloyd