Originally Posted by Numb Nut  Ah Andre' B - just saw your post - that makes sense I guess.
That just leaves the corner thing - why does that need to be rounded and why does that help? I really don't understand how it ends up rubbing instead of cutting when used for facing...  |
Look at the End of the End Mill. You will see what appears to be a 90 degree angle which is actually concave if you were to cut it in half.
Here is a pic of an Bull Nose End Mill for reference. This is the edge you will be slightly honing. It is designated with an "R".