When I need to chamfer a bolt hole, I use the following formula:
(Chamfer Diameter - Bolt Hole Diamater)/2/tan(Chamfer Degree/2).
I add this amount to the distance my chamfer tool travels into the bolt hole before scraping the sides. That becomes my negative Z depth.
But suppose I want to use a ball nose end mill to do the chamfer. Does anyone know a formula for calculating chamfer depth when using a spherical raidus like a ball nose end mill??????