drill starter hole with drill bit
feed plunge with roughing endmill
chip break plunge with roughing endmill
start ramp with hammer and cold chisel
I'm actually totally out of my field of expertise. ( NEED a starthole for cutting pockets on the EDM). But if i was to mill i would take the helical ramp option, especially on materials that's tough on cutters....
Klox
*** KloX ***
I'm lazy, I'm only "sparking" when the EDM is running....