Re: [CAD_CAM_EDM_DRO] Flat Holes

There are a couple of things you can do. One is to use a standard drill and
then use an end mill to finish the bottom. The other is to drill the hole
with a standard drill and then use another same size drill which has been
altered to cut a flat bottom. To make a flat bottom drill, first you grind
the end flat and square with the axis. Next you file relief angles on the
flutes.

Smoke

> Is there a special type of drill bit to make holes with perfectly
> flat bottoms? All the drill bits I see are somewhat tipped. I want to
> make flat-bottomed holes so I can recess socket head cap screws.
>
> -GM4T
>