"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:

Tom Gardner Mars@Tacks fired this volley in news:r-
:

The holes don't have to be burr-free but I would like to
minimize the burrs without any secondary operations.

Tom, you can't eliminate the "breakout" burrs. Use the fastest feed you
can to get a clean chip, and you will almost completely eliminate the
burrs at the top of the hole.
If the work is clamped securely, you can use an end mill to drill
through. It leaves a lot less burr than a regular drill bit.

Jon