Try some parabolic flute drills, make sure they are long enough to still
have some flute outside of the hole. Start with proper center drill and
that the surface you are drilling into is level. clamp the material down
so it cannot move while you are drilling, same for the table.

Bill Chernoff wrote:

I am drilling 13/64 holes 2 inches deep in 6061. The bottom of the hole
wanders as as much as 0.020-0.030 off center. What is the best straightness
I can hope for on a hole that size, that deep?

Any drill sharpening, etc, hints?

Thanks




--
James P Crombie
Slemon Park, PEI
Canada
Machinist - 3D Cad Design - Amateur Astronomer

http://www.jamescrombie.com