Are you drilling in a lathe, mill, or drill press? What kind of drill &
fixturing,,Jacobs chuck, morse taper drill, ?? Is the drill new or has it
been resharpened? Are you center-drilling prior to drilling? Is the work
being moved after the center-drilling or is it done sequentially? How are
you feeding the drill, and at what feed rate? Higher feed rates = more
error.

With a proper setup I would expect you should do better that 1/32" that you
are getting now.

Tony
"Bill Chernoff" wrote in message
news:%q3Ac.732915$Pk3.3341@pd7tw1no...
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