On Jul 5, 11:14*pm, Dave99 wrote:
I've been looking for a more accurate way to drill sets of holes 90
degrees from each other through round tube.
Dave

A simple way is to clamp the tube into the vee of angle iron and
locate off the two flat sides. You can find the center by lightly
pressing the middle of a 6" ruler against the tubing with the point of
a drill. The drill is centered when the ruler sits level.

That gives good drill-press accuracy if done carefully, but nowhere
nearly as accurate as a milling machine and an index or collet fixture.