Nobody could splain it better than this

Subject: aligning holes in tube
From: Robert Bastow
Date: Fri, 28 Aug 1998 04:34:30 GMT

The good 'ole eyeball will never let you down.

Assuming that you are using a drill press and know how to align and
clamp down a vee block to said drill press table.

Drill your first hole and swap ends. Now put as long a piece of close
fitting rod as you can get under the ceiling,through the first hole.
Drop a plumb line somewhere beyond it and eyball the rod to the plumb
line. It will be plenty close enough for almost any purposes.

This does assume that your drill press is somewhere close to being
perpendicular. You might want to eyeball it with the plumb line
first.

Robert Bastow

He saved me a lot of struggles
Glenn
"Miki" wrote in message
oups.com...
I tried searching, but couldn't seem to come up with the correct search
term. I'm quite sure this has been discussed though.

If you have a tube with a hole drilled in it radially, and want to
drill more holes exactly in-line with the existing hole, how would you
do this on a drill press? Finding the center of the tube is the easy
part, but how do you know you have the tube "clocked" correctly on the
V-block?