Do you have access to a machine with a table that moves laterally? i.e. a
Bridgeport would be perfect. If so, lock the tube down and index it
perfectly with an existing drill bit. Then move the table X inches, drill,
repeat process.

....Or buy a multi-spindle drill head and do all the holes at once. Pricey
unless you have LOTS of units to do, but the best answer if you will be
doing this all day for a while.

Joe - V#8013 - '86 VN750 - joe @ yunx .com
Northern, NJ
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"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?