"Larry W"
wrote in message
I'm surprised that no one has yet mentioned
(unless I missed it) the old
trick of using a ruler, selecting a number of
arbitrary evenly spaced
markings corresponding to the number of holes
needed, then angling
the ruler diagonally across the workpiece (or on
a bench where the
workpiece is laying, if necessary) until lines
drawn perpendicular to a line
parallel to the holes match up with the selected
ruler marks. No
math or arithmetic necessary. Unfortunately
easier shown than explained,
but some older woodworking books have pictures
of the technique.


This method has been mentioned. The problem is
that even though
the hole centers are spaced equally the spaces
between the holes differs.
i.e. The space between the left border and the
first hole as well as
the space between the last hole and the right
border are twice the
space between the other holes. It's up to the OP
to decide if that is
acceptable.
phil k.