On Tue, 28 Oct 2008 18:50:38 -0500, "seelyjv"
wrote:

John,
What you are trying to do is, for all practical purposes, an impossible
task.

Yep. Pretty much what I've concluded.

The cumulative error you build in when going from hole to hole is
killing you. For an example, look at the 96 hole index disk. That's 360
deg. / 96 holes or 3.75 degrees per hole. But, if you are in error by only
0.05 degrees when you drill the first 2 holes, the cumulative error over 96
holes is approximately 1 degree - or about 1/4 the distance between two
holes. .05 degrees is a very small error when drilling holes with even very
high quality machine tools.
Jim Seelye