Ralph,

You said:
> I also mention that a good design, where long-term reliability is a
> serious design requirement, does not have closely spaced (~1mm
> edge-to-edge) of plated-through holes on the same grid lines to where
> the reinforcement yarns bridge the spacing between holes.  It is better
> to off-set the plated-through holes either diagonally or such that
> plated-through hole centers are on a grid that is greater than half of
> the sum of their hole diameters.

Does this mean that a 0.016" finished via, drilled at lets say 0.021", would have a center to center spacing of 0.060 minimum  (0.039 + 0.021 = 0.060) ?

---------------------------
John Laur
Rockwell Automation
Allen-Bradley Co Inc.                 
1201 South Second Street
Milwaukee, WI 53204
+1 414 382 2162 (fax)
+1 414 382 2393 (phone)

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