The statement that greater skill is required to microsection vias with a
0.010" diameter or less is true.  For the labs with skilled technicians,
these vias can be ground to the center of the hole using
auto-microsection equipment or by hand.  The choice is what is most cost
effective for the lab to do.

Merix tools several rows of vias on a 5 degree angle. This tooling
practice increases the likelihood of grinding to the center of at least
one set of vias and permits the use of the auto-microsection equipment.
If you miss the centerline of 1 set of vias, you can proceed to the next
set with minimum labor.  By tooling several rows, we are able to inspect
several vias for quality.

This tooling approach has worked down to 0.002" diameter vias.

Regards,

Randy Reed

Analytical Lab, Merix Corporation
Forest Grove, OR
503.359.9300  x5-4421
randy.reed @merix.com

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