We've used the tooling from Buehler Nelson-Zimmer system with success, bigest issue is vias (typically 75micrometer and smaller) where the actual location of the via in the pad can't be readily determined visually (which is necessary to align tooling).  Were we can locate them the system works well.  If we can't see the vias (or more properly a "dent" in the pad) we section at a slight angle to the via to via centerline and figure, covering a range of potential via positions and usually get 2-4 "good" cuts.

We have also (in "one up" cases where setting up the tooling isn't justified) done the "grind till ya find it" technique which is tedious.

Jim

> ----------
> From:         [log in to unmask][SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         Wednesday, December 08, 1999 12:31 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] microsectioning equipment for microvias
>
> We also use traditional methods - tedious - but can be done
> Would not process 30 sections in one mount and 9 mounts in a head
> like routine through hole production.
>
> Susan Mansilla
> Technical Director
> Robisan Lab
>
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