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June 1998

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Date:
Mon, 8 Jun 1998 17:25:21 +0000
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It has been my experience that cracking in "harder" material can be
solved with an undercut drill with slower than normal infeeds.  There are
also some "alternative" drill designs available on the market that work
quite well in this situation.  If you would like contact me off of the
TechNet at [log in to unmask]  I wish you luck.

Mark R. Ford, Application Engineer  -  Megatool


On Mon, 8 Jun 1998 15:42:01 +0100 James A Larson <[log in to unmask]>
writes:
>Has anybody experienced Radial Cracking as viewed from a
>horizontal section or Fishscale cracking as viewed from a
>vertical section using Cyanate Ester Resin.  This resin system
>is used to fill a 2 oz. copper plane layer in a 8 and 10 layer board.
>
>If so what parameters have you compensated for to help
>minimize this situation?
>
>We've modified  press parameters and drill parameters with
>minimal success.
>
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