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| From [log in to unmask] Fri Jun 7 09: |
45:11 1996 |
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Lyle,
Is it FR-4 or Polyimide? Polyimide is tough! Have you tried 2nd
drilling before etch? (If you try this, get out the white gloves
and make sure the panels don't get scratched from handling or pins
on the drill machine.) Also, my 2 nd drill parameters are pretty
hot and fast. Maybe wind it up a little.
Groovy
______________________________ Reply Separator _________________________________
Subject: FAB:haloing
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 6/6/96 11:28 AM
We are 2nd stage drilling .220" to .250" holes at NC rout and experiencing
.020" to .030" haloing/delamination. The 2nd drill is in areas of bare
laminate (no metal pad or ground plane). Does anyone have suggestions to
prevent this? Thanks for any input.
Lyle Anderson
Electrostar-Utah
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