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October 1997

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Date:
Fri, 24 Oct 1997 12:08:02 -0400
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In a message dated 97-10-24 01:57:45 EDT, you write:

<< My board has the plated finish hole size of 13 mil +0, -8 mil on 93 mil
 thick fab and I have the following question in that regards.

 (1) Any worry from aspect ratio point of view? or it's a piece of cake for
 reliable fab house?
 (2) Is current technology is capable of handling this?
 (3) What sorts of question should we ask to make sure fab house can do it
 meaning from equipment point of view?
  >>
Ken
Why the tolerance of +0, -8 instead of +0, -13.  It should be ok to plate or
solder coat the hole shut.  It is not a piece of cake but is doable by a
reliable fab house.  Find out their aspect ratio for drill capabilities,
desmear or etchback process, and electroplated copper elongation %.  Find out
if they are using air bearing spindles at drilling if they have vibration on
their electroless line.
Scott

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