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January 2004

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Subject:
Re: IPC-DR-572
From:
Franklin D Asbell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 7 Jan 2004 15:58:24 -0600
Content-Type:
text/plain
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text/plain (23 lines) 
Not sure if there is such a table as drill sizes and annular ring may vary
from design to design.

Example, you may have a 40 mil pad and need a 20 mil (finished) drill, this
will leave a total of 10 mil annular ring, now another application may need
a 30 mil (finished) drill, this will leave a 5 mil annular ring...it's all
in the design...

And yes, supported refers to hole wall plating, non-supported means no hole
wall plating.

Franklin

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