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Subject:	Re: IPC-DR-572
From:	Victor Hernandez <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 7 Jan 2004 16:01:13 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (53 lines)

Franklin,

   Thanks for the feedback on my inquiry and the clarification.   Therefore,
a 2 sided
Printed Circuit Board / Printed Wire Board with not copper plated thru holes
has a
non-supported annular external rings.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin D Asbell
Sent: Wednesday, January 07, 2004 3:58 PM
To: [log in to unmask]
Subject: Re: [TN] IPC-DR-572


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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