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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 11 May 2000 13:45:47 -0400 |
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Sorry for the confusion. I just discovered that this problem was corrected
in IPC-2221 Amendment 1
Bill
> -----Original Message-----
> From: Dieffenbacher, William C
> Sent: Thursday, May 11, 2000 9:35 PM
> To: [log in to unmask]
> Subject: Plated Hole Pad Dimensions
>
> Can someone please explain why the internal pad size is calculated (per
> IPC-D-275 and IPC-2221) based upon the maximum diameter of the plated hole
> instead of the drilled hole diameter? Many suppliers drill the holes a
> little larger than the maximum diameter of the finished hole. It seems
> like the pad size should be based upon the drilled hole since the annular
> ring is measured at the foil. The fabrication allowances don't seem to be
> quite enough to accommodate this. I'm sure this has been discussed
> before, I just need a refresher.
>
> Bill Dieffenbacher
> Lockheed Martin
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