Good Day to all,

        My PCB fab house has been trying to correct an issue regarding the
finished size of a PTH.  In our discussions, they mentioned an item I don't
quite understand and thought I would utilize the vast knowledge of forum to
get an Educated opinion... (I understand the risks involved with that
method)

We are using HASL finished boards, 8 layers, .125" thick.  Nothing too wild
there.

        The fab house stated they could better control the tolerance (+.003
/ -0) on a PTH if the annular ring were larger.  The current ring is about
.012" larger than the radius of the hole (.213).  They wish to increase the
ring by .010" to.015" as a means of controlling the amount of plating
applied to the inside of the PTH.

        Is this possible??  Does the annular ring have that much control on
the amount of plating applied to the barrel of the PTH?  Are they blowing
smoke to cover a process related issue?

Thank you for your interest.

Rich


Richard Elensky
Sr. Manufacturing Engineer
[log in to unmask] <mailto:[log in to unmask]>

Tel:  559-292-1111  x246
Fax:  559-292-9355

Dantel
2991 North Argyle Ave.
Fresno, CA, 93727
Visit our web site at:
http:// www.dantel.com <http://www.dantel.com>

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