Appears to be weak glass etch - the glass is cut evenly but protrudes
into the plated barrel. Also the palting appears to be thinner that
required.
Jeffrey Bush
Director, Quality Assurance and Technical Support
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302-1890
Tel. 802.257.4571.21 Fax. 802.257.0011
[log in to unmask]
http://www.vtcircuits.com
-----Original Message-----
From: Dam, Phil [mailto:[log in to unmask]]
Sent: Tuesday, March 30, 2004 7:37 AM
To: [log in to unmask]
Subject: Re: [TN] Hole wall quality
I'm assuming the board is a multilayer, not having looked at the images.
Make sure the multilayer lamination pressures,cure time, and temperature
are correct to effect good drilling performance.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Franklin D Asbell
Sent: Monday, March 29, 2004 5:46 PM
To: [log in to unmask]
Subject: [TN] Hole wall quality
I've been asked to evaluate some images, hole wall plating defects, and
try to locate the cause.
The information available to me are these are drilled 0.021" holes, they
were drilled one panel up, four panels total, and there was only one
0.021" tool per spindle. The spindles were new or repoints. Upon
evaluating the bits nothing really jumped out as bad...another image not
posted shows excessive nailheading.
I'm open to any and all comments...as well as a list of items I can
begin checking...thanks
I've posted the images at http://asbell.net/images.htm
Franklin
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