What about the nailheading?
I realize that if the nailheading isn't excessive it isn't necessarily a
defect in and of itself. However, isn't the nailheading at least a process
indicator of (overly) aggressive drill parameters?
Couldn't (wouldn't) the same drill parameters that result in nailheading
complicate the desmear (result in a need for overly aggressive desmear
suggested below)?
Just thinking out loud (clearly outside my area of expertise).
Hey if I was any good as an engineer what would I be doing in Quality? ;^)
best of luck sleuthing this out and Friday cheers to all,
Dwight Mattix
Sr Staff Quality Engineer
Corporate Engineering, Qualcomm, Inc
At 02:03 PM 3/31/2004 -0500, Reeves, Tim R. wrote:
>Everyone is saying inadequate glass etch but few fabricators these days are
>really using a glass etch. Drilling doesn't look good, but I'd say it's
>over-aggressive desmear. That's why so much glass fiber protrusion.
>Franklin, what was desmear condition? Alkaline permanganate? How long, what
>temp.? One-pass or two? Is it ordinary FR-4, high Tg, or more high
>performance material?
> The plating definitely looks thin, based on comparison with inner foil,
>whether it's 1 oz. or 1/2 oz.
>
>Tim Reeves
>Tyco Printed Circuit Group - Dallas Division
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Werner Engelmaier
>Sent: Tuesday, March 30, 2004 9:08 AM
>Subject: Re: Hole wall quality
>
>
>Hi Franklin,
>Whether or not these PWBs will give trouble in service depends on the
>product
>appllication--o.k. for benign environments, likely to fail in servere
>environments. The certainly are not the prettiest x-sections I have
>seen--inadequate
>glass etch, some glass-fiber rip-out, l plating rather thin---all resulting
>in
>stress risers in thin plating that is thinner still localized.
>
>Regards,
>Werner Engelmaier
>Engelmaier Associates, L.C.
>Electronic Packaging, Interconnection and Reliability Consulting
>7 Jasmine Run
>Ormond Beach, FL 32174 USA
>Phone: 386-437-8747, Fax: 386-437-8737
>E-mail: [log in to unmask], Website: www.engelmaier.com
>
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