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August 2004

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Subject:
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ingemar Hernefjord (KC/EMW)
Date:
Wed, 18 Aug 2004 18:19:24 +0200
Content-Type:
text/plain
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text/plain (294 lines)
Of course, redunancy is a good thing. I've contacted Steve on another adress, but SMT is also OK, I'll send offline to Daan.
Ingemar


-----Original Message-----
From: Fineline Circuits, Inc. [mailto:[log in to unmask]]
Sent: den 18 augusti 2004 17:43
To: TechNet E-Mail Forum; Ingemar Hernefjord (KC/EMW); Daan Terstegge
Subject: Re: [TN] Most common PCB failure modes


Ingemar:
May be Daan can put it on his website www.smtinfo.net. Looks like steve in
not online. I would like a copy too.

Sona Sitapara
Fineline Circuits Inc.
[log in to unmask]


----- Original Message -----
From: "Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 18, 2004 8:14 AM
Subject: Re: [TN] Most common PCB failure modes


> 1st:May I point out that the fishbone diagram is not my creation.
> 2nd: As so many want it (surprise! Do professionals like you need such
crib?), maybe Steve can put a copy on his homestead. Watt do u zink, Steve?
>
> Ingemar
>
> PS. fishbones are excellent for teaching the mysteries of SMT, you get a
knowledge platform, but they don't automatically guide you to the root of a
specific Murphy day problem.
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Marvin Gaines
> Sent: den 18 augusti 2004 13:49
> To: [log in to unmask]
> Subject: Re: [TN] Most common PCB failure modes
>
>
> Kristopher,
>
> My experience in this matter is that PCB manufacturing companies
> have not had one common defect that can be detailed as a persistent
problem
> unless they
> have a process issue and then the defect should be able to be traced to a
> date code).
> Usually there is a myriad of issue's that the public never knows about.
> As with all manufacturing there are issue's that come up and make it
> ultimately to the end customer.
> So to pinpoint one common problem would be difficult.
>
>
> Ted Gaines
> Ht&D Cam Service
> 775-599-6720
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Graham Naisbitt
> Sent: Wednesday, August 18, 2004 7:11 AM
> To: [log in to unmask]
> Subject: Re: [TN] Most common PCB failure modes
>
>
> Hi Kristopher
>
> All our customers tell us they have zero defects and no failures.
>
> We call this "Telling Porky Pies".
>
> I did a net search on your question and came up with one that might be
> useful: http://www.allaboutcircuits.com/vol_5/chpt_8/5.html
>
> --
> Regards Graham Naisbitt
>
> [log in to unmask]
>
> Concoat Limited - Engineering Reliability in Electronics
> A British Manufacturer
>
> www.conformalcoating.com      www.concoat.co.uk     www.concoatsystems.com
>
> Golf Quote of the week: If you think its hard to meet new people, try
> picking up the wrong golf ball.
>
> Cell: 079 6858 2121
> Office: +44 (0)1252 813706
>
>
>
> > Hello,
> > Could some of you share what are the most common PCB defects that escape
> to
> > your customers?
> >
> >
> > Thanks
> >
> > Kristopher J. Keating
> > Circuit-Wise, Inc.
> > 400 Sackett Point Rd.
> > North Haven, CT 06473
> > tel. (203) 281-6511 x 410
> > fax (203) 287-8409
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord
> > (KC/EMW)
> > Sent: Tuesday, August 17, 2004 3:16 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] thin film
> >
> > Seal Science say they have it all:
> > http://www.sealscience.com/html/products/VacuumCupsPdfs/15about.pdf
> > ultrahighvacuum guys use pure gold gaskets:
> > http://www.sisweb.com/catalog/F39.pdf
> > ourselves, we use as simple as butyl rubber:
> > http://www.allstategasket.com/materials.asp (not Ultravacuum, of course)
> > Butyl rubber group includes ordinary rubber used in your mountainbike
> tire,
> > can keep vacuum or pressure for very long time.
> > /Ingemar
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Crepeau, Phil
> > Sent: den 17 augusti 2004 02:25
> > To: [log in to unmask]
> > Subject: Re: [TN] thin film
> >
> >
> > hi,
> >
> > i believe you should be able to use a gasket material such as viton.
> >
> > phil
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Douglas O. Pauls
> > Sent: Monday, August 16, 2004 2:02 PM
> > To: [log in to unmask]
> > Subject: [TN] thin film
> >
> >
> > Good day all,
> > I am in need of a recommendation for a thin film sealant material.  I
need
> > it to be 15-20 mils thick, cuttable, and preferrably non silicone.  We
> have
> > considered the Sil-Pad technology, but as this will be used in a vacuum
> seal
> > operation, I am concerned about silicone outgassing or cross
> contamination.
> > Are there any thin gasket materials from the engineered rubbers that
> anyone
> > would recommend?
> >
> > Doug Pauls
> >
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