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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:
Thu, 19 Aug 2004 09:03:54 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (277 lines)
With all respect, the devotion of TNs is heartbreaking, but can't
send offline to all, plz go to: http://www.residues.com/
and have a fishbone copy there. Sara Gorcos was so sweet and pulled me up
before I drowned..tx my friend.

If I had an idea about the appetite, I'd reorganized the bone before presentation, in my opinion it's not quite streamlined...e.g. the 'adhesive' branch in the diagram, only two parameters. I would like to add some more, for instance: curing, wetting, compatibility with FR4, crimping tensions, hardness, solubility, solvent residues, joint geometri, time to maximum adhesion, UV absorbation, heat resistance, use of primer, water absorption factor and on and on.....a whole diagram on it's own (I would ask Graham to make it complete)..so, perhaps one could use the wishbone diagram as a starter, and then go to the main meals and finish with a nice dessert. If I get time, I'll make a try..

Enough about this topic.

Ingemar Hernefjord
Ericsson Microwave Systems

PS. The administrator's eye may have seen the little play with consonants, 'f' is changed to 'w' in fishbone. I'll be punished for 'wittying', but it was worth the risk!


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Karen Walters
Sent: den 18 augusti 2004 20:16
To: [log in to unmask]
Subject: Re: [TN] Most common PCB failure modes


Please send me a copy also off line.  It would be appreciated.
(Embedded image moved to file: pic00041.pcx)



                      Bill Coleman
                      <BColeman@PHOTOST        To:       [log in to unmask]
                      ENCIL.COM>               cc:
                      Sent by: TechNet         Subject:  Re: [TN] Most common PCB failure modes
                      <[log in to unmask]>


                      08/18/2004 11:14
                      AM
                      Please respond to
                      TechNet E-Mail
                      Forum; Please
                      respond to Bill
                      Coleman






Hi Ingemar

Ditto on the fish-bone diagram; appreciate if you could email me a copy.

Thanks much.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Kevin Jaworenko
Sent: Wednesday, August 18, 2004 8:45 AM
To: [log in to unmask]
Subject: Re: [TN] Most common PCB failure modes


I'd love to have a copy of the now fmaous fish-bone diagram as well.

Thanks Ingemar.

-----Original Message-----
From: Ingemar Hernefjord (KC/EMW) [mailto:[log in to unmask]]
Sent: August 18, 2004 1:35 AM
To: [log in to unmask]
Subject: Re: [TN] Most common PCB failure modes


Got a very useful fishbone diagram including all common problems (or rather
problem groups) in SMT. Place a copy on your desktop.
Can send you a copy offline if you want.
/Ingemar



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Kristopher J. Keating
Sent: den 17 augusti 2004 20:17
To: [log in to unmask]
Subject: [TN] Most common PCB failure modes


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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