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| Reply To: | TechNet E-Mail Forum. |
| Date: | Tue, 14 Jan 2003 10:50:04 -0500 |
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The board designer has no idea which process the PCB will be run i.e.
water soluble vs noclean. The stencils for a water-soluble paste would less
likely include home plate and other aperture modifications. Therefore it is
my opinion that it must ultimately be the Mfg, Engineer 's job designing
the actual stencil.
Marcus Wheeler
Sr. Mfg. Engineer
Apsco International
[log in to unmask]
440-352-8961 * 530
"Cyker, Howard A
(Howie)" To: [log in to unmask]
<[log in to unmask] cc:
> Subject: Re: [TN] Stencils
Sent by: TechNet
<[log in to unmask]>
01/14/2003 10:16
AM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to
"Cyker, Howard A
(Howie)"
I agree with Mr. Croslin with supplying a 1:1 stencil layer artwork to the
EMS provider so they can tailor the stencil design to their materials and
assembly processes. One other consideration during stencil design is
attachment reliability requirements. If the board designer has specific
solder volume requirements (beyond industry (IPC) solder joint quality
standards) to meet product reliability requirements, then these
requirements must be communicated to the EMS provider for consideration
when they design the stencil.
Howard A. Cyker
Lucent Technologies
Engineering Infrastructure - New Product Engineering
Email [log in to unmask]
Phone 978-960-2964
Fax 978-960-2964
Pager 888-961-2336
-----Original Message-----
From: Croslin, Robert [mailto:[log in to unmask]]
Sent: Tuesday, January 14, 2003 9:58 AM
To: [log in to unmask]
Subject: Re: [TN] Stencils
From a design standpoint, we provide our CEM houses with a one-to-one
stencil layer embedded in our Gerber files. This allows them to adjust it
appropriately based on their equipment, processes, stencil manfacturer,
etc.
Bob Croslin
Nielsen Media Research
-----Original Message-----
From: Donald Kyle [mailto:[log in to unmask]]
Sent: Tuesday, January 14, 2003 9:33 AM
To: [log in to unmask]
Subject: [TN] Stencils
I would like your opinion on who would be more suited to
design stencils for SMT PWBs; the board designer or the
contract-manufacturing engineer.
What do you do and why?
Donald Kyle C.I.D.+
281-285-7528 ---------------------------------------------------
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