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April 1998

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 31 Mar 1998 18:56:04 -0600
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Dwight, Steven,
I would like to point out that TR-NWT-000078 has been surplanted by
GR-78, Issue 1, Septmber 1997.

Bev Christian
Nortel

>----------
>From:  Dwight Mattix[SMTP:[log in to unmask]]
>Sent:  Tuesday, March 31, 1998 12:26 PM
>To:    [log in to unmask]
>Subject:       Re: [TN] press-fit connectors
>
>The bible for pressfit is Bellcore TR-NWT-000078 (esp. chapters 4, 6, 7).
>
>(my $.02)
>- Spec and verify the plated thru hole carefully, using the connector
>manufacturer's hole specification (e.g. a common .040 finished hole spec is
>drill .0453 +/- .001, min copper .0012, finished hole .040" +/- .002 or
>.003, hole to hole true position tolerance w/in connector pattern .0001").
>Get the connector supplier spec!
>- Qual per Bellcore insertion/retention forces and microsection analysis of
>hole wall deformation
>- Monitor qual periodically in production (Bellcore forces and microsection)
>- Monitor/Control insertion forces and Z-stops in process
>
><fwiw> We've had good success w/ pressfit generally but there are plenty of
>ways to mess it up and get in trouble (i've got the scar tissue to prove it
>:-) ).  Personal bias based on our experience and studies done by Litton is
>the compliant C section Litton/Winchester developed.  It's used widely by
>other manufacturers now.  Engineering crew at Litton Interpak understands
>the basic science and how to do it right as well as anyone I know.
>([log in to unmask])
>
>Dwight Mattix
>Staff QE, Mgr
>
>At 11:23 AM 3/30/98 -0500, you wrote:
>>I am looking for information on press-fit (rather than soldering)
>>connectors.  In particular, we are looking to use these on backplanes
>>for military jobs.  Does anyone have any experience with such
>>connectors?  Where can I find out further information on them?  What
>>kind of tools do I need for my process?
>>
>>Thanks in advance.
>>
>>Steven Lustig
>>Process Engineer
>>EMS Technologies, Inc.
>>Norcross, GA
>>(770) 263-9200 x4714
>>[log in to unmask]
>>
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