Our company has been successfully using CPCI style connectors in a .250 
inch backplane
that actually insert from opposite sides of the board and share the same 
hole.
The pin length is approx. 070 inch.

The main issue is correct hole design for the press-fit pin one is using.
And as mentioned below, finding any pins that buckle during the inserting.

In circuit testing on 100% of the pins is required.

Hope this helps.

Dave



Wayne Thayer wrote:

>Only thing I see is that without full protrusion they are difficult to inspect for buckling.  Buckling is the nemesis of press-fits.  You can still inspect by looking carefully down all of the holes--0.088 doesn't sound like a very thick board, so the tips should be readily visible.  In that case, the inspection concern would be minimal.
>
>Wayne Thayer
>
>  
>
>>>>[log in to unmask] 2/21/2007 11:33 am >>>
>>>>        
>>>>
>Not sure what the question is, but if the connector is press-fit, what is
>the concern of zero or negative lead protrusion?  On the dynamic pin makes
>contact with the PTH, it is contacting all layers connected to the PTH.  So
>unless you need to solder to the tails, what's the worry?
> 
>
>-----Original Message-----
>From: Bremer, Gary [mailto:[log in to unmask]] 
>Sent: Wednesday, February 21, 2007 10:52 AM
>To: [log in to unmask] 
>Subject: [TN] Lead Protrusion
>
>Hello
>
> 
>
>We build class 3 products and engineering has allowed the tolerances to give
>me zero lead protrusion on press fit connectors and they are just now
>concerened that there might be a problem. Our board contains 10 layer and
>thickness is .088 the copper is 2 oz on all layers and for the connector the
>contacts ar .104±.010.
>
> 
>
>Steve would you post the attached pictures so other can view.
>
> 
>
>Gary Bremer
>Senior Manufacturing Engineer, CIT, CID
>  
>Curtiss-Wright Controls Inc. 
>Embedded Computing -Subsystem
>
>28965 Avenue Penn
>Santa Clarita, CA 91355-4185
>Main: 661.257.4430 extension 2170
>Fax: 661.257.4782
>
>
>e-mail: [log in to unmask] 
>Web: www.cwcembedded.com 
>
>
>  
>

-- 
Dave Seymour, CID+
Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560

Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297

[log in to unmask]




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