At 12:23 PM 4/26/2007, Werner Engelmaier wrote:
>Hi All,
>Vias should never be specified in terms of finished hole size (there is no
>functional need for any specific finished hole diameter),


And yes I agree wholeheartedly that the drilled diameter is the most 
critical dimension -- especially in the case of pressfit connectors where a 
gas tight joint w/out over stressing the barrel/post is the goal.


However, in the case of pressfit connectors, I beg to differ about finished 
hole diameter not being needed .  Min hole size is very important in this 
case.  It determines the point at which insert forces get too high and bad 
things start to happen (e.g. "Z-ing" in pins to board surface).

dw

>  but in terms of
>drilled hile diameter, because that determines all kinds of things 
>important to
>the reliability of the via interconnect structure.
>
>Werner
>
>
>
>**************************************
>  See what's free at http://www.aol.com.
>
>---------------------------------------------------
>Technet Mail List provided as a service by IPC using LISTSERV 15.0
>To unsubscribe, send a message to [log in to unmask] with following text in
>the BODY (NOT the subject field): SIGNOFF Technet
>To temporarily halt or (re-start) delivery of Technet send e-mail to 
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to 
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at: http://listserv.ipc.org/archives
>Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
>for additional information, or contact Keach Sasamori at [log in to unmask] or 
>847-615-7100 ext.2815
>-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------