Vias in the formal sense of the word -- not just thru-holes... -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix Sent: Thursday, April 26, 2007 5:24 PM To: [log in to unmask] Subject: Re: [TN] "plated shut vias" 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------