Tested. High levels of >500 Hz and up to 100 g's breaks the self resonating legs Inge -------------------------------------------------- From: "Thayer, Wayne - IIW" <[log in to unmask]> Sent: den 12 March 2010 11:18 To: <[log in to unmask]> Subject: Re: [TN] Vibration issue > Put a dot of staking adhesive down before you put the part down. > > Wayne > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge > Sent: Friday, March 12, 2010 1:48 PM > To: [log in to unmask] > Subject: [TN] Vibration issue > > Hi all, > we are making a very vital part for a aircraft builder. Problem with > TQFPs, some 200 legs. There are resonance peaks that kill the package > legs. > Redesign is not to think of from the customer, so we must do something on > inside of the box. One solution (not popular) is to use a string of a > glue > along the leg rows in order to lock them. Another is to place a vibration > dampening mat on one side of the board. That one is more tricky , but > there > is a US company with lots of stuff for that purpose. Anyone with > experience from this area? I should add that not all legs are broken, just > one or two after 100 hs of random vibration, but that is of course not > acceptable. BGAs would solve the problem, but there is no time for > redesign. > I'm sorry for coming with a serious message at this holy time of the > week. > Thanks > /Inge > > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > --------------------------------------------------- > 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 > ----------------------------------------------------- > > This e-mail and any files transmitted with it may be proprietary and are > intended solely for the use of the individual or entity to whom they are > addressed. 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For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- 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 -----------------------------------------------------