"Drawbridging" is a new(ish) term to me, and I reasoned that if 'Tombstoning' means a component standing on end (or tending in that direction) and 'Billboarding' means components standing on their side, 'Drawbridging', if different from the other two, would nicely describe a phenomenon I experienced a couple of times. Depends on your design of drawbridge, however. In my mind, I had a picture of two halves of a bridge rising from the middle, pivoting at either end. The phenomenon I experienced was when a couple of chip resistors sustained damage in a strange way - the end caps and their solder joints were present on the board, but the main body of the thing had disappeared. My initial thoughts were impact damage, but then one affected component was right in the midst of a veritable metropolis of discrete components, while the other was in a completely different area of the board. I noticed that the solder volume in the joints for these was somewhat on the high side, and concluded that while cooling, the contraction had been enough to pull the end caps away from the component body enough for the body itself to fall out - i.e. it seemed that both ends had tried to tombstone at the same time, resulting in a failure in the middle. If anyone can refute this deduction, I would be only to pleased to hear. Peter Werner Engelmaier <[log in to unmask]> 10/01/2003 12:40 AM Sent by: TechNet <[log in to unmask]> Please respond to "TechNet E-Mail Forum."; Please respond to Engelmaier To: [log in to unmask] cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group) Subject: Re: [TN] Help anyone!!! Hi Steve, In a message dated 01/08/2003 22:33:54, [log in to unmask] writes: >First off, are these really "tombstones" or are they "drawbridges"? I It has been my understanding for some 20 years that "tombstones" and "drawbridges" are just different words for the same problem--has soomethinng changed? Regards, Werner Engelmaier --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------