Hi Ken: Have encounter similar situations of delamination only on terminals whose barrels are much larger than the average TH. Same thing boards that have been process for several years all of a sudden delaminate. It either has to do with the manufacturer using the bits too long ( it does not happen to every terminal, it saves time ) or they are using cheaper material to get back the profit lost due to inflation. If the bits are used too long and loose its sharpness, instead of cutting, it explodes out of the last layer. Similar to what happens when drilling plywood. FR4 Material is different and bit may not burst out, but it may stress the last layer bond. Heat will cause it to separate. As long as the delamination does not violate minimum electrical spacing, it is not a defect. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Bloomquist, Ken Sent: Thursday, June 16, 2005 3:17 PM To: [log in to unmask] Subject: Re: [TN] Measling Conundrum Hi Steve and Ramon, I'll answer Ramon's question first; "Is this the first time that you run this board through the wave?" No, we've run them before and had much better results. We will give baking them a try. Steve, they are not pressed in hard at all. They are in hard enough to keep the perpendicular through the wave process but you can still turn them with your fingers after they are swaged. The holes are actually quite large, .191". KennyB --------------------------------------------------- Technet Mail List provided as a 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/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 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------