Chris - First step - has anyone looked at a cross section of the board to determine whether or not the dimensional spacing of the layers is as desired? If they are not, then clarification of the design and a bit of work with the fab house may solve the problem. If you need step 2, shoot me an Email with your findings and we'll have a go at it. Regards - Kelly -----Original Message----- From: Chris Bartkowiak <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Monday, September 27, 1999 1:29 PM Subject: [TN] Warped PCB's >Friends: > >I have a 6 layer board that warps. The R&D group tells me its a >Manufacturing problem. I'm not so sure. > >Details: >.062" Thick NEMA FR4 >Stack: (Trace/Gnd/Trace/Trace/Power/Trace) w/1/2 oz copper clad. >R&D group tells me the layers are balanced from the center of the stack >out. > >What should Manufacturing be doing to prevent these boards from >warping? Or is the only solution a higher temperature >FR4 material that adds cost to the board. Could it be a problem with >the board house. Please advise. > >Regards, Chris > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in >the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional >information. >If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or >847-509-9700 ext.5365 >############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################