Stacking at drilling is common. Hole quality, registration and ability to maintain hole exit location are key. What to stack depends upon your internal spacing and the quality and capability of you drill tools. 2-3 high should work on product with wide spacing between hole and feature. Jim Herard IBM Microelectronics Endicott Quality Engineering ---------------------- Forwarded by Jim Herard/Endicott/IBM on 05-30-97 10:23 AM --------------------------- Robisan1 @ aol.com 05-29-97 08:27 PM Please respond to [log in to unmask] @ internet To: technet @ ipc.org @ internet cc: Subject: fab: drilling One of my customers has a question regarding stack height for multilayer printed boards for drilling. When I was building boards, I drilled only one at a time. However, we were not producing high volumes of boards and all I can think of is why I wouldn't want to do it. Do any of you have experience drilling more than one panel of multilayers at a time? What are your criteria for determining when to stack and how many? Thanks, Susan Mansilla Robisan Lab *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************