Robert, What are the issues with the assembly process? ______________________________ Reply Separator _________________________________ Subject: Problems with Via in Pads Author: [log in to unmask] at corp Date: 5/15/97 10:00 AM Hi TechNetters, We are experiencing assembly problems with 13.5 mil drilled vias in pad from one of our board suppliers. After looking at cross sections from a sample during the problem period, I suspect that the root cause of the problem is irregular hole walls due to drilling. My questions are regarding the drill operation. How many boards are acceptable in a stack up at drill assuming .062" multilayer and .0135" drills? With the proper stack up, how many hits are acceptable for a new and/or a resharpened drill? How many times can a .0135" drill be reliably resharpened? Any other thoughts as to the cause of rough hole walls on via holes would be appreciated. Thanks, Robert Furrow at Lucent Technologies, North Andover, Ma. *************************************************************************** * 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] * ***************************************************************************