Dear Frank, I have checked with our CAM engineering manager and he is not aware of any spec regarding proximity of an NPT to the edge. We have made boards where the tooling hole intentionally breaks out from the edge with no ill effects. Charlie Cobb Regional Manager Dynamic & Proto Circuits Inc. Cell - 860-830-9586 Fax - 416-352-0125 http://www.dapc.com --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 847-509-9700 ext.5315 ---------------------------------------------------------------------------------