At 02:04 PM 11/13/01 -0600, Mark E Witherite wrote: > I've been monitoring this thread and would like to know isn't any one > worried about delamination of the PCB? I've had at lease 3 board houses > flag me about extending the copper all the way to the board edge.
I suppose the board material-copper bond might not be as strong as the board material bonded to itself. Since I have never made a board with copper to the very edge (I have done extra plating on an internal slot) I don't have any experience with such a board delaminating. Essentially, the idea would be that a crack could get started at the edge, particularly if the whole edge were weak. However, the process as I suggested it would leave a few areas of no-copper at the edges where the tabs were. One likely place for some of these tabs would be the corner of the board. So there would be no place for the crack to start. IPC-2222 explicitly allows "ground and heat sink planes to extend to the edge when required by design." (p.20) [EMAIL PROTECTED] Abdulrahman Lomax Easthampton, Massachusetts USA * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
