We tried this with a piece of Rogers4003 on top of FR4. The surfaces being soldered together were almost solid ground plane, so we had a checkerboard pattern of soldermask/solderpaste, in order to help it line up when the solder reflowed. I think the assemblers also put a piece of buss wire through two lined up vias on each board, before running it through the oven, to keep the boards from sliding around. I think it worked OK, but it was several years ago and the product never took off so it wasn't a high volume run. -----Original Message----- From: Phil Nutting [mailto:[log in to unmask]] Sent: October 1, 2004 7:24 AM To: [log in to unmask] Subject: [TN] stacking PC boards and reflowing together Good morning, Has anyone tried reflow soldering one circuit board on top of another as if the top board were just another SMT part? We have a design where we currently design this as thru-hole boards and attempt to solder them together... sometimes three boards high, which never works to my satisfaction. Phil Nutting Manufacturing Engineer Kaiser Systems, Inc. 126 Sohier Road Beverly, MA 01915 voice 978-922-9300, ext. 2315 fax 978-977-3018 e-mail [log in to unmask] www.kaisersystems.com --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 -----------------------------------------------------