So it has been done.  Cool!  Now to "design it in" on our product.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Genny Gibbard
Sent: Friday, October 01, 2004 10:51 AM
To: [log in to unmask]
Subject: Re: [TN] stacking PC boards and reflowing together


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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------