Jack, In a prior life, I used solder preforms shaped like donuts to accomplish the same thing that you're trying to do. There are several solder preform manufacturers out there. They come in all shapes and sizes. The process is feasible. The biggest problem that I had was assuring that the donuts stayed where I placed them prior to soldering. Also, depending upon their size, they can be very fragile. if you have good process control in the soldering process, you can make it work. Hope this helps. Good Luck. Lee Whiteman Senior Manufacturing Engineer E-Mail: [log in to unmask] <mailto:[log in to unmask]> Ph: (610) 362-1200 x208 Fax: (610) 362-1290 > -----Original Message----- > From: TechNet [mailto:[log in to unmask]]On Behalf Of Jack C. Olson > Sent: Wednesday, May 22, 2002 11:59 AM > To: [log in to unmask] > Subject: [TN] ASSY: Reflow for Through-Hole Devices > > > One of my colleagues here is thinking their must be some kind of solder > ring, or collar, or donut shaped thing that you can drop over the leads of > a (bottom mounted) through-hole device, and then when you reflow the board > the donuts melt and form a fillet for the PTH device at the same time. > > Does anyone do this? > If this is feasible, where can I find out more (and get a source for the > solder rings)? > > Jack > > ------------------------------------------------------------------ > --------------- > Technet 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 Technet > To temporarily halt delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL > 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/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ------------------------------------------------------------------ > --------------- > --------------------------------------------------------------------------------- Technet 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 Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------