I would think that most of the solder should wick out to form the meniscus around the termination and leave the lead sitting pretty much on the pad. This might be pretty off-base, so I would welcome rebuttals. This brings up another English problem that came up recently here. My manager got all confused about leaded lead-free parts. You know, the through-hole (leaded) parts soldered by a lead-free wave. He had everybody in the lead-free team buzzing around here like a bunch of bees before we got it explained to him :) -- George Patrick Tektronix, Inc. Central Engineering, PCB Design Group P.O. Box 500, M/S 39-512 Beaverton, OR 97077-0001 Phone: 503-627-5272 Fax: 503-627-5587 http://www.tektronix.com http://www.pcb-designer.com It's my opinion, not Tektronix' -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack C. Olson Sent: Friday, March 18, 2005 09:09 To: [log in to unmask] Subject: [DC] Floating SMT components? I have been asked a question that I've never read anything about before, so I'm hoping someone will know this... We have a mechanical engineer who is trying to predict the distance between boards after soldering SMT board-to-board connectors. We know the connector mating height, but the question is: "If the connector is sitting in solder-paste, how high will it stay above the surface of the board?" Common sense tells me the connector will not be flush to the surface, there will be some solder under there, and I think we are using 6mil paste screens. Has anyone had to document something like this before? Jack ---------------------------------------------------------------------------- ----- 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 temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) 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 847-615-7100 ext.2815 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- 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 temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) 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 847-615-7100 ext.2815 ---------------------------------------------------------------------------------