Jack: I have never measured the space between the bottom of a component's leads and the top of a pad, my guesstimate would be that it is less than a mill to 2 mills, depending on the weight of the component. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Jack C. Olson Sent: Friday, March 18, 2005 12:07 PM To: [log in to unmask] Subject: [TN] Floating SMT components? I have been asked a question that I've never read anything about before, so I'm hoping some of you assembly gurus out there 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 --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------