Conductive inks? I remember using them to make ceramic monolithic capacitors.. The required baking to cure them and they contained exotic metals like palladium etc... Never would have thought of that... I wonder it they would stand up in an application like that? Interesting thought, thanks... The eyelet is probably the most obvious idea, however we are mounting a tuned filter over the hole and it might cause a mechanical interference between the coil form and the eyelet flange. Another thought was copper tape or strips... but they seem very labor intensive. Selective electroless plating would be the ideal option but I don't think anyone has invented it yet... or sputtering but I think the masking job would be intense... Maybe a milled out plug that just fit inside the hole and then solder it in? Probably impractical. Thanks for the ideas... It looks like we may not have to do it after all so the pressure is off, but it is potentially an activity someone might need to do someday... Best regards, Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Lee Parker [mailto:[log in to unmask]] Sent: Wednesday, December 01, 2004 9:13 AM To: [log in to unmask] Subject: Re: [TN] Plating through a 2 layer board hole after assembly? Bill You might want to look into conductive inks. It would probably require some process development. Some curing would also be involved. Several suppliers have these products on the market. Best regards Lee -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Brooks,Bill Sent: Tuesday, November 30, 2004 7:08 PM To: [log in to unmask] Subject: [TN] Plating through a 2 layer board hole after assembly? Don't laugh... I have been asked to find out if we can plate thru a 2 layer board hole top to bottom after the board has been assembled... Is this possible? If so how? And who would do it? Other alternatives to get connectivity from the top to the bottom side of an already assembled board? Z-wires? Eyelets? Any other ideas? The non-plated hole is .156 diameter and the thickness of the board is 063 FR4 glass/epoxy material 2oz copper both sides. Thanks in advance.. Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: R Sedlak [mailto:[log in to unmask]] Sent: Tuesday, November 30, 2004 3:31 PM To: [log in to unmask] Subject: Re: [TN] Immersion White Tin Plating Specification Before we go off writing specifcations that make the fabrications people spit and swear, I want to remind all that all immersion plating is self-limiting, and when all the substrate is covered, you stop plating, no matter what temperature, or how long you leave it in the plating bath... Most fabricators have trouble getting 50 microinches of Tin, and 40 is pretty much the standard... 30 is pretty considered pretty thin.. And, no flat finishes are going to perform as well as HASL, if only because of thickness, nevermind superiority of alloy... Rudy Sedlak RD Chemical Company --------------------------------- Do you Yahoo!? --------------------------------------------------- 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 ----------------------------------------------------- All your favorites on one personal page - Try My Yahoo! --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------