Gaby, thanks. That's a condition we hadn't taken into consideration before, but certainly will in the future. Bob -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Gabriela Sent: Thursday, May 29, 2008 12:37 AM To: [log in to unmask] Subject: Re: [TN] PTH's With Immersion Silver Robert, I had a similar problem when we switched circuit manufacturers. The drawing of the circuit had a specific final diameter requirement for the connector holes and the plating was at first HASL. As you know, due to the thickness of the HASL coating, the drilling diameter is a bit larger in order to allow the final dimensions to match the requirement. So, at first, we received circuits with holes within tolerances coated with a thick soft coating. This allowed the easy connector insertion with eventual deformation of the coating. When we switched to another manufacturer with immersion silver , the drilling diameter of his holes was smaller, because he had to perform a thin finish, practically with no thickness addition to the copper. The final diameter was the same, but insertion was difficult- the HASL coating is somehow like a lubricant, immersion silver is not. Gaby -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert Sent: Tuesday, May 27, 2008 9:57 PM To: [log in to unmask] Subject: Re: [TN] PTH's With Immersion Silver Lee and all, thanks very much. I've just sent a summary of the responses to our CM and have asked for cross sectioning to be done. Regardless of the "why" there's a very nice, but frustrated operator named Carla on the production line having fits trying to insert tab A into hole B and I've got to fix that before the next run. Thanks for all the help! Bob -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Parker Sent: Tuesday, May 27, 2008 3:53 PM To: [log in to unmask] Subject: Re: [TN] PTH's With Immersion Silver Robert This is very bizarre. I worked for Bell Laboratories many years and installed the first immersion silver line in North America in the AT&T PCB facility. We ran thousands upon thousands of boards through the process. We never had a problem with undersized holes. I suggest you cross-section some holes and measure the drilled hole diameter. Also, perhaps the fabricator placed a layer of some foreign material (i.e. nickel) between the copper and the silver or perhaps over-plated the copper. Best regards Lee J. L. Parker Ph.D. JLP Consultants LLC (804) 779 3389 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert Sent: Tuesday, May 27, 2008 10:57 AM To: [log in to unmask] Subject: [TN] PTH's With Immersion Silver We've been using immersion silver on our boards for quite a while with great success, but in a recent run of a new product, we had the boards come in with the PTH's used to mount RCA and audio connectors smaller that usual. The parts came in on the large end so it became very difficult for the operator to insert them into the board. Both holes and parts were in tolerance and the holes were specified at the recommended diameters. Our CM has a woman who spent 20 years working in pcb fab houses and she tells me that it's not at all unusual to have IS boards with reduced ID's on the holes as opposed to HASL. Has anyone else experienced this? If this is the case, we'll have to adjust for this in the future, but it would be useful to know if this was an anomaly or a normal condition? --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 15.0 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 15.0 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 15.0 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 15.0 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 -----------------------------------------------------