I agree that the drawing should specify "after all plating" which includes your surface finish. Your tolerance includes all metals being applied to that PTH. Thank you, Jim Mahoney Quick Turn Flex Circuits, LLC Applications Project Manager P# 603-821-6571 F# 603-821-5723 M# 603-305-6250 ** This email and all attachments have been scanned prior to being sent** Confidentiality Notice: This page and any accompanying documents contain information that is confidential, privileged or exempt from disclosure and is intended for the exclusive use of the addressee. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of the contents of this information in any manner is strictly prohibited. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins Sent: Monday, July 07, 2008 3:15 PM To: [log in to unmask] Subject: [TN] Flex specifications - tolerance on hole size Hello TechNet A question about through-holes on a flex. We are having some debate about how to interpret a drawing. Specifically, if I have a drawing that says: 1) fabricate per IPC 6013 type 4 2) tin-lead plating shall be per IPC 2221, method optional 3) hole size is specified in the drill schedule as 0.028", plated, +- 0.003" Our debate is about the hole size after plating. Does the +- 0.003" apply to the solder coated hole, or is that a copper only size? Does IPC-2221 specify any maximum solder thickness? I'm an assembler, so unfortunately I don't have these two IPC specs at hand. regards, Graham Collins Halifax Production Engineering (902) 873-2000 ext. 6215 --------------------------------------------------- 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 -----------------------------------------------------