we simply specify finished pcb thickness of typically .031", .047" or .062" all with a +/- 10%. The pcb manufacturer we often deal with helped us determine the feasibility of this note. Their input was that the 10% tolerance is standard. We dont usually specify the finished over copper or pcb with mask only, etc... Our products and customers are not too stringent and have never given us any trouble with our thickness specifications. Lenny ERG www.ergpower.com ----- Original Message ----- From: "Phil Nutting" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, April 25, 2008 3:51 PM Subject: [TN] Specifying board thickness Hi Technetters, We are reviewing how we specify finished circuit board thickness to make sure we get what we think we specified. Recent events have placed what we specify under scrutiny. I've looked through IPC-2221, IPC-2222, IPC- 4101B, IPC-6012B and IPC-7351A with no luck. Currently our documentation calls for 0.059" finished board thickness without measuring the thickness of the copper. Presumably when the copper is added we get to 0.062" finished thickness which is important when we start stacking circuit boards on standoffs. How do others specify circuit board thickness? Is there an IPC spec I can quote chapter and verse? Thanks in advance. Phil Nutting Design for Manufacturing Engineer Kaiser Systems, Inc. 126 Sohier Road Beverly, MA 01915 voice: 978-922-9300 x1310 fax: 978-922-8374 e-mail: [log in to unmask] www.kaisersystems.com Note: All the information contained in this e-mail and its attachments is proprietary to Kaiser Systems, Inc. and it may not be reproduced without the prior written permission of sender. If you have received this email in error, please immediately return it to sender and delete the copy you received. --------------------------------------------------- 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 -----------------------------------------------------