Hi Bob, If you haven't visited the IPC DC website lately, there is a special discount offer to Designers that are members for the IPC specs and DC materials of interest to us as designers... http://www.ipcdesignerscouncil.org/DCmembership/profmem.htm <http://www.ipcdesignerscouncil.org/DCmembership/profmem.htm> Once the page opens, click on 'design-related standards' and it will open a PDF style form you can fill out to order your specs at a discount... Best regards, Bill Brooks - KG6VVP PCB Design Engineer , C.I.D., C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Harter, Robert [mailto:[log in to unmask]] Sent: Friday, October 15, 2004 8:02 AM To: (Designers Council Forum); Brooks,Bill Subject: RE: [DC] IPC Flatness and Callout of Standards to Use in Fab Note s. Bill, Thanks, that is exactly what I was looking for. I knew there was an IPC spec but without direct access to their standards I was hard pressed to find the information. Hopefully one of these days my employer will see the advantages of joining far out weigh the cost. Bob Harter, Jr. PCB Designer Paratek Microwave, Inc. 6935 G Oakland Mills Rd. Columbia, MD 21045 PH# (443)259-0140 x278 CP# (443)739-8407 WWW.PARATEK.COM -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Brooks,Bill Sent: Thursday, October 14, 2004 22:30 To: [log in to unmask] Subject: Re: [DC] IPC Flatness and Callout of Standards to Use in Fab Note s. Hi Robert, This is the note I use to cover board flatness and bow and twist for surface mount components on glass/epoxy laminate multilayer boards. BOW AND TWIST SHALL NOT EXCEED 0.75% (.00075 IN PER IN) IN ACCORDANCE WITH IPC-A-600F FOR SURFACE MOUNTED BOARDS WHEN MEASURED USING IPC-TM-650, METHOD 2.4.22. I hope that helps... Best regards, Bill Brooks - KG6VVP PCB Design Engineer , C.I.D., C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Harter, Robert [mailto:[log in to unmask]] Sent: Thursday, October 14, 2004 4:05 PM To: [log in to unmask] Subject: [DC] IPC Flatness and Callout of Standards to Use in Fab Notes. Hi All, I am writing to ask what is the IPC tolerance for how flat a PCB must be and what callout should I use in my Fab Notes? This PCB is going to be part of an RF Filter module that will be SMD. I made an inquiry a few weeks ago about best practices to employ for designing a flat board that has a 25mil 6010 top core and 2 FR-4 cores for control routing. Thank-you all again for the great timely advice on that question, now I'm just trying to make sure the Fab house and I are on the same page. Bob Harter, Jr. PCB Designer Paratek Microwave, Inc. 6935 G Oakland Mills Rd. Columbia, MD 21045 PH# (443)259-0140 x278 CP# (443)739-8407 WWW.PARATEK.COM <http://www.paratek.com/> This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email or [log in to unmask] and destroy all copies of the original message . ------------------------------------------------------------------------ ---- ----- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. 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