General rule is 10 to 12 times the thickness of the circuit. This rule holds well for most circuits up to 4 layers. For simple flex to install you can actually crease the circuit as long as it is not creased and uncreased in the engineering phase. Regards Steve Kelly -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Doug Pogatetz Sent: Tuesday, January 29, 2002 4:00 PM To: [log in to unmask] Subject: [TN] Minimum bend radius calculation in a flex circuit I am on project that requires that I determine the minimum bend radius of a flex circuit. I have not been able to find out any formulas or calculations to help out. I am a mechanical design engineer, so I am not up on all the terminology. It will of the class "Flex to Install", and will be of the adhesiveless type. Can anyone help out? Thanks. Doug ---------------------------------------------------------------------------- ----- Technet 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 Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet 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 Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------