without knowing the details, Joseph Fjelstad's book "flexible circuit technology" might be a good guide. best of luck. jk On Jan 22, 2020, at 2:36 PM, Decker, Scott Collins wrote: > Victor, > OK, I'll take a stab at it since all you go so far is > ZZZZZZZZZZ's :-/ Since I didn't find anything in the documentation > I had access to that would cover this, my guess is what the master > drawing states and if that isn't covered on the drawing, the vendor > should have data for this issue. It sounds like the amount depends > on the squeeze out of the resin in the rigid flex interface area. > The fact that it's not even may be due to the copper in the area > which may make it unpredictable to some degree. It's interesting > that there was no simi-rigid strain relief at the interface since > that squeeze out creates that knife edge issue and can cut the > cover layer, etc. I know this isn't the best answer and may not in > fact BE an answer, but it is a slightly educated guess at best and > not ZZZZ's. :-) > On a similar note, a few years ago I had a rigid-flex design > that the manufacture had routinely put the strain relief on the > edge even though I didn't have it called out on the drawing. I > figured it was standard practice. WRONG! We had sent the design to > another vendor and when we got them back they didn't have the > interface area covered. When I questioned them on it they just > said, "it wasn't on the drawing so we didn't do it". Note to self, > put it on the drawing if you want it there no matter how nice one > vendor is, there is always another that doesn't see it that way... > Oh and speaking of seeing it, there was another process to get > pictures posted to here but I don't recall who was doing it, > perhaps they will chime in on that now also? > > Scott Decker | Senior Engineer, PCB Design Services CID+ | > Electronic Systems Center > COLLINS AEROSPACE > 3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A. > Tel: 602 308 5957 FAX: 602 243 2347 > [log in to unmask] www.collinsaerospace.com > [collinsaerospace.com] > KE7MWT > CONFIDENTIALITY WARNING: This message may contain proprietary and/ > or privileged information of > Collins Aerospace Systems and its affiliated companies. If you are > not the intended recipient please 1) do not disclose, copy, > distribute or use this message or its contents, 2) advise the > sender by return e-mail, and 3) delete all copies (including all > attachments) from your computer. Your cooperation is greatly > appreciated. > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of > [log in to unmask] > Sent: Wednesday, January 22, 2020 11:14 AM > To: [log in to unmask] > Subject: [External] [TN] FW: IPC-2223D, Sectional Design Standard > for Flexible/Rigid-Flexible Printed Board > > Fellow Tech Netters, > > Perhaps it was too early in the morning for Rigid Flex PWBs > questions. > Therefore, I post the second time in hope that everyone is awake. > > I send some pics to Steve Gregory mail box. > > Victor, > > From: Hernandez, Victor G <[log in to unmask]> > Sent: Wednesday, January 22, 2020 6:01 AM > To: TechNet E-Mail Forum > Cc: Hernandez, Victor G > Subject: IPC-2223D, Sectional Design Standard for Flexible/Rigid- > Flexible Printed Board > > Fellow Tech Netters, > > I would like a clarification on the above stated standard. > Post Router Process: > > * How much PWB laminate material flashing is allowable exiting > the rigid flex construction. > * One side measures 5 mils and the other 25 mils. > * No Strain Relief Fillet material utilized. > > Where can I upload pics? > > Victor,