Hi I have to design a Rigid-Flex-Rigid PCB. There are many guidelines about bending radius of the flex. this issue (of the radius) is understood and obvious. I checked about making each flex layer in a different length (book binder), and I've got from the manufactures that this is a very problematic and expensive process. My problem is that if all flex layers are same length, the bending radius won't be as expected, especialy the important dimensions that I've attached in the figure (actual_bending.jpg). https://skydrive.live.com/redir?resid=718E79F4BDE0B70!209&authkey=!AFEmaMzHCVjUnL4 (3 images: 1) original rigid-flex-rigid, 2) desirable bending form and 3) actual bending form with X and Y dimensions 1. how do I calculate the X and Y dimensions? (see actual_bend.jpg) 2. is the bending form I'll get is legit?