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Flex PCB Design - How to calculate inner radius when only outer radius is known.

JFuoco

When adding bends in a flex PCB design, how can we calculate the necessary inner radius if we have a specific outer radius in mind?

Intuitively I would think the outer radius = inner radius + flex pcb thickness, which would be pulled from the stackup. But that doesn't seem to be how it is calculated.

For instance, a simplified model shown below. Here, the flex PCB is 0.25 mm thick. We want to fit a 6.00 mm curve, so we easily calculate the inner radius as 5.75 mm.

tldr: how does Allegro calculate the difference between the inner and outer radius on a bend?

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  • RFinley

    Why would the inner radius be much different from the outer radius?  The thickness would just offset the x,y 

  • JFuoco
    in reply to RFinley

    Agreed that it won't be much different, but for the sake of the design I'd like to have the numbers as close to reality as possible. Trying to keep things precise.

  • steve
    in reply to JFuoco

    You are probably better asking the Flexi PCB fabricator. They should be able to give you the exact calculations used.

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  • steve
    in reply to JFuoco

    You are probably better asking the Flexi PCB fabricator. They should be able to give you the exact calculations used.

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