The ends would have stiffener added to terminate the flex ribbon section. The corner that sits behind the moving z-axis tool head would adhere to the x-axis shuttle that moves along the gantry (probably on sleeve bearings). The total length of the flex ribbon is the most extreme end-distance required in addition to the corners and bends. The example below only shows two axes of motion here, and the gantry itself would move in the Y-axis. Naturally, the example below would be laid along the X-axis gantry, and the z-axis tool head travels along it. In smaller, sleeker packages, a flex ribbon makes more sense as it provides a low-profile assembly as well as the required motion. In physically larger systems where electronic components need to follow the same motion as a mechanical element, this would be accomplished with separate rigid boards or modules, and these would be connected with cables. ![]() Dynamic Flex Application Examples Mechatronic GantryĪ very typical dynamic flex application, such as you might find in a 3D printer or CNC machine head, is a mechantronic gantry. ![]() On this note, let’s look at some rigid-flex PCB applications and design examples to see the issues that spring to mind when designing flex circuits. You may, of course, lean on both of these reasons for justifying the use of flex circuits. ![]() There are two basic reasons for designing a flex circuit into your product: to build a compact and efficiently assembled device, or to make the circuit dynamically integrated with the mechanical function of the product.
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