1/30/2024 0 Comments Flexture design![]() Paul Wallace has updated the project titled Rigol DS1054 Viewer/Controller.Paul Wallace has added a new log for Rigol DS1054 Viewer/Controller.Raphaël has updated the log for Little Monster.Raphaël has added a new log for Little Monster.Jan liked Ai Honey Bee Swarm Detector / Predictor System.YGDES on Get That Dream Job, With A Bit Of Text Injection.Edwin on Get That Dream Job, With A Bit Of Text Injection.Dan on Prompt Injection: An AI-Targeted Attack.Floydian Slip on Get That Dream Job, With A Bit Of Text Injection.Dan on Get That Dream Job, With A Bit Of Text Injection.m1ke on Two Factor Authentication Apps: Mistakes To Malware.m1ke on Prompt Injection: An AI-Targeted Attack.Ewald on Prompt Injection: An AI-Targeted Attack.The deviation a flexure can get through twisting should never be huge anyway, though it can look worse on the end of a long straight object, but holding both ends or at least nearer both ends will cut the amount of deviation possible to damn nearly zero. So perhaps try using something like spring steel flexy bits attached to the 3d print in this case – allowing you to define how stiff the spring needs to be easily, get a greater range of movement without deformation from a smaller flexure arm length as spring steel is a much better material choice for the role (in general).īut if you really need stiffness at the rear end of a pen holder like that really simply better off having another flexure holding the top of the pen too – making it very much harder to twist (beyond enough to accommodate the tolerances in production). But it should be reduced somewhat by making the flexure thicker in Z, and perhaps stiffening the x-y flex arms or adding more of them if the design specs allow. That sort of wobble will always exist to some extent – the flexure parts will twist some. Posted in 3d Printer hacks Tagged 3d printing, flexures, living hinge Post navigation Do you have any project which have used flexures like this? Our writeup last year on the Martian helicopter Ingenuity has a good picture of flexures, metal not plastic, which are integrated into its landing gear / legs. ![]() We wrote about 3D printing of living springs before. On the other hand, yours truly has a small Tupperware pocket stamp container that’s well over 20 years old whose living hinge has yet to fail, so maybe they aren’t such a bad thing if done right. This approach is basically a living hinge of sorts, so there could be some longevity issues. Also note that since the spring force only needs to act in one direction, pushing into the paper or other working material, the spring design is asymmetric. Even though printing springs of a precise force may be trial and error, at least 3D printers are good at making precise and repeatable thin-walled structures. We’re not sure how many iterations were required to arrive at this number - perhaps those mechanically inclined readers can offer up equations to predict the spring force ahead of time for a particular geometry. If you ask the tendon supplier, they will often give you the plate design for the particular anchor design load and span.’s experiments showed that leaf-spring-like segments with a thickness of 0.4 mm provided the desired amount of force. The plate thickness for a 5-strand, 176 kip DL anchor was 2.75 inches. The steel for the bearing plates had Fy = 50 ksi. The tieback design loads were generally in the 200 to 400 kip range. The bearing plates spanned approximately 1'-5". The attached picture is from a recent tieback anchor project. The larger the diameter of the wedge plate, the less load is applied to the middle of the bearing plate. I would expect a bearing plate for a 5-strand tieback anchor, spanning 250mm to be about 60 - 75 mm thick with Fy = 36 to 50 ksi. The stiffness of the wedge plate causes the anchor load to be applied to the bearing plate closer to the ends of the plate's span. Because the anchor's wedge plate is relatively thick and stiff, the anchor's load to a simply-supported bearing plate is not really a distributed load.
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