#video #lecture 12 part 3 on #mechanisms of #flexures. #toread
on 02026-06-17#video #lecture 8 part 1 on #mechanisms of #flexures. #toread
on 02026-06-17#video #lecture 9 part 2 on #mechanisms of #flexures. #toread
on 02026-06-17#video #toread about #flexures and resonance (maybe watchmaking-related?)
on 02026-05-14#paper about spherical #flexures #mechanisms by Jelle Rommers
on 02026-05-08#video of #flexures for #3D-printing a sort of 50-gram plastic carabiner for a #manufacturing competition at “Maker Retreat”; it broke at 1.1 tonnes.
on 02025-09-13#Marco-Reps #video on #precision #metrology for evaluating his open-source ADR1000 voltage standards. He ends up #3D-printing #flexures out of ASA for its low creep to preload copper-on-copper rotary-switch contacts to try to keep oxidation down. His stator contacts are bare copper on an aluminum PCB. #electronics #hardware
on 02024-11-12#video about #3D-printing #flexures #mechanisms with mostly the same standard flexures popularized by BYU that everyone shows.
on 02024-10-02#video about spherical #flexures #mechanisms by Jelle Rommers
on 02024-10-02#video #toread about designing #flexures (37') #mechanisms
on 02024-10-02#video #toread on #wire #flexures about an airpot #mechanisms
on 02024-10-02#video #toread #Disney-Research on kinetic #wire character design #flexures #mechanisms
on 02024-10-02#video #lecture 9 part 1 on #mechanisms of #flexures. Hopkins demonstrates how to analyze serial flexures as combinations of parallel flexures, showing that a bent blade flexure is kinematically equivalent to a wire flexure.
on 02024-10-02#video of #Gelbart mostly about spot welding. He recommends 15–25 kVA spot welders at 2½ volts with 5000 amps, for 1–4 cycles for thin ferrous sheet metal, up to 10 gauge, and up to 12 cycles for mounting hardware like screws or, with a conical-hole electrode, balls for kinematic mounts. I’m guessing a “cycle” is 16⅔ms. Talks about how to spot-weld #nitinol into #flexures. Recommends tungsten/copper or chrome/copper alloy tips for your electrodes. #manufacturing #precision
on 02024-09-21#video of #Gelbart mostly about how to use adhesives, especially silicone, epoxy, polyurethane (e.g., Gorilla Glue), and spray contact cement. Also talks about #flexures for clamping things. And how peeling-mode failure kills adhesive joints, though less so if you use flexible adhesives. #manufacturing
on 02024-09-21"Kiriform" #pop-up deployable #flexures #mechanisms #video showing applications including furniture, luminaires for lighting, zoom lenses, etc. It depends on buckling (and therefore some kind of constraint to keep it from buckling the wrong way) and doesn’t look very rigid. “Deployable structures based on buckling of curved beams upon a rotational input” by Saurabh Mhatre et al.
on 02024-09-10#Breaking-Taps #video about #MEMS accelerometers. He uses a lot of electron #microscopy to show the #flexures and other #mechanisms, then makes macroscopic replicas with #3D-printing. I don’t understand the whole flexure layout, but I appreciate the effort. He says the “gyros” use the Coriolis force generated from resonant vibration, which changes their resonant frequency. I don’t know. #toread
on 02024-09-05#video on how to design #flexures for #3D-printing. Unfortunately it’s pretty much just the same Snijlab living hinges and BYU CMR #mechanical things everyone makes, though BubsBuilds designed a flexure fractal vise. Recommends using nylon for FDM because it’s less vulnerable to fatigue than PLA, or PETG if nylon is too hard to print. Also make sure your slicer doesn’t position layer seams in the flexure blades, or change the number of perimeters there. Also you can adjust flexibility by changing the number of perimeters, i.e., “wall loops”. He also points out that short blades are more demanding and that you should use fillets.
on 02024-06-24#3D-printing #video on #print-in-place #flexures #mechanisms that shoot a toothpick
on 02024-06-10#video #mechanical #clickbait high-precision speed-reducer uses rope. This is a variant of the Jacob’s ladder rolling flexure pivot, with the variant that one of the rollers is a tiny capstan and therefore the angular velocity of the actuated joint is much lower than that of the capstan itself. Cable drive means limited range of motion, but you get a lightweight joint with no backlash and hopefully little wear. #flexures
on 02024-05-31Marcel Thomas’s #flexures page #mechanical
on 02022-02-11Jonathan Brigham Hopkins’s FACT thesis from 02007 #flexures #PDF #mechanical
on 02022-02-11This is the Disney Research paper that transforms rigid linkages into flexure-based linkages: A Computational Design Tool for Compliant Mechanisms, by Vittorio Megaro, Jonas Zehnder, Moritz Bächer, Stelian Coros, Markus Gross, and Bernhard Thomaszewski, 02017 #PDF #flexures #mechanical #mechanisms
on 02022-02-11Marcel Adam Craig Thomas’s 02014 master’s thesis, “Design of non-serial, non-parallel flexural transmissions as applied to a micro-machined MEMS tuning fork gyroscope” #mechanical #flexures #ebook
on 02022-02-10the Zenith Defy Lab ZO 342 #mechanical wristwatch’s oscillator uses silicon #flexures that oscillate at 15Hz, designed by Guy Sémon. They are cut with deep reactive ion etching.
on 02017-10-01Polypropylene living hinges are long-lived #flexures that experience large deformations.
on 02017-03-11#metamaterials (“mesostructures”) via #3D-printing in order to achieve customized and graded elasticity. Still, they seem to just be replacing struts with coils, mostly, although there are some other #flexures mentioned. #manufacturing
on 02016-09-22#pdf #paper on “Multiple-Material #Topology-Optimization of Compliant Mechanisms (#mechanical #flexures) Created Via PolyJet #3D-Printing”. It says that multiple materials has the potential to eliminate the need for thin, weak sections. (PolyJet is a process that selectively deposits either of two liquid resin monomers and polymerizes them with UV. One of the resins is an elastomer.) Their results do not seem to justify that level of enthusiasm, as they still contain thin, weak sections, and they don’t seem to have measured the output force. #manufacturing
on 02016-09-22how to design panels to make on a #laser-cutter or other #CNC #manufacturing machine to be assembled into things, including inside corner divots, clips, finger joints, box joints, coplanar joints (including fully interlocking bulbed versions), Kanelba hinges, #flexures including the Snijlab living hinge (aka the lattice hinge), and whatnot. #2d-cutting
on 02015-11-12“No test has ever worn out a properly designed and molded [living] hinge of homo-polymer polypropylene”. #flexures #manufacturing
on 02015-08-16Roderic Lakes’s #bibliography on composite #metamaterials that can have either negative or colossal thermal coefficients of expansion (#TCE) even if their components don’t. This is potentially useful for making nanometrically-precise #flexures without resorting to exotic materials like #Invar or maybe even metals.
on 02015-08-12Advantages of Heli-Cal’s machined #spring helical #flexures over some other kinds of couplings.
on 02015-08-12Commercially sold #flexures.
on 02015-08-12