Crash Makerspace
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Reimagining Locking - News Update
🕑 Added 2023-07-30 15:42:59 +0000 UTCI want these blades to have extremely fast ejections as it looks awesome, but magnetics were not able to keep up with the increased velocities of recent models; the blade is now bouncing back in before the locks can bite in. I've been a bit quiet the past 2 weeks as I'm trying to derive a mechanism that allows for instant lock-bite while being low enough friction to allow gravity locking. Other AC blade designs don't have this problem as they are all slow ejections on low mass blades or ratio'd blades like scissor lift or gear based so they take as long as 500ms to fully eject.
An inherent problem with traditional OTFs is that for a faster lock bite, the harder they have to pinch and scrape the blade. This means if an ejection is incomplete, you have to manually pull the blade to lock as it takes energy to push drag the blade through the locks.
Comments
Crash Makerspace
Yea totally! My YouTube analysis episodes show the ways that parts go together too for previous prototypes
Martin Laloshev
It would have been good to have assembly tutorial. When you finish the project :D
Crash Makerspace
Sounds like one awesome bottle opener haha ā but yes recent models have relied on magnetics where my earlier ones were based on standard spring loaded lever locks! Iām tryin other concepts currently to see if I can derive something niftier
Dan Erickson
Looks like you were relying on magnetic repulsion to actuate the locks. Or maybe a bistable magnetic detent? Either way, I think the magnetic concept has legs since, as you say, it can reduce/eliminate friction on the blade. My interest is pretty niche/silly (a Hidden Bottle Opener š), but it basically requires the hardness and stiffness of a metal blade. That's had me thinking about the idea of a metallurgical magnetic lock. Most Stainless Steels are non-magnetic, owing to their austenetic crystalline structure. But work hardening can shift the structure to martensite. That means it is possible to have localized magnetic areas on an otherwise non-magnetic blade. (Cheap stamped "bar blade" bottle openers often have this property at the stamped cutouts.) This might allow a small cylinder magnet to ride/roll nearly frictionless along the austenetic edge of the blade, but snap into a martensitic detent at the end of travel, without need of any spring. š¤·š» Maybe worth a thought. At any rate - I'm looking forward to seeing the next iteration of files. But in the meantime, I'll try running the current models in PA11 using SAF technology. When you have a design that you feel is ready, I'd like to send you a copy as a thank you for your efforts!
