Mea culpa for neglecting the right ears of headphone listeners! Unfortunately, there’s no way for me to fix it on this upload (that I’m aware of, if you know a trick for this, PLEASE let me know!) But I changed the defaults in my recording software to (hopefully) make sure it's fixed in future videos to force right ears to endure my voice too. Huge thanks to the folks that gave me the heads up! Fun additional tidbit from @keenheat3335, who pointed out that this type of mechanism goes back to a 'whippletree' mechanism (en.wikipedia.org/wiki/Whippletree_(mechanism)), which were/are used for balancing the pull force of draught animals! Also, from the Wikipedia article, apparently these are also the basis for the mechanism behind most windshield wiper blades...so cool!
Nicely done! By any chance, did you attempt using the 'flexure pivot' (or some off-axis equivalent)? Just in case, here's a link to a pic shown in wikipedia: en.wikipedia.org/wiki/File%3AFlexure_pivot.png
this mechanism is actually a variation of whipple tree mechanism. Which back in the drawn horse wagon day, was used to distribute the force evenly between horses. Since not all the horse have the same pulling strength. Stronger horse will naturally shift closer to the center of the pivot and weaker horse will move farther. So the net torque balance out and the horse wagon won't start to tilt and can go straight even when you have multiple horse with different pull strength.
@@bubsbuilds in modern day, you can find this mechanism used in windshield wiper, telescope support, multi edge pizza cutter, etc. Basically anytime you either need to distribute a force evenly across a multiple points or need to concentrate multiple force into a single point. This mechanism can be use. So you technically retrofit multiple windshield wipers into a fractal vise. Since the mechanism origin is the same
@josephr5804 Thanks! If you haven't come across it before, this channel is one that has some great flexure builds, www.youtube.com/@TheFACTsofMechanicalDesign . Hope ta catch ya on the next live stream! Cheers
I wish my maths teacher had brought these into the first lecture we had about fourier series. It still amazes me that you can reproduce any curve by adding together a bunch of cos or sine waves. the vice basically does the same thing - the target "curve" is the side of the object you want to clamp, and your frequencies are each size of fractal. Seeing how the vice works would have done wonders for my belief in my maths lecturer. anyhow, 30 years too late, now I know! thanks
This was a fun video, and I get the love of the vise, and the limitations! Your skill and understanding have been very beneficial to seeing the same goal, but through different mechanisms! I am stoked to see how this adventure goes!
Try the first one in a mix of tpu and play where only the joints are tpu. I'm thinking you can print it in tpu and snap a pla exo skeleton on the parts that shouldn't flex.
@freedomcaller I definitely think this could be a workable option. Might be tricky to keep the joints from adding up to a fair bit of play in the assembly, but maybe some tapered dovetail connections or the like could keep them snug. May indeed have to play around with this a bit, thanks for the suggestion!
@kevingallineauii9353 For some reason, that didn't even cross my mind! Very true, that should work just fine. That CA joint will likely be the strongest part of the linkage.
Saw one video a bit ago about an old vise that uses a row of linearly moving square pins with a pocket of small ball bearings at the back to equalize the load (so like a hydraulic oil would, sans all the sealing issues). Seems like it might be easier to fabricate.
@maximthemagnificent I've seen a couple of those as well! (this is one of the videos I've seen on that type of design: ua-cam.com/video/JaHjFL7NZlU/v-deo.html ) And very fair point, that may indeed be an alternative for me to try out, thanks for reminding be about those gems!
One day, if I ever get good at machining, I'd like to build a metal fractal vise. They are legitimately one of the coolest tools ever. However, a 3D printed one has a certain charm to it.
For the first design, you could try using a finer nozzle to reduce the web thickness. I use a 0.25mm nozzle for detail work, which if you're intent on keeping the double wall would get you to about 0.4mm web thickness. Or you could go with a single wall for a 0.2-0.25mm web. You could also go with a multi-part construction, using a TPU web slotted into the PLA bars.
Flexures can also do non-local rotation like the dove tails. If you have two parallel blade flexures connected from a fixed base to a moving element, then the rotation origin is at the intersection of their extensions. If the blades are parallel they are said to intersect at infinity and thus rotate around infinity. A rotation with an infinite arc radius is a translation.
@paulroberto2286 glad I'm not the only one that gets satisfaction from the motion on that one! And sorry for the non-consensual tickle 😁definitely not intentional, but not gonna lie, your comment made me feel less bad about it cause that's kinda funny :)
I'll be real, my fractal vice is just foam. It's more stable than a 3D printed fractal device, easier to work with, but it's also cheaper. Not all foam works perfectly sure, but there's enough good options not to care too much. Maybe I should consider making it compliant in only one dimension, but that ruins the simplicity of my genius design.
You could probably make a fairly stiff yet compliant flexure with properly cured tough resin printed models. Resin printing could also allow for way more hierarchy levels and if you really want to go the extra step you could print the model in wax resin and vacuum cast it in metal
So i think the main reason for the pivot to be infront is to make sure its self aligning. With it further back, it can potentially move in the opposite direction and jam well interfering with the other parts
@@bubsbuilds worst comes to worst set your audio to mono, atm your problem is you've only recorded one audio track but it's in stereo therefore only one ear has audio. You can also duplicate said track to the right channel, but you haven't really got stereo audio going on so just switch to mono.
Ah this is so cool to see. Thank you for taking us along on your journey! I mulled over a flexural fractal vise when videos of old mechanical versions hit the internet a few years ago, it's really neat to see your progress on this. Learning that you can pull the pivot back from the nominal vise face is an important nugget! One thought is to use crossed beam flexures, where two leaf flexures overlap at 90 degrees at their midpoint. I've found that configuration to be superior to both notch and simple leaf flexures if you're trying for a pivot; better range of motion than the former, better off-axis rigidity than the latter. Printing them monolithically requires a bit of support material but if you leave a gap between leaves it comes out easily enough.
Another thought on printed flexures: I've found PETG to be a good compromise, it's not as floppy as TPU but holds up better than PLA. An interesting (if slightly concerning) effect I've seen in many of my printed flexure projects, particularly those with large angular displacements, is audible hysteresis. If you flex the leaf one direction and listen carefully, you may hear a very faint hiss; do it slowly enough and you may hear tiny pips and pops, perhaps from thousands of tiny stick-slip interfaces sliding past each other. I think it's from adjacent layer lines moving slightly relative to one another. What is interesting is that if you bend the joint again in the same direction you won't hear the noise; you have to "reset" it in the opposite direction, at which point yoi can hear it again. Interesting, but also concerning! At high speeds, will this rubbing be a source of heat which degrades the flexure? Does this point towards an impractically short fatigue life? Are the flexures changing enough between strokes that they lack the repeatability the flexure-obsessed among us love so much? Anyhow, let me know if you ever notice a similar phenomenon.
If you're using the material itself as a spring for holding power, you need to make the pivots slightly stiffer in each layer as you move from the grabbers to the base.
Very neat investigation and idea to open up more flexible workholding for those not made of money or already a capable machinist with workshop. I'd like to see some grip strength and deflection tests on these designs though as I suspect as they stand they are going to be difficult to use. Maybe even all but useless for anything but hand work - as any powered tool you'll lose the feel for how much the vice and object has deflected if the deflection is as bad as it seems. However if you just slightly bias the sides to push down against the vice rails so the object to be gripped is then pushed against it I suspect it would be more effective - in effect you have a few points of 'fixed' contact the part is being pushed against by the compliant mechanisms. This probably can be as simple as just mounting them with a bit of angle, but I suspect it would be more effective to add another deliberate flexure element so as pressure is applied they want to always rotate towards the vice body or in this case rails.
Wow, you came up with 2 _great_ alternatives! I feel like your final could be print in place, if some amount of backlash/ slop of each fractal jaw is allowed.
Flexures are so underutilized, very nice designs! I wonder if you could get a thinner flexure by printing the notch flexure web in the plane of the print bed. Might lose some strength but you could scale the thickness with layer height instead of wall thickness then and maybe get some thinner webs
This is really cool! I’d like to adapt a TPU version specifically to clamp violin plates in place on a bench for carving.. I’m sure other instrument work holding vise and vise-adjacent workholding can be made!
@ethan_becker you know I'm far too impatient for that :) But very true, printing with a 0.8 nozzle and then complaining about thick notches may not be ENTIRELY reasonable, haha.
Cool👍 maybe try connecting each flexor unit to its neighbour to reduce the sideways movement. That energy would be transferred forward to the teeth instead of sideways, which would give strong grip. It’d also force the teeth flexors to flex more, providing greater local holding force.
@dingodog5677 That's an interesting one, I'll have to think that over a bit! I'm guessing there'd be a way to do that without over constraining them, probably just with adding another pivot at each of those new connections, but may also would need some translation freedom to allow the teeth to rotate freely. Interesting indeed! Thanks for the suggestion and food for thought!
@@bubsbuilds can you use something like a rubber band that just puts some tension between them. Might have to try a few different types to get the right set up.
I really wanna see a version that's using many more iterations to much more finely fit any shape. I'd also like to see a "3D" version that can fit shapes in *two* dimensions. For the flexure version, is it possible to increase the range of motion by "stacking" leaves in alternating layers so they can "move through" each other? Kinda like shuffling cards by pushing half a deck into the gaps between cards in the other deck
Absolutely awesome project and highly interested in the TPU version - for delicate wood pieces. I'm seeing the TPU version's lateral flex being reduced/eliminated by being sandwiched between 2 horizontally mounted rigid plates (contain the flex).
@josephpk4878 Love these ideas for use of the TPU version that are way outside of anything I'd considered! If you decide to give the sandwiched version a try, I'd be super curious to hear how it comes out! This version is flat on both sides, so it may be a good candidate: www.printables.com/model/690825-flexure-fractal-vise-jaws
I remember a time when you could set mono or stereo and the one time I actually wanted to swap it to mono there's no option. Great video though, no worries on the sound errors
I wonder if it wolud be worthwhile making the outer leaves of the flexure version a bit stiffer than the inner leaves, to counteract the tendency of the vise to splay outward? Or if it was shaped with a concave curve on the face rather than being flat?
Awesome video. For the TPU fractal pieces could you make all but the last out of something stiffer and then leave then do the contact pieces out of TPU. In the last design you showed could you pin in TPU pieces?
@maxwell_edison Very fair point, and true, but to be honest the response has been pretty good despite my audio ignorance, and I can't bring myself to discard the comments and such (wouldn't have known without them that this mechanism is called a "whippletree", and I just love that). So for now I'm ok with letting my poor editing skills shine :) But I do appreciate the suggestion, and I'll definitely mull it over, thanks!
Have you considered printing it upwards and swapping material on the final smallest fractals with TPU? It might work better having the stiffness of PLA with the TPU for holding
@Raye938 Does it count if I'm just chronically late on replying to things? :) To your question, I do think something with swapping out for TPU on the small elements may work well, but my main concern with going that route would be that the stress in the flexures would then be going directly along the print lines and may break...but admittedly, I don't have anything to back that up other than a hunch :) An alternative suggestion I saw from someone that may accomplish a similar thing would be to make the flexure pieces separate altogether and glue them in with some dovetail joints or the like, which I think would probably work pretty well for mixing and matching materials (and could also allow you to have the 'teeth' be TPU also). But in general, I do like the idea of being able to have the last layer made of TPU while keeping the rest PETG (my preferred material for this sort of stuff, just so I don't have PLA splinters flying everywhere when I inevitably push it too far). If you decide to give it a try, I'd love to hear how it goes!
@rosserobertolli I haven't, and if you do, I'd love to see it! That was actually what I sat down originally to sketch out when I ended up going down the flexure path instead. I definitely think that'd be cool!
A mediocre suggestion: for the initial design you mentioned not wanting to thinner than 2 wall thickness. I'm assuming you used a 0.4mm nozzle? Could you not get thinner with a 0.2mm nozzle?
@Shayeta Actually I typically print with either a 0.6 or 0.8 nozzle I'm quite impatient and not typically too concerned with fine details :). But I absolutely could get thinner in the notches if I swapped down to something like a 0.2. But I would start to worry about over-stressing the material if pushing the web thickness too thin. Metal flexures with webs that thin can handle a fair bit of load still, but I suspect printed hinges that thin would deform pretty easily. One of these days I'll have to dust off the smaller nozzles and give it a go.
why not just 2 stiff rubber bladders with reinforcement ribs only allowing it to compress and flex in the compressive direction and not bulge out or aside? the more the bladder is compressed in one point, the higher the total pressure, and grip on the contact area. but its also compliant.
@BartJBols I think that absolutely could work! I've seen some adaptive vises that use a sort of similar, but different concept. This video by "Make Everything" has a great example of one ua-cam.com/video/JaHjFL7NZlU/v-deo.html . But your concept may be an easier one to build, definitely an interesting idea!
@RandomAccountHolder That's actually what I set out to make when I got distracted by the idea for the flexure-based design. For it to really count as PIP, I guess I'd need to not be lazy and actually include the 'vise' components too, eh? :)
Without a MMU or multi material setup you should be able to print some blades with PETG or some other less compliant plastic. You could then tune the deflection of the fractal vise to the application by swapping out blades. You wouldn't need it in all the flexures just the larger supporting ones. You could think of it as adding bones to mass of muscles or that last constraint to fusion so it stops complaining that it's not fully constrained. >----- *==== ||--- *==== >----- You would want the reinforcing blades in the double line areas and avoiding any of the corners. UA-cam doesn't use a uniform font or I'd do better ascii art ya that's my excuse at least it's not ai art though.
I wish SOMEBODY on UA-cam world go into detail on flexure design. Everyone I've found either just shills for a product or a university course, or flakes out after showing a couple of hinges or just one design, or is just demonstrating a selection of existing designs found on thingiverse without explaining anything.
@claws61821 Have you seen this lecture series: ua-cam.com/video/j1lT1RtKnms/v-deo.html&pp=iAQB . That channel has quite a bit of great content on flexure design and concepts. Also, I'll definitely keep the comment in mind next time I'm making a video on a project that includes flexures and try to dive a little deeper on the details of the flexure design!
@@bubsbuilds I think I had forgotten about that one after meaning to watch it some time back. I have watched some of his other videos and found them somewhat hit or miss for my low level of relevant knowledge
Mea culpa for neglecting the right ears of headphone listeners! Unfortunately, there’s no way for me to fix it on this upload (that I’m aware of, if you know a trick for this, PLEASE let me know!) But I changed the defaults in my recording software to (hopefully) make sure it's fixed in future videos to force right ears to endure my voice too. Huge thanks to the folks that gave me the heads up!
Fun additional tidbit from @keenheat3335, who pointed out that this type of mechanism goes back to a 'whippletree' mechanism (en.wikipedia.org/wiki/Whippletree_(mechanism)), which were/are used for balancing the pull force of draught animals! Also, from the Wikipedia article, apparently these are also the basis for the mechanism behind most windshield wiper blades...so cool!
Ahh, that would by why I don't hear anything. Right speakers on laptop don't work.
And I just thought you were recording your voice one room to the right for a cool 3D effect :)
Haha, well I got lucky. I watched over my lunch our at work and I usually only keep one earbud in, this time it happened to be my left 😃
Nicely done! By any chance, did you attempt using the 'flexure pivot' (or some off-axis equivalent)?
Just in case, here's a link to a pic shown in wikipedia:
en.wikipedia.org/wiki/File%3AFlexure_pivot.png
crazy I happened to be only using the left side and didn't notice untill you mentioned it
my left ear really liked this video.
I love this joke, especially considering how it just hasn't changed the entire time UA-cam has existed.
I just happen to be only wearing my left earbud, so I have no idea what you're talking about.
Oh wow
@@elorrambasdo5233 Why fix what ain't broke lol, unlike his audio mixing (badum-tiss).
@@JeronimoStilton14 been saying this
this mechanism is actually a variation of whipple tree mechanism. Which back in the drawn horse wagon day, was used to distribute the force evenly between horses. Since not all the horse have the same pulling strength. Stronger horse will naturally shift closer to the center of the pivot and weaker horse will move farther. So the net torque balance out and the horse wagon won't start to tilt and can go straight even when you have multiple horse with different pull strength.
@keenheat3335 Well how about that! I had never heard of these before, and this is an awesome extra bit of mechanism history. Thanks for sharing this!
You answered a question I've had since the mid 80s.
@@bubsbuilds in modern day, you can find this mechanism used in windshield wiper, telescope support, multi edge pizza cutter, etc. Basically anytime you either need to distribute a force evenly across a multiple points or need to concentrate multiple force into a single point. This mechanism can be use. So you technically retrofit multiple windshield wipers into a fractal vise. Since the mechanism origin is the same
Tractors still use them
I'll have to check that out.
Flexure design information is grossly underrepresented on UA-cam. Good work
@josephr5804 Thanks! If you haven't come across it before, this channel is one that has some great flexure builds, www.youtube.com/@TheFACTsofMechanicalDesign . Hope ta catch ya on the next live stream! Cheers
@@bubsbuilds will check it out! I unfortunately can't make your streams when I work ot into the early morning
@josephr5804 Hopefully your work schedule has been going better than my streaming schedule :)
I wish my maths teacher had brought these into the first lecture we had about fourier series. It still amazes me that you can reproduce any curve by adding together a bunch of cos or sine waves. the vice basically does the same thing - the target "curve" is the side of the object you want to clamp, and your frequencies are each size of fractal. Seeing how the vice works would have done wonders for my belief in my maths lecturer. anyhow, 30 years too late, now I know! thanks
This was a fun video, and I get the love of the vise, and the limitations!
Your skill and understanding have been very beneficial to seeing the same goal, but through different mechanisms!
I am stoked to see how this adventure goes!
Try the first one in a mix of tpu and play where only the joints are tpu. I'm thinking you can print it in tpu and snap a pla exo skeleton on the parts that shouldn't flex.
@freedomcaller I definitely think this could be a workable option. Might be tricky to keep the joints from adding up to a fair bit of play in the assembly, but maybe some tapered dovetail connections or the like could keep them snug. May indeed have to play around with this a bit, thanks for the suggestion!
@@bubsbuilds a simple dovetail and CA glue them together.
@kevingallineauii9353 For some reason, that didn't even cross my mind! Very true, that should work just fine. That CA joint will likely be the strongest part of the linkage.
Saw one video a bit ago about an old vise that uses a row of linearly moving square pins with a pocket of small ball bearings at the back to equalize the load (so like a hydraulic oil would, sans all the sealing issues). Seems like it might be easier to fabricate.
@maximthemagnificent I've seen a couple of those as well! (this is one of the videos I've seen on that type of design: ua-cam.com/video/JaHjFL7NZlU/v-deo.html ) And very fair point, that may indeed be an alternative for me to try out, thanks for reminding be about those gems!
One day, if I ever get good at machining, I'd like to build a metal fractal vise. They are legitimately one of the coolest tools ever. However, a 3D printed one has a certain charm to it.
For the first design, you could try using a finer nozzle to reduce the web thickness. I use a 0.25mm nozzle for detail work, which if you're intent on keeping the double wall would get you to about 0.4mm web thickness. Or you could go with a single wall for a 0.2-0.25mm web.
You could also go with a multi-part construction, using a TPU web slotted into the PLA bars.
Production and videography quality is top-notch !!!
aside from, yknow, the audio on the entire video
Love the Taylor series comparison .
Flexures can also do non-local rotation like the dove tails. If you have two parallel blade flexures connected from a fixed base to a moving element, then the rotation origin is at the intersection of their extensions. If the blades are parallel they are said to intersect at infinity and thus rotate around infinity. A rotation with an infinite arc radius is a translation.
PETG and TPU bond very well together and become almost as strong as ABS
Outside of the panned audio, this is really cool.
There's something weird about having audio only in 1 ear, it kinda feels like my ear is being tickled 😅
The blue vise is so satifying to watch!
@paulroberto2286 glad I'm not the only one that gets satisfaction from the motion on that one!
And sorry for the non-consensual tickle 😁definitely not intentional, but not gonna lie, your comment made me feel less bad about it cause that's kinda funny :)
:)
Good thing I have an audio mixer on a speed dial. Just wired the left channel into both left and right output and the audio was fine 👍
I just unplugged my headphones half way lol
Nice video!! I love seeing the journey
I'll be real, my fractal vice is just foam. It's more stable than a 3D printed fractal device, easier to work with, but it's also cheaper. Not all foam works perfectly sure, but there's enough good options not to care too much. Maybe I should consider making it compliant in only one dimension, but that ruins the simplicity of my genius design.
You could probably make a fairly stiff yet compliant flexure with properly cured tough resin printed models. Resin printing could also allow for way more hierarchy levels and if you really want to go the extra step you could print the model in wax resin and vacuum cast it in metal
This is brilliant. Thanks for sharing!
It's just a matter of time until the 3D version of fractal vise comes out
Excellent Work
So i think the main reason for the pivot to be infront is to make sure its self aligning.
With it further back, it can potentially move in the opposite direction and jam well interfering with the other parts
Compliant fractal. Great for hobbies.
My left ear loved this
@killpidone Oh wow...my bad!! I knew I was forgetting/overlooking something! I'll reupload with stereo, thanks for the heads up!!
@@bubsbuilds worst comes to worst set your audio to mono, atm your problem is you've only recorded one audio track but it's in stereo therefore only one ear has audio. You can also duplicate said track to the right channel, but you haven't really got stereo audio going on so just switch to mono.
@@bubsbuilds XDDDD i was so confused
Ah this is so cool to see. Thank you for taking us along on your journey! I mulled over a flexural fractal vise when videos of old mechanical versions hit the internet a few years ago, it's really neat to see your progress on this. Learning that you can pull the pivot back from the nominal vise face is an important nugget!
One thought is to use crossed beam flexures, where two leaf flexures overlap at 90 degrees at their midpoint. I've found that configuration to be superior to both notch and simple leaf flexures if you're trying for a pivot; better range of motion than the former, better off-axis rigidity than the latter. Printing them monolithically requires a bit of support material but if you leave a gap between leaves it comes out easily enough.
Another thought on printed flexures: I've found PETG to be a good compromise, it's not as floppy as TPU but holds up better than PLA.
An interesting (if slightly concerning) effect I've seen in many of my printed flexure projects, particularly those with large angular displacements, is audible hysteresis. If you flex the leaf one direction and listen carefully, you may hear a very faint hiss; do it slowly enough and you may hear tiny pips and pops, perhaps from thousands of tiny stick-slip interfaces sliding past each other. I think it's from adjacent layer lines moving slightly relative to one another. What is interesting is that if you bend the joint again in the same direction you won't hear the noise; you have to "reset" it in the opposite direction, at which point yoi can hear it again.
Interesting, but also concerning! At high speeds, will this rubbing be a source of heat which degrades the flexure? Does this point towards an impractically short fatigue life? Are the flexures changing enough between strokes that they lack the repeatability the flexure-obsessed among us love so much? Anyhow, let me know if you ever notice a similar phenomenon.
If you're using the material itself as a spring for holding power, you need to make the pivots slightly stiffer in each layer as you move from the grabbers to the base.
@billkissick6268 Great point, and thanks for bringing that up! I forgot to mention it in the video, but that is indeed true!
Very neat investigation and idea to open up more flexible workholding for those not made of money or already a capable machinist with workshop. I'd like to see some grip strength and deflection tests on these designs though as I suspect as they stand they are going to be difficult to use. Maybe even all but useless for anything but hand work - as any powered tool you'll lose the feel for how much the vice and object has deflected if the deflection is as bad as it seems. However if you just slightly bias the sides to push down against the vice rails so the object to be gripped is then pushed against it I suspect it would be more effective - in effect you have a few points of 'fixed' contact the part is being pushed against by the compliant mechanisms. This probably can be as simple as just mounting them with a bit of angle, but I suspect it would be more effective to add another deliberate flexure element so as pressure is applied they want to always rotate towards the vice body or in this case rails.
Wow, you came up with 2 _great_ alternatives!
I feel like your final could be print in place, if some amount of backlash/ slop of each fractal jaw is allowed.
Flexures are so underutilized, very nice designs! I wonder if you could get a thinner flexure by printing the notch flexure web in the plane of the print bed. Might lose some strength but you could scale the thickness with layer height instead of wall thickness then and maybe get some thinner webs
This is really cool!
I’d like to adapt a TPU version specifically to clamp violin plates in place on a bench for carving.. I’m sure other instrument work holding vise and vise-adjacent workholding can be made!
Use a smaller print nozzle for those notch flexures.
@ethan_becker you know I'm far too impatient for that :) But very true, printing with a 0.8 nozzle and then complaining about thick notches may not be ENTIRELY reasonable, haha.
i often only use one side of my headhpones so this video was easy to listen to
Nice project, nice video, thanks for sharing.
Cool👍 maybe try connecting each flexor unit to its neighbour to reduce the sideways movement. That energy would be transferred forward to the teeth instead of sideways, which would give strong grip. It’d also force the teeth flexors to flex more, providing greater local holding force.
@dingodog5677 That's an interesting one, I'll have to think that over a bit! I'm guessing there'd be a way to do that without over constraining them, probably just with adding another pivot at each of those new connections, but may also would need some translation freedom to allow the teeth to rotate freely. Interesting indeed! Thanks for the suggestion and food for thought!
@@bubsbuilds can you use something like a rubber band that just puts some tension between them. Might have to try a few different types to get the right set up.
I really wanna see a version that's using many more iterations to much more finely fit any shape.
I'd also like to see a "3D" version that can fit shapes in *two* dimensions.
For the flexure version, is it possible to increase the range of motion by "stacking" leaves in alternating layers so they can "move through" each other? Kinda like shuffling cards by pushing half a deck into the gaps between cards in the other deck
Absolutely awesome project and highly interested in the TPU version - for delicate wood pieces. I'm seeing the TPU version's lateral flex being reduced/eliminated by being sandwiched between 2 horizontally mounted rigid plates (contain the flex).
@josephpk4878 Love these ideas for use of the TPU version that are way outside of anything I'd considered! If you decide to give the sandwiched version a try, I'd be super curious to hear how it comes out! This version is flat on both sides, so it may be a good candidate: www.printables.com/model/690825-flexure-fractal-vise-jaws
the generic term for these types of nested pivot designs is called a "whippletree"
Replace the pins with print in place pins, then you have to break them free at first, but then you have a singe print with no assembly
I remember a time when you could set mono or stereo and the one time I actually wanted to swap it to mono there's no option.
Great video though, no worries on the sound errors
Right??? :) And thanks!
I wonder if it wolud be worthwhile making the outer leaves of the flexure version a bit stiffer than the inner leaves, to counteract the tendency of the vise to splay outward? Or if it was shaped with a concave curve on the face rather than being flat?
Let's focus on the subject, and leave the right side audio alone.😀 You did a fantastic job.
Awesome video.
For the TPU fractal pieces could you make all but the last out of something stiffer and then leave then do the contact pieces out of TPU. In the last design you showed could you pin in TPU pieces?
I wonder how it compares to two rubber cushions with gradually increasing infill deeper in the pillow. Get what I mean? :)
What software do you use for your simulations?
I would honestly just throw the video into the video editor again and re upload tbh, you're a small channel i think you'll be fine
@maxwell_edison Very fair point, and true, but to be honest the response has been pretty good despite my audio ignorance, and I can't bring myself to discard the comments and such (wouldn't have known without them that this mechanism is called a "whippletree", and I just love that). So for now I'm ok with letting my poor editing skills shine :) But I do appreciate the suggestion, and I'll definitely mull it over, thanks!
Have you considered printing it upwards and swapping material on the final smallest fractals with TPU? It might work better having the stiffness of PLA with the TPU for holding
Oh this video is a month old. I wish more creators would respond in older videos D:
@Raye938 Does it count if I'm just chronically late on replying to things? :)
To your question, I do think something with swapping out for TPU on the small elements may work well, but my main concern with going that route would be that the stress in the flexures would then be going directly along the print lines and may break...but admittedly, I don't have anything to back that up other than a hunch :) An alternative suggestion I saw from someone that may accomplish a similar thing would be to make the flexure pieces separate altogether and glue them in with some dovetail joints or the like, which I think would probably work pretty well for mixing and matching materials (and could also allow you to have the 'teeth' be TPU also). But in general, I do like the idea of being able to have the last layer made of TPU while keeping the rest PETG (my preferred material for this sort of stuff, just so I don't have PLA splinters flying everywhere when I inevitably push it too far).
If you decide to give it a try, I'd love to hear how it goes!
@@bubsbuilds That helps a ton! Lmao. That's a brilliant idea, I'm curious how that would turn out. Thanks for replying!
that blue filament you used looked familiar... is that HT-PET+ ?
set audio to mono before exporting, fixes all your issues sweet pea
This is awesome, have you tried making a print in place mechanical version? I'll try to cad something up
@rosserobertolli I haven't, and if you do, I'd love to see it! That was actually what I sat down originally to sketch out when I ended up going down the flexure path instead. I definitely think that'd be cool!
A mediocre suggestion: for the initial design you mentioned not wanting to thinner than 2 wall thickness. I'm assuming you used a 0.4mm nozzle? Could you not get thinner with a 0.2mm nozzle?
@Shayeta Actually I typically print with either a 0.6 or 0.8 nozzle I'm quite impatient and not typically too concerned with fine details :). But I absolutely could get thinner in the notches if I swapped down to something like a 0.2. But I would start to worry about over-stressing the material if pushing the web thickness too thin. Metal flexures with webs that thin can handle a fair bit of load still, but I suspect printed hinges that thin would deform pretty easily. One of these days I'll have to dust off the smaller nozzles and give it a go.
why not just 2 stiff rubber bladders with reinforcement ribs only allowing it to compress and flex in the compressive direction and not bulge out or aside? the more the bladder is compressed in one point, the higher the total pressure, and grip on the contact area. but its also compliant.
@BartJBols I think that absolutely could work! I've seen some adaptive vises that use a sort of similar, but different concept. This video by "Make Everything" has a great example of one ua-cam.com/video/JaHjFL7NZlU/v-deo.html . But your concept may be an easier one to build, definitely an interesting idea!
This is actually closer to a hardware version of the Fourier series, not a Taylor series.
I think you might have just inventer the windscreen wiper ! 🙂
But isn't the point of those to hold the piece enough for the forces of machining?
Try using a spring in the joint
nice job
Great video! What did you use for the sims?
@ddlow6455 Thanks! All of the sims were done in Fusion360's Simulation Add-on
Wonder how a blend could work
I'm surprised I didn't see a PIP design on this. Guess that's the next step...
@RandomAccountHolder That's actually what I set out to make when I got distracted by the idea for the flexure-based design. For it to really count as PIP, I guess I'd need to not be lazy and actually include the 'vise' components too, eh? :)
Without a MMU or multi material setup you should be able to print some blades with PETG or some other less compliant plastic. You could then tune the deflection of the fractal vise to the application by swapping out blades. You wouldn't need it in all the flexures just the larger supporting ones. You could think of it as adding bones to mass of muscles or that last constraint to fusion so it stops complaining that it's not fully constrained.
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You would want the reinforcing blades in the double line areas and avoiding any of the corners. UA-cam doesn't use a uniform font or I'd do better ascii art ya that's my excuse at least it's not ai art though.
Left ear: Adventures in work-holding: Exploring some alternative Fractal Vise design concepts
Right ear:
Pretty neato
idk if someone else said it, but your audio is only coming out of my left headphone, idk why
what are you using for simulation?
@ZetaBling I used Fusion360's simulation extension for these.
you made me think my headphones broke
did you know you can print 0.2mm walls with a 0.4mm nozzle printer?
Great...now do three axes :D
neat
Can this thing like... Actually HOLD anything tho? There's no point to a vice if it doesn't actually clamp down stuff hard..
why is there only left audio...
I don’t think the designs are the only thing tweaked lol
my man fix your audio for headphones. Audio is coming out only from left ear :) nice video tho
Right ear missing out
so quiet cant be turned up enough to be loud lol
great video just quiet
@EMoney513 Sorry for the unexpected hearing test, but glad ya enjoyed it despite that! :)
proud 2,3%er
@KnooBill glad to put a name to a member of my peer group! :)
Was interested, but the Ai generated images are really annoying
I wish SOMEBODY on UA-cam world go into detail on flexure design. Everyone I've found either just shills for a product or a university course, or flakes out after showing a couple of hinges or just one design, or is just demonstrating a selection of existing designs found on thingiverse without explaining anything.
@claws61821 Have you seen this lecture series: ua-cam.com/video/j1lT1RtKnms/v-deo.html&pp=iAQB . That channel has quite a bit of great content on flexure design and concepts. Also, I'll definitely keep the comment in mind next time I'm making a video on a project that includes flexures and try to dive a little deeper on the details of the flexure design!
@@bubsbuilds I think I had forgotten about that one after meaning to watch it some time back. I have watched some of his other videos and found them somewhat hit or miss for my low level of relevant knowledge
copy past audio to new track bam fake stereo
your videos dont need AI pictures in them, please stop using them
God the ai shit is annoying
Ai images are distracting and unnecessary in this video. Not to mention all the other arguments against them. Really good video otherwise :)
Which hich software do you use