BubsBuilds

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@wfpnknw32 3 күн бұрын

amazing! very creative, also i didn't know about opto-interrupter. very cool. Although you could just attach a camera to an analogue dial indicator and then get chatgpt to write a python script to extract the dial position. Still I like this approach.

@zakqwy 5 күн бұрын

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.

@zakqwy 5 күн бұрын

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.

@Polkem1 6 күн бұрын

Production and videography quality is top-notch !!!

@stefanguiton 6 күн бұрын

Excellent Work

@lightandcolour 6 күн бұрын

Let's focus on the subject, and leave the right side audio alone.😀 You did a fantastic job.

@mikemorrell7921 7 күн бұрын

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?

@amoose136 7 күн бұрын

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.

@keenheat3335 7 күн бұрын

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 7 күн бұрын

@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!

@SlinkyD 3 күн бұрын

You answered a question I've had since the mid 80s.

@keenheat3335 3 күн бұрын

@@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

@bubsbuilds 7 күн бұрын

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!

@Infrared73 7 күн бұрын

Ahh, that would by why I don't hear anything. Right speakers on laptop don't work.

@mikemorrell7921 7 күн бұрын

And I just thought you were recording your voice one room to the right for a cool 3D effect :)

@EnlightenedSavage 8 күн бұрын

Love the Taylor series comparison .

@josephr5804 8 күн бұрын

Flexure design information is grossly underrepresented on KZbin. Good work

@bubsbuilds 7 күн бұрын

@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

@josephr5804 7 күн бұрын

@@bubsbuilds will check it out! I unfortunately can't make your streams when I work ot into the early morning

@FUZE_313 8 күн бұрын

my man fix your audio for headphones. Audio is coming out only from left ear :) nice video tho

@FilterYT 8 күн бұрын

Nice project, nice video, thanks for sharing.

@strolantic2930 9 күн бұрын

nice job

@freedomcaller 9 күн бұрын

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.

@bubsbuilds 7 күн бұрын

@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!

@JeronimoStilton14 9 күн бұрын

my left ear really liked this video.

@elorrambasdo5233 8 күн бұрын

I love this joke, especially considering how it just hasn't changed the entire time KZbin has existed.

@freescape08 8 күн бұрын

I just happen to be only wearing my left earbud, so I have no idea what you're talking about.

@samgrainger1554 8 күн бұрын

Oh wow

@JeronimoStilton14 8 күн бұрын

@@elorrambasdo5233 Why fix what ain't broke lol, unlike his audio mixing (badum-tiss).

@elorrambasdo5233 8 күн бұрын

@@JeronimoStilton14 been saying this

@ethan_becker 9 күн бұрын

Use a smaller print nozzle for those notch flexures.

@bubsbuilds 7 күн бұрын

@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.

@paulroberto2286 9 күн бұрын

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!

@bubsbuilds 7 күн бұрын

@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 :)

@paulroberto2286 7 күн бұрын

@KnooBill 9 күн бұрын

proud 2,3%er

@bubsbuilds 7 күн бұрын

@KnooBill glad to put a name to a member of my peer group! :)

@maximthemagnificent 9 күн бұрын

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.

@bubsbuilds 9 күн бұрын

@maximthemagnificent I've seen a couple of those as well! (this is one of the videos I've seen on that type of design: kzbin.info/www/bejne/gJKrm3mCbLONorc ) And very fair point, that may indeed be an alternative for me to try out, thanks for reminding be about those gems!

@killpidone 9 күн бұрын

My left ear loved this

@bubsbuilds 9 күн бұрын

@killpidone Oh wow...my bad!! I knew I was forgetting/overlooking something! I'll reupload with stereo, thanks for the heads up!!

@patrickhector 8 күн бұрын

@@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.

@glowytheglowbug 7 күн бұрын

@@bubsbuilds XDDDD i was so confused

@ddlow6455 9 күн бұрын

Great video! What did you use for the sims?

@bubsbuilds 9 күн бұрын

@ddlow6455 Thanks! All of the sims were done in Fusion360's Simulation Add-on

@mulberryworkshop 17 күн бұрын

Concrete vibration motor

@Kosh42EFG 17 күн бұрын

Why have I never seen your channel before? It's awesome.

@MattLitkeRacing 19 күн бұрын

What about an up and down motion instead of the front to back? A camshaft could move up then drop everything down

@amartinjoe 19 күн бұрын

OMG that is insane. You have a lot of patience doing this. I salute you!

@amoose136 19 күн бұрын

As a fellow maker of custom screw sorting machines I can say that: 1.) A series of fixed width sieves is a practical way of sorting by diameter without getting too crazy on assembly complexity. 2.) Slots work better than holes but the longer the slot the easier it is to flex and not have a fixed width. Beam deflections scales with L^3 so don't get too long. Stiffness of the beam scales with W^3 as well though so increasing the gap (W) between adjacent slots can help a lot as well. 3.) Massage vibrators are cheap and you can get them at walmart although might not have enough power for the combined mass of the hardware you're trying to get shaking. 4.) If you're going to be at ERRF/3d Printopia, I have an optical + electronic based method to demo this year that accounts for sorting by length and head type.

@YO-ur5yl 20 күн бұрын

I would add a new unit to lift and fall the whole unit by motor and cam at bottom, that way no need to reprint the rest.

@overPowerPenguin 20 күн бұрын

Use a woofer for vibration.

@Mr-J... 21 күн бұрын

The shaking doesn't get the bolts to separate. You need vibration to get them to jump up. Plus you overloaded it. The feed rate needs to allow for initial sorting, otherwise it will just bridge.

@MrMonkeyMan89 21 күн бұрын

A similar principle to a semi manual pharmaceutical capsule filler jig might work. It has a self orientation sliding layer to drop the capsules into the holes below in the correct orientation.

@gregspecht3706 21 күн бұрын

I think you need more a shaking up and down motion so you pop screws out of holes that the thread fits but head doesnt and so you realign so they can rotate up and down. I would do a circle that grows like a spiral then has a sharp drop and it gets pucked up by springs.

@mitchellharmer9732 21 күн бұрын

Similar to the rotating drum idea but trying to keep as low profile as possible you could consider moving to as close as a ‘folding’ or ‘tipping’ motion as practicable, where rather than a single screen have two screens of the same sift category ‘tipping’ its load into the other. I’d imagine the degree you would need to tip would come down to how much you’ve got in there. Unfortunately the more bolts there are the more you have to try and displace each to get them to fall through.

@BasdeBruijn 21 күн бұрын

We gave our students the similar problemen. What we saw worked pretty good was using vibration (as otters said) . The teams created that with a motor with an excentric ring, running somewhere around 1000 rpm. This Will create a lot of sound though. With plastic the noise should be less.

@YonatanAvhar 21 күн бұрын

I think that a large part of what makes the smaller version work well is the motion on the Z axis, causing the bolts inside to be flung up and down. Another change I'd make it to fit more holes in each layer, by placing them in a hexagonal grid instead of a rectangular one. Although I think the idea to change them into long slots that @airman2468 mentioned is better Edit: another idea that came to mind for how to create the Z motion: solenoids! Place 3+ of them below the device, and let them shake the whole thing violently

@PedPEx 22 күн бұрын

nice design so far, but i guess you have not enough motion in the contruction overall. It could be possible to overcome that with a solution similar to this: kzbin.info/www/bejne/aqXHkIhmbsiGmLM They use it for sorting caps for bottles. Only if the solid side of the cap is near the metal backside of the "escalator", the cap has its center of mass oriented in a way that it does not tip over and would have to try again. You could try to use the design and put your sieve cutouts in the back. But i have to admit, i don't know how you could ensure that nothing get's jammed - eventually by using a big vibration motor like this one kzbin.info/www/bejne/sIDWgmV4ntd_nJo

@Azeazezar 23 күн бұрын

Nut sorter?

@treesareafewofmyfavoritethings 23 күн бұрын

I feel like it's salvageable if you can add some vertical into your agitation. Where can you introduce a cam that could gently lift then drop the trays? Maybe between the trays themselves so the horizontal action forces them up a little then drops them? Not sure if that little motor would cope with all of that though

@Seaofjitsu 23 күн бұрын

I would use rotation and make a tumbling action. Imagine 4 cement mixers or rock tumblers stacked up. Each tumbler is a screen. Don't forget to add a mixing/tumbling blade. Every time I saw your prints I had a chuckle... even the color was bad lol. I make a lot of jank so I appreciated your jank 😊 great channel

@jeft.3785 23 күн бұрын

You should get some tupperware and repurpose it as a multi stack pcb etch shaker.

@jaredphipps3757 23 күн бұрын

Have the screen tower site on springs then use a higher speed motor with an off balance count weight. Similar to how a shaker deck works.

@auden_builds 23 күн бұрын

look into using solenoids for vibrating the modules maybe

@Splarkszter 23 күн бұрын

I saw issues with it instantly. Why not make the screen a bunch of long ovals instead of teeny tiny holes that do absolutely nothing? Also yes. You need a strong and SHARP shaking motion. Pivots don't provide that unless you go too fast.

@DudesExMachina 24 күн бұрын

Hack a vibrating cleaner. HF vibrating parts cleaner.

@RichardThompsonCA 24 күн бұрын

Very cool build! Could the whole thing be set onto a vibrating table? Like the ones used for casting. Attaching it somehow to something like a vibratory parts tumbler could work. I would think anything that vibrates quickly and violently enough would work.

@arbitrary_username 24 күн бұрын

Use a cheap massage gun for vibration. Pretty helpful for bubble release in concrete forming.

@lowrads3653 24 күн бұрын

Reduce the offset for the pin in the slider. This will reduce the torque loading, enabling the motor to run at a higher RPM. This should transmit a higher frequency oscillation to the bolts with a smaller amplitude.

@danallen698 24 күн бұрын

Maybe instead of a back and forth motion, how about a rocking motion? Put a pivot pin in the middle of each drawer and push the forward (or back) up and down. This would require less energy, or force, from the motor to get the screws to move. Replace the holes with slots would also help encourage the screw to rotate easier.

@chaymber_crafts 24 күн бұрын

What if you make a slider/funnel/feeder that feeds the bolts slowly (similar to the coin sorter where it Slides down a rail). This way it wont be clogged. If you angle the siv the small motion could be enough to move the bolts downwards(might clog thought) Thanks for sharing you unfinished project, dont see that often.👊😝

@CPT_IDOL 24 күн бұрын

Paint mixer?

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