Відео

@@j.rumbleseed how do you mean?

@@IainMcClatchie there is a link there for the fusion file & models. Check it out when you have time! Also make sure you use grease because GEEZ there are a lot of gears!

@@IainMcClatchie you could drive all the gears together with an internal gear around them, but it severely limited the numbers of teeth that work out, math wise… solving for internal meshed with n planets, meshed with a big ‘sun’. Plus the gears all had to be on there in the correct order so.. it was easier to stick them in a carrier

@@IainMcClatchie I used a spur gear generator add on in fision360; it seems ok, could certainly be better

@@davoriffic I looked at my old notes, and it looks like I'd settled on an inside-out version of what you have here, but driven from the sun gear. No wonder I like your design so much. I wanted the output torque to be between a central ring gear and two outer ring gears, because that maximized torque capacity. It looks like I got hung up on the bearings for the planet gears -- your pin and rivet solution seems good for this size. Now you've got me thinking maybe I could do that and get the gearbox size down to something reasonable. How lossy was this thing? 3d printed gearboxes often lose more energy in the gearbox than they deliver to the output, vs >95% efficiency for metal gearboxes. Do you know where your losses are? I'll note that you didn't actually test the gearbox to failure, you just know that it's stronger than your NEMA 17 motor can drive. That's pretty darn good, and I think it's because your planets are short and symmetrically loaded, and you have a lot of them.

@@IainMcClatchie I don't really know how efficient it is, though this style of epicyclic gearing is known to be somewhat inefficient. I was considering doing some destructive testing, but didnt want to ruin it it was so pretty! Also, it really would take a lot to make it skip or to shear off that many teeth at once.

@@IainMcClatchie yes; I’d considered making the rotor a big rubber o-ring so it has the ability to compress. I also experimented with rubber balls, but the particular kinds I found ( airsoft projectiles) are actually very slippery / lubricated.

@@IainMcClatchie I like your idea about just having 2 rigid rings

@@davoriffic came here to say the same thing as @IainMcClatchie, but in trying to type up my comment I think I realized that this does not actually work. A ball touching only three points allows any one of the rings to move, while both of the other rings remain fixed. At any instant the ball is equivalent to a triangle with the three corners touching the three rings: a triangle can't be a lever to move an object out of the plane it's in, unless the three points are in a line and it's not a triangle anymore. So the system actually strictly demands four contact points. In the setup we are seeing here, the top and bottom contact point form the "fulcrum" that defines the lever whose ratio sets the input and output. Now, I think it's still quite possible to have a kinematic system here that's not overdefined. We just need to spring-load two of the contact points. Two must be rigidly fixed, which would define the position of the ball (two non-parallel tangent lines define the position of a circle), and the other two can meet it where it is. I think in this design the absolute simplest thing we could do would be to replace the top or bottom stator ring with a flexure. Would still be hard to get right, since that flexure needs to have a certain stiffness with respect to the other outer flexures. It might be better to change the angles of some of the contact planes to try and make it easier to design.

@@InductorManyes; I was picturing the same thing late in the night; with 3 points of contact, the balls just tip their axis of rotation so there won’t be any ‘gearing’ happening. It could still work if the balls had axles that were held all parallel by a carrier…

@@VEC7ORlt haha! Yeah.. in my case it is usually just short hand for ‘personal rediscovery of something already in use since the 1880’s’

@@Rudmin so cool

@@DGronki oh? Share link? Sounds cool thanks for comment

I think he’s referring to the Nuvinci drive which you can still find on some bicycles. The same CVT ball bearing transmission idea was also used in Colchester Chipmaster lathes. They were not very reliable however.

That lathe transmission was called a Kopp Variator.

I actually think the plastic version would work well too. I designed it as a way to make extremely robust plastic gearing, where you have lots of teeth taking the load. Extremely hard to strip out or make skip.

@@davoriffic Yes. But I am thinking of some redundancy over kill, when under some heavy load, or used over time. When being used for a long time, the plastic parts are more likely to melt, long before any metal parts would. Is ok to use plastic to test with. And I feel is a good way to find out if something is made truly strong. If something made of plastic does not brake easy. But for anything to be used long term, for with any possible final project that is intended to be used, I personally would want to use metal parts. I have seen in the past, too many toys, and 3D printed projects with plastic parts, such as gears, melt, to trust it in something like this. Is just how I see it.

@@Gopinath2119 you are correct, the module of the gears on or touching the rotor are different from those on or touching the stator. The modules were chosen so that the axis of rotation of the small planet gears exactly lines up.. that way they can be stacked and connected as compound planets.

@davoriffic Thanks for clarifying...

@@ChristianGarrelts please take a video when you get it up and running

@@leogray1091 oh it’s less mysterious than you think; the side with the one less tooth has teeth that are slightly bigger to make up the size difference🤓 in gears, the ‘module’ is a number for the gear tooth size, the the module for all the gears that touch on one side is different from all the gears on the other

You can download stuff about this project from here: drive.google.com/drive/folders/1Vd8Iz-t7SfQN67haENu9mSlcC7crgHqZ?usp=drive_link It looks like i do NOT actually have a spreadsheet for the math of the gearbox, however. Thanks! I'll have to do that...-david

Thank you. Let me know if you have ideas for any things you'd like to see covered in future videos!

Yes; i thought of that after making the video. I think that the state numbers probably should be indexed starting at 0 instead of 1, but i didnt want to confuse the issue, presenting for a general audience.

@@davorifficFor my own amusement, I am writing an emulation of your card Turing Machine. I set the maximum number of states to be 7, the state indexing starting at zero instead of 1, and reserve '8' to mean HALT. I won't publish this code anywhere without your permission, and I will be happy to send you a copy of the source.

@@WilliamLeue Feel free to publish the emulation! Would you like clean images of the card front and backs? Also, please share here when it's running; id love to see.

@@davoriffic I am drawing the cards, etc programmatically, so I don't need a page image better than the one on UA-cam, but thanks! And thanks for the permission to publish. I write this program for the Color Maximite 2, a high-performance retro-computer based on an ARM Cortex 7 CPU, 8 Mbyte of RAM, screen resolution up to 1920x1024. It runs an advanced version of BASIC at 270,000 lines per second (interpreted). This BASIC dialect, MMBASIC, has modern control structures (no line numbers), subroutines and functions with private namespaces, good graphics and math libraries. It would be very easy to translate to Java or Python, etc. When I get it working I will put the source code on my Github repo.

@@WilliamLeue can you translate it into something that will run in a web browser? Would that be JavaScript or something?

I suppose it depends on what kind?

@@davoriffic p=np.

@@magnuswootton6181 I think the quantum-computing version of this game would involve cards that look like this: images.app.goo.gl/eFM5SZWboYDpdSXS9

I was considering having a mat to lay the cards out on, but the individual programs vary so wildly it didnt make sense. I think I'll lead with a good set of examples in the game instructions, though. It breaks down and is really pretty simple. Considering making a 'graphics expansion' though that has black/white tiles you can flip over. That way you could map values to it from a 'register' in the tape ;-D

In theory, yes. With enough cards and time?! I feel like it would be an awesome exercise in absurdism to calculate how MANY cards, and what the effective frame rate of Doom would be, using my card game…

I’m considering making a ‘graphics driver expansion pack’ that would probably just be a bunch of cards that are black on one side and white on the other 😁

Cool! Can you share? It’s actually really easy to translate Turing machine notation into the card game, and back. limitations include: only up to 8 states, up to 8 instructions per state, and data alphabet of 8 symbols… also less than an infinite number of cards 🤓

True; with these you have both sides too. It gives you 8 possible different symbols, or 3-bits binary :-) “this card game is a 3-bit computer” was too weird sounding for the title 🤔

Thanks! Maybe I should do like a crowdfund to promote a book / deck of cards combo?

100%

Exactly! Need more ram? Use more cards; Turings’ theoretical machine had an infinite tape…

I’m considering selling it as a deck of cards with a little rule book. Maybe something a class in computer science would want🤓

can i ship you some cards? Maybe you can write it!

@@davoriffic Sadly, I am not a roboticist. :<

@@mendelovitch well I’m not a computer scientist.. don’t let it stop you 🤓

What kinds of ratios and speeds do you need? These split gear designs are good for high gear ratio, but do have some 'bumpiness' in their operation. It is difficult to make them run smoothly; helical gears like you said are good for smooth and quiet rotation. Maybe you need a more classical type planetary gearbox?

@@michaelretzer8480 cool; I see. Do you want it to be 3D printed?

Yes, like a lot of planetary gear boxes it lets you achieve a high ratio; harmonic drives are awesome because of their low part count, but hard to do with just printed plastic. The gearbox in this video is really trying to show how to make hard-to-shear gear boxes out of plastic. It puts mechanical strength where it is needed to let you use a comparatively weak material, and still be reasonably compact. You DO have to use grease ;-D

Crazy, right? It makes me wonder if, in an upcoming age of quantum-computers and super-smartly-guessing AI, we might have to revert more of our day-to-day online security to this method.

am i to understand that you are commenting on behalf of the algorithm?!? ;-D

I used ABS and silicone grease

@@davoriffic Thanks for the info. I am going to start printing parts tonight for one, will let you know how it goes