@stratos2
What is this, a scientific testing approach for an actuator, a solid testing phase, a good explanation of physics, and freely available files? You have earned yourself an instant subscriber, that was top notch!
@Zothaqqua
As a sailor, I saw you messing with bent steel wire and paracord and was like "noooo!" but then you found what I believe is the right answer, and I was "yesss!", not because I agree, but because it says a lot about your process, and that I will learn from your other work. Subbed, and cheers!
@toocleanpappas5397
Just a tip from a hiker who has been using Dyneema for years. If you want your rope to last longer, don't let the rope contact itself. In the video it looked to be touching where it was wrapped around. Dyneema is very strong, but if it is rubbing against itself it will get damaged. I learned this from putting a Dyneema tent into a Dyneema stuff sack. Cool video! Also, the Your Mama joke took me by surprise and cracked me up. :)
@BernardSandler
The drive is brilliant. Your capacities as a designer and engineer are obviously evolving, but most impressive is your capacity to explain things clearly.
@stopthephilosophicalzombie9017
You are going to give Stuff Made Here a run for his money in no time. I like how you share the math instead of completely glossing over it. Amazing work.
@robotskirts
I love the cool confidence of it drawing shapes wrong.
@mohamedbelafdal6362
I am an Electrical Engineer and seeing a simple exponential, explains things so well, despite knowing nothing of mechanics. keep up the good content
@vink6163
That's really interesting. Years ago I took apart an old hard drive from the 1980s and it used what I have now learned is a capstan drive to move the head across the platter, back when they used stepper motors instead of magnetic voice coils. Thanks to this video I also learned why they used a thin metal band (where the rope is used here) and that they probably chose the capstan drive due to the minimal backlash. Thanks for explaining everything so well in this video!
@blueasis
I appreciate the willingness to test until it breaks and showing that purposefully. Many creators often depict breakage as accidental and not necessary to the process.
@TroyRubert
How am I just now finding this channel? This is gold.
@alexandrpetrov1110
scientific testing approach for an actuator, a solid testing phase, a good explanation of physics, and freely available files? You have earned yourself an instant subscriber, that was top notch!
@dpear3
Dyneema is a crazy material to work with. It’s absurdly strong, absurdly low stretch, absurdly light weight, and freakishly low friction. Not sure if you ran into any issues with its low friction, but it can be weird in how different to other ropes it is, because in some situations well known knots don’t behave as expected because of its lack of friction, something to keep an eye out for if you use it more. Also it doesn’t like fusing to itself when you melt it, annoying for trying to keep the ends from fraying. Super glue works though if you ever need that knowledge.
@arjovenzia
If anyone is interested, Dyneema is a popular performance upgrade in the yachting community. by replacing the steel wire mast stays with something lighter, you reduce the weight at the top of the mast. as you want the thing to stay upright, you make the bottom bit (the boat) heavy, and due to the massive lever of the mast, even a small weight reduction up top can improve stability. If you want a small bit to experiment with and dont want a whole roll or to wait for shipping, you may be able to get either offcuts or by the meter from your local marine supply store (chandlery). very cool vid, subbed.
@hassankarim7084
00:00 Introduction & Motivation to rope driven actuators 00:33 Capstan Drive 12:17 5R Linkage Parallel Robot. 17:13 Quadrupedal robot leg 19:02 Closing remarks
@thepagan5432
I found this very interesting. I am a retired gearbox engineer, consultant, repairer, etc. We designed and built capstans for high-end yachts. These were hypercycloidal gearboxes. They were manufactured to a high degree of accuracy and we achieved minimum backlash, of around 0.002" maximum. Have you determined the maximum loading that rope can withstand ? Probably the most accurate gearbox we made was for satellite tracking, where the backlash was basically 0 ( reality check it was around 0.0005" ). Everything in the gearbox was precision ground and was hand built. For some of the smaller satellite dishes I could see a rope driven gearbox system would be advantageous, as long as the 'stretch' factor was addressed. I hope you do more on the rope gearbox as I personally find it very informative. That's life when you've been an engineer all your life, your mind cannot retire. Thank you.
@makex_se
The leg looked so life like, and i love when things are tested to their limit. You have impressive skills, nice work!
@eduard_soul
Timestamps (Powered by Merlin AI) 00:02 - Rope-driven reducers are the future of robotics. 02:15 - Friction and Capstan Equation prevent rope slip on smaller drum. 04:24 - Creating a high precision actuator using a brushless motor and controller 06:45 - Achieving high precision speed reduction using rope requires careful consideration of drum diameters and D2D ratio 08:56 - Finding non-creeping ropes for precision actuators 11:18 - Building a 5r parallel robot with precise and fast movements 13:26 - Interpolation is essential in moving an effector from point A to point B accurately. 17:08 - Building and testing a quadrupedal robot leg for high precision speed reducer using a rope 19:28 - High precision speed reducer using rope is suitable for future projects.
@0xABADCAFE
I have utmost respect and admiration for an engineer confident enough in his skills and knowledge that he chooses to film himself working while still in his pyjama bottoms. Great video. Subbed!
@HighFlights
I measured the cad files from GitHub and the ratio is between the radius - the gap between the drums (68-0.625)/(8.5-0.625) = 8.55
@industrialcoder