I don't need these, but it doesn't stop me from wanting them.

"Sir we've finished the Planetary roller screws, but we're 8 million under budget" "Whelp, if you don't spend it you lose it, give it all to marketing"

The graphic artist is just as brilliant as the object!

KZfaq: It's been a long day, want to unwind by learning about Planetary Roller Screws? Me: I don't know what those are.... KZfaq: they have high axial stiffness Me: say no more...

so, guess what's getting saved to my Powered Exoskeleton playlist

I use them 20 years ago on high precision équipments under high loads, very good results!

I've seen a good number of comments comparing similar systems. Just to clarify a few things on bearings and planetary gears. Ball bearings use spherical spacers (balls) to isolate the internal shaft from the casing. These balls are held in place with a collar to prevent them from moving out of position, usually as a result of side loads. The balls rolling against the internal shaft and outer housing produce very little friction. Most of the resistance and heart generation comes from the collar that surrounds the bearings themselves. Roller bearings are nearly identical in form and function to ball bearings. They use cylindrical rollers instead of balls to isolate the internal shaft from casing. Roller bearings are usually more expensive, but can outperform ball bearings because they are linked together only at the ends instead of being partially encased in a collar. Similar to ball bearings, the rollers produce little friction from rolling compared to the limits holding them together but, unlike ball bearings, you can lengthen a roller without needing to add more sections of rollers. Planetary gears are even more fun. They are much more expensive to produce, but don't necessarily require anything to connect one 'free' gear to the next because they all must rotate with the internal shaft and the casing. Gears under load rolling against each other do create more friction than a ball or cylinder, but they don't require supports with joints under load with pins that slide against each other. There are scenarios where a roller can be more efficient, such as when there is no or little side load, but properly manufactured gears will edge out in terms of friction in most cases. As for transfering load, things get much simpler. A ball bearing can transfer load along a much smaller surface than a gear, and a flat roller (unless angled, but that requires significant sliding motion in addition to rolling) cannot transfer any load. Even giving the ball bearing a Generous 30% effective contact surface per collar housing, you still need to use several of these housings to distribute force along the length of the shaft. If the in line, ball to ball, linear, effective surface contact area along the shaft is also a Generous 30%, you end up with a combined contact area efficiency of 10% compared that which you would get from an equivalently sized, planetary gear system. Ideally, you would be able to make a device 1/9th the size with the planetary roller screws, though imperfections and costs would make smaller systems economically unviable in my opinion. I haven't done the math to give any real approximations, but that smaller size should result in lower inertial resistance to momentary movements, and the higher contact area should allow for higher precision and resistance to backpressure. Planetary gear systems are also excelent force multipliers, so you could design the system such that 10 revolutions of the shaft only result in a single 'step'. You have no idea how badly I want to test a system like this directly against its counterparts. I don't think it will ever replace the more common roller bearings for most tasks where cost is more valuable than space, but I can imagine extremely high precision or high load functions would make these systems worth the increase in price.

From the engineering point of view, it's just beautiful to watch!

The music implies this is what Ethan Hunt would use in his Bridgeport.

Everything seems perfect in CAD animation with bodies that don't care about collisions (see 00:50 rollers teeth and helix passing through the outer ring teeth and helix). I would be much more interested in an actual demonstration of a physical prototype to see if the movement is really as smooth and fast as pretended.

Ok, you've got my attention.

You should talk to Thompson Couplings, a high torque self aligning CV joint manufacturer in Australia.

I don't know why but I would love to see a scaled down version demonstrated on a super-stable 3d printer.

I now have a positive impression of these devices that I was previously unaware of. Maybe This Old Tony can make a set to drive his mill table and head.

We have had gears since Archimedes and now still people find new ways to use them and put them together. It's amazing.

This could have been a alternate MCU dimension where Thanos was crushed by roller screws

That's rather clever. I would imagine that the performance gains relative to conventional mechanisms grows exponentially with size. So long as you have the spare available torque for the beefier mechanism, you could get an absurd output. In fact, with a few adjustments, you could probably rival midrange and up hydraulic presses. Also, it looks absolutely amazing. It would be cool just having a working replica as a display piece.

wow, i'm impressed, never thought of it being used like this.

no idea what these are, but i'll take 4 of 'em

Thank you for video. Counter roller could ensure positioning accuracy within clearance (free local wear correction and analysis) at cost of speed;)

These computerised design videos of engineering products are better than a SC-FI movies. Space 2020 never looked this good. And it's educational to boot..

I love the T2 Judgement Day-esque music... PLANETARY ROLLER SCREWS DUNN DUNN DUNN

Тут смысл в уменьшении передаточного числа. Если гайка за один оборот сдвинется на один виток резьбы, то данная муфта при одном обороте внешнего корпуса сдвинется на столько витков резьбы, насколько число зубьев зубчатого венца корпуса(за который цепляются зубья маленьких шестерёнок) больше числа зубьев на этой маленькой шестерёнке. Если допустим число зубьев корпуса муфты в семь раз больше числа зубьев шестерёнки, то за один оборот корпуса муфты она сдвинется сразу на семь витков резьбы.

Got my attention.... I know at least two machines still running elmor drives, replaced last year and already wrecked due to high cycle times/constant running. Travel distance, speed and load constant.

Bloody Brilliant! Good work on the graphics too!

I’m upgrading all my screws to these.

WHAT A BEAUTIFUL MOMENT... And I'm here - you come in too

Can't wait to see them hold planets in orbit.

أَوَلَيْسَ ٱلَّذِى خَلَقَ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضَ بِقَٰدِرٍ عَلَىٰٓ أَن يَخْلُقَ مِثْلَهُم ۚ بَلَىٰ وَهُوَ ٱلْخَلَّٰقُ ٱلْعَلِيمُ إِنَّمَآ أَمْرُهُۥٓ إِذَآ أَرَادَ شَيْـًٔا أَن يَقُولَ لَهُۥ كُن فَيَكُونُ فَسُبْحَٰنَ ٱلَّذِى بِيَدِهِۦ مَلَكُوتُ كُلِّ شَىْءٍ وَإِلَيْهِ تُرْجَعُونَ

So many interesting specs were absent in this video

What a clever contraption.

Imagine getting a corner of your shirt stuck in one.

This type of linear actuator would outperform just about any other actuator when used to drive YoutTube likes if applied to a video with exciting music and arbitrary CAD.

I can just about operate a tin-opener, but I love shit like this.

what's the advantage over a regular nut? On a regular nut surface contact between the screw threads and the nut is larger than in the roller screws case so what's the advantage? It seems to me the regular screws are more rigid/stiff than this. Is the advantage no backlash? If so how is it achieved?

Fantastic video

please, this factory has manufactured roller screw over 50 years....it was applied in many applicaitons you just don't know

The animation should have included barber stripes on the lead screw and the planets so that it was more obvious what was going on here.

Overengineered nut?

I guess this can be used for manufacturing lathes that need 1/5000” in of precision

I don't know why I'm watching this but at least I know about planetary roller screws now

So an over engineered nut with less friction on the bolt thread and decreased holding strength, but each of your inner threads have their own friction from each other, so you may have actually created more friction overall. It does look cooler than a regular nut though so I guess that's nice.

this feels more like a rick & morty interdimensional cable clip

Holy crap, this is exactly what I was building as the extruder for my 3d printer.

Some genius neckbeard is turning one of these into an industrial fleshlight as i type this

Engineering at his best

Идея интересная. Очень. Для прецизионных приборов и лабораторных условий.

Ive got to take a closer look but I believe something like this is used in our big mixers at work that were made by AMF and are pretty old.

great improvement

What do you have against a tanium nut? The fact of the matter is that threaded rod was spinning too. A nut would work since that's the case.

Износ резьбы будет просто бешеный из-за значительного уменьшения площади соприкосновения. Пока что лучшим способом после гайки остается только прецизионная шарико-винтовая передача

how is this even remotely high speed or acceleration when compared to ball screws?

I don't know why, but I like this

Interesting mechanism, great animation< what's it for again??? Oh yeah did you know looped music was invented to drive us all insane???????????

This seems much better than linear bearing sleeves on rods for 3D printer z axis screw.

Looks like dust ingress would be a huge issue long term.

@ThisOldTony - I miss your content - how about one of these

So what is this, some kind of heavy-duty linear actuator?

How you deal with the debris?

Это называется МЫШИННАЯ ПЕРЕДАЧА . мы ставили её в домкраты . она надёжна - проста и дёшева.

if you are a machinist you can make your own,it didn't look complicated to me. ah yes" left or right"

Is this better than ball screw nut?? I would like to try one for my application. But I will need left and right threaded leadscrews.

RIP those who can't afford normal ball screws

I'm surprised by the negative comments, that Alaskan Airlines Jackscrew failure in 2000 cost 88 lives, If this system is better and could have saved lives just what is wrong with it?

I need some of these for my 3D printer.

Video liked for no reason!

I like planetary roller screws.

This is good work in space only!

Wow. My tiny brain hurts even more now.

How does it compare to the ball screw coupling.

The strength of this system would be massive. Planetary reduction gearbox systems are high torque output. Anyone know if this method has exploration/ core drilling applications?

Interesting design. You get speed reduction and torque increase as a consequence. The increase in the contact area of the worm-shaped planetariums gives the unit great durability, this, together with a well-chosen material, provides perfection in the design. A question. How do you get the motorization of the system? who moves it? Maybe that was missing from the video. Thank you very much and greetings.

The algorithm brought me here

whats providing the power to turn the planetary scews?

surface-to-surface speed is higher with this design than with rolling ball. These are more complex and require numerous ball bearings. Thanks, but I'll stick with ball screws for now.

seems to possibly be a high wear item based on the surface speed of the mating surfaces

This is really cool!

I wounder how they'll rack up against acme tread for cnc work

got to say. i've got some high axial stiffness after watching this.

Now that looks cool

I learned this concept chasing submarines. Ring, Sun, Planet gears?

Neat but the number of points of failure and the complexity would require clean room operating conditions.

So this replaces a hydraulic ram and cylinder? Or rather a pair of rams in opposition. Nice idea.

How does this compare to a ball screw? Advantages vs disadvantages.

I would call it a roller nut. Like they call ball screws when they are really ball nuts.

Looks very good.

seems interesting but where is the motor?

I don't get it. The first part of the animation make it look like it acts as a roller bearing, with no movement of the assembly relative to the leadscrew. The rest shows the outer casting spin as well as the leadscrew. Is it meant to be a roller bearing, a positioning screw/nut, both, neither? That animation leaves me with more questions than answers.

Great idea.

horizontal elevators - or vertical ones for the Moon & starships

it's bearing with extra steps

Perfect 👍

Music name, please?

hey bro i reinvented the NUT.

I wonder how effective they are in a press operation compared to hydraulics.

Yes, that is absolutely delicious.

So how'd you bypass the 3-gear rule?

What is causing the rotation?

This is how a typical flap actuator works on any large aircraft.

Imagine making a J damper with one of these