How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]

Posted by unclefuzzy 10/26/2024

How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video](www.youtube.com)

275 points | 80 commentspage 2

guenthert 10/26/2024|

I don't see how the second sensor would improve accuracy (or rather precision). iiuc, the second sensor allows for improved speed. Backlash of the motor (and gears and linkage) could be accounted for using a PID controller, no?

Said that, I'm impressed how precise this rather flimsy looking robot actually is.

elif 10/26/2024||

I have a hunch that Optimus likewise leans heavily upon inverse kinematic modeling. However not using the paper plate tech.

It would be sick if they use a pure vision ML approach to train a heuristic understanding of its own muscles, instead of these fixed rotary encoders which do not account for material deflection, sensor dislodgement, etc. sort of like meta quest player tracking in the SLAM loop.

dreamcompiler 10/26/2024||

Closed loop feedback is the key to high robot accuracy with cheap parts. The big trick is the position detector, and this person figured that out.

Kudos!

luikore 10/26/2024||

With direct drive (no gear box), do we still need the secondary encoder?

mglz 10/26/2024|

No, but you will almost certainly not get the required torque for a robot arm.

iancmceachern 10/26/2024||

In addition to this technique you can also use kinematic calibration which takes it to a whole other level.

emmelaich 10/26/2024||

I think £300 is an important part of the title.

smolder 10/26/2024||

I'm not a fan of the youtube link trend on HN, as cool as the latest robots are. I know they're encroaching on territory previously held by much heavier additive and subtractive machines.

defanor 10/26/2024||

And I am okay with YouTube when a video makes sense, but in this case they have basically crammed a short article into a video, making it more awkward to read: slides with texts and diagrams, with some background music, and only a video demonstration in the end.

avodonosov 10/26/2024||

I also caught myself thinking that most of the content would be more accesdible as an article - I needed to pause and rewind several times. Although the aticle would include some video fragments (the final demo and some others)

bob112 10/26/2024|||

Are you saying you don't like video and would prefer text, or is it something specific to YouTube that you object to? For many topics, video is really helpful in understanding stuff.

smolder 10/26/2024||

It's a mix of both, I guess. I don't like youtube taking over for text based sources. It's less accessible, way less efficient, and feeds into the google surveillance machine.

blamazon 10/26/2024||

This doesn't address your (valid) systemic concerns, but on efficiency the way I like to use links like this is by adding them to a queue for later, then, if I have an opportunity to play them while doing the dishes or commuting or just feeling like watching a television I play them back, usually at higher speed of playback than 1.0. If I'm just sitting on the couch actively watching I'll read ahead in the transcript and skip ahead if I feel like it.

d0mine 10/26/2024||

Unlike the web, youtube has a functional search ;)

dr_dshiv 10/26/2024|

I love hackernews