How do 3 axis robots you can buy for 100$ (3D printers) have a static accuracy of 0.05mm?
It's not control theory, but mechanics and steppers.
How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
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Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#12I'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.
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.
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.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#13How do 3 axis robots you can buy for 100$ (3D printers) have a static accuracy of 0.05mm? It's not control theory, but mechanics and steppers.
It’s the compromise between a gantry vs arm design
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#14Great, but that robot isn't doing an actual task? I sort of struggle to see how getting good positioning accuracy from a high backlash system under zero load can have a useful application. Maybe just lack of imagination on my part. There is this trend that says make and buy bad hardware, the software will solve it. I haven't noticed that paying off. Tesla using webcams for self driving is an example. Boeing designing…
You have oversimplified the Boeing one: their goal was to create an efficient plane to compete with Airbus without needing the expense and delays of a new type certification.
To do this they needed bigger engines on the same frame, which in turn needed to be mounted further forward affecting flight characteristics and requiring retraining. Retraining would be a sales killer so they hacked on some software systems to attempt to make the plane fly like an older 737.
Then they can just use an iPad training course for pilots to upgrade. The augmentation had to avoid the pilot knowing about (I think) the plane getting stuck in a stall at a too high AoA (this is where my memory might be off...) so the MCAS software uses AoA sensors to nose down based on the detected AoA.
The AoA sensors were never designed to be used for a direct life and death critical use case and sometimes they got stuck or failed. MCAS only used one as an input. If MCAS incorrectly asseses a nose down is required and the pilot follows their 737 training they are having their last day. That plane is going down.
Bascially people were murdered by Boeing so at every stage of this wretched plan they can make more money.
I think you are right but Boeing was more of perhaps the worst possible asshole design, and deserves it's own league.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#15Question for anyone who has used one of these analog measuring devices: the indicator seems to go all the way around before the camera zooms in to read the indicated value. Is this video actually showing the accuracy it is claiming?
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#16Great, but that robot isn't doing an actual task? I sort of struggle to see how getting good positioning accuracy from a high backlash system under zero load can have a useful application. Maybe just lack of imagination on my part. There is this trend that says make and buy bad hardware, the software will solve it. I haven't noticed that paying off. Tesla using webcams for self driving is an example. Boeing designing…
You have oversimplified the Boeing one: their goal was to create an efficient plane to compete with Airbus without needing the expense and delays of a new type certification. To do this they needed bigger engines on the same frame, which in turn needed to be mounted further forward affecting flight characteristics and requiring retraining. Retraining would be a sales killer so they hacked on some software systems to…
There’s some really negligent stuff, like changing how to disable auto pilot (ie, MCAS) — as the pilots of both crashed planes attempted actions that would have disabled the autopilot on previous models.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#17Great, but that robot isn't doing an actual task? I sort of struggle to see how getting good positioning accuracy from a high backlash system under zero load can have a useful application. Maybe just lack of imagination on my part. There is this trend that says make and buy bad hardware, the software will solve it. I haven't noticed that paying off. Tesla using webcams for self driving is an example. Boeing designing…
You have oversimplified the Boeing one: their goal was to create an efficient plane to compete with Airbus without needing the expense and delays of a new type certification. To do this they needed bigger engines on the same frame, which in turn needed to be mounted further forward affecting flight characteristics and requiring retraining. Retraining would be a sales killer so they hacked on some software systems to…
Wasn’t the Boeing issue completely preventable with an inconsequential extra part that cost nothing? Like the short cuts actually worked but they literally went all the way to almost succeeding and snatched defeat from the jaws of victory. (Aside from all the other things they did that also contributed to disaster situations going worse)
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#18Question for anyone who has used one of these analog measuring devices: the indicator seems to go all the way around before the camera zooms in to read the indicated value. Is this video actually showing the accuracy it is claiming?
I haven’t watched the whole video, but I’m assuming what they were showing was ‘move x from 0.00 to 10.00’ with the gauge showing the final move was to (actual) 10.05.
Which with how floppy that rig is, is pretty impressive.
Notably though, those gauges do need to be ‘preloaded’ (compressed into their ‘positive’ range) to be able to measure negative direction shifts, and while it looks like that was done, I can’t be 100% sure without analyzing it far more than I want to do right now.
Also, those gauges provide a degree of preload (not much, but some), which might be taking a bunch of slop out of the system and giving overly rosy accuracy numbers.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#19I'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.
Unlike the web, youtube has a functional search ;)
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#20If anyone wants to build this sort of thing the new Raspberry Pie Pico 2 is both orders of magnitude more capable than the chip used here and also around half the price.
It's by far the best value for money for an introductory 32bit ARM/Risk embedded device right now.