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]
#2that is a really great encoder trick. I wouldn't have thought it was that good, but it clearly is.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#3[deleted]
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#4I'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.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#5that is a really great encoder trick. I wouldn't have thought it was that good, but it clearly is.
What their video demonstrates is mostly same-direction repeatability, not absolute static accuracy. They can correct for with backlash at individual motors, but not slop or bend in the linkages.
This uses DC motors. If you use modern 3-phase servomotors, you know more of what the motor is doing.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#6I love hackernews
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#7I've seen in the past a different trick that is adding an IMU[1] to the robot arm. When combining two different types of sensors, it's called Sensor Fusion[2], and it's really common to put together a IMU with GPS and slap a Kalman Filter[3] for very accurate position reading.
The particularly cool thing of this video though is that they could mount the new sensor within the motor itself, making it all a lot more compact.
[1] https://en.wikipedia.org/wiki/Inertial_measurement_unit
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#8Great, 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 their planes and then using faulty attitude sensors is another.
I would be way more impressed if the robot did something useful. My suspicion is that its real world application capabilities are rather limited.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#9I'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.
Re: How can this 6 axis robot have a static accuracy of 0.05 mm? (2021) [video]
#10You can’t judge backlash by how the robot repeats the exact same set of movements over and over. That removes hysteresis from the problem definitionally.