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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]

#51

Post by sadhorse »

amelius wrote: post #48
xattt wrote: post #46

Earlier quoted context omitted.

If I’m not mistaken, one encoder measures the position and force applied by the motor, while the other encoder measure the position of the slack of the business end of the robot.

Doesn't this youtube project infringe on the patent which this company holds, then? https://electroimpact.com/Company/PatentFiles/US8989898B2.pd...

Legit question: if I replicate a patent for a personal non profit use, is this infringement? Perhaps it is because I'm benefiting from the intelectual property.

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

#52

Post by TacticalCoder »

I've always wondered... Why aren't pantographs used more with robots when precision is needed?

It's used to cut precise wood pieces or carve wood or metal etc.

https://en.wikipedia.org/wiki/Pantograph

https://youtu.be/s56J_Rnh_Co

You use the "big" part to drive the "small" one, which gives it great precision.

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

#53

Post by amelius »

sadhorse wrote: post #51
amelius wrote: post #48

Earlier quoted context omitted.

Doesn't this youtube project infringe on the patent which this company holds, then? https://electroimpact.com/Company/PatentFiles/US8989898B2.pd...

Legit question: if I replicate a patent for a personal non profit use, is this infringement? Perhaps it is because I'm benefiting from the intelectual property.

!> Yes, replicating a patented invention, even for personal, non-profit use, is technically considered patent infringement. A patent grants the inventor the exclusive right to make, use, sell, and distribute the patented invention for a certain period (usually 20 years from the filing date).

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

#54

Post by 5ADBEEF »

llm_trw wrote: post #20

If 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.

Be aware, per erratum 9, that you’ll need to include external pull-downs instead of using the internal ones

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

#55

Post by Luc »

sadhorse wrote: post #51
amelius wrote: post #48

Earlier quoted context omitted.

Doesn't this youtube project infringe on the patent which this company holds, then? https://electroimpact.com/Company/PatentFiles/US8989898B2.pd...

Legit question: if I replicate a patent for a personal non profit use, is this infringement? Perhaps it is because I'm benefiting from the intelectual property.

Depends where you live. E.g. in France there's a personal use exemption, in the US there mostly isn't.

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

#56

Post by elif »

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.

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

#57

Post by leovailati »

acyou wrote: post #8

Great, 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…

Regarding applications for robots that have to move very precisely without carrying a load, there are robotic measurement systems: https://en.wikipedia.org/wiki/Coordinate-measuring_machine

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

#58

Post by WJW »

amelius wrote: post #48
xattt wrote: post #46

Earlier quoted context omitted.

If I’m not mistaken, one encoder measures the position and force applied by the motor, while the other encoder measure the position of the slack of the business end of the robot.

Doesn't this youtube project infringe on the patent which this company holds, then? https://electroimpact.com/Company/PatentFiles/US8989898B2.pd...

How is that patent even a thing from 2009? Position feedback in robots is WAY older than that. I have textbooks at least a decade older than that patent describing that very system, so I wouldn't be surprised if it falls over at the first prior use claim it encounters.

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

#59

Post by RobotToaster »

sadhorse wrote: post #51
amelius wrote: post #48

Earlier quoted context omitted.

Doesn't this youtube project infringe on the patent which this company holds, then? https://electroimpact.com/Company/PatentFiles/US8989898B2.pd...

Legit question: if I replicate a patent for a personal non profit use, is this infringement? Perhaps it is because I'm benefiting from the intelectual property.

In the USA there's an exemption for research use of patents, specifically for "amusement, to satisfy idle curiosity, or for strictly philosophical inquiry." https://en.wikipedia.org/wiki/Research_exemption

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

#60

Post by alpaca128 »

KeplerBoy wrote: post #27
mmoustafa wrote: post #13

Earlier quoted context omitted.

It’s the compromise between a gantry vs arm design

There are plenty of 3d printers without a complete gantry. The bambulab a1 mini or prusa mini to name just two.

Those two printers are also smaller and not as accurate at high speeds. The A1 Mini's slicer automatically places parts close to the Z axis in an attempt to reduce the issues and it uses input shaping, but given the printer can lift itself off the ground at default speeds that's not a perfect solution either.

There's a reason the larger and faster printers often use the CoreXY design instead.

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