Seeking advice on collaborative robots calibration and maintenance

  • Would you be able to provide some answers on collaborative robots that have two arms or those applications that use two separate robots with single arm working in coordination?

    1) Is there a problem with tolerance and calibration? (Technically or business wise)
    2) How do you detect when sensors are misaligned? Is it a business challenge?
    3) How challenging is it to maintain and calibrate the arms of robots?


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  • you need to be way more specific than that....

    what type of tolerance and calibration exactly you have in mind? position, force, sharing load, something else...?

    what sensors?

    what robot arms?

    non-collaborative robots are routinely position calibrated. one or multiple arms does not matter. excessive torque or current is sensed as a fault. any additional sensing systems will need to be checked for function in order to determine deviations.

    collaborative robots are different thing all together since they include added complexity but this line of products is just evolving and everyone is developing own technology which makes comparisons difficult.

    i am famliar with KUKA and LBR IIwa is very sensitive thanks to using actual torque sensors on every joint. some other brand may simply put some foam on standard (non-collaborative) robot arm and place the entire robot on a single force/torque sensor. this is far less sensitive since weight of the robot acts on the sensor and detection of subtle external contacts with arm are indistinguishable from noise. some may simply use arm that is simply slow and under-powered so it cannot cause significant injury. some may not really interact, they fault out when sensing contact and need intervention to restart or resume operation. you can really tell the difference when interacting with the actual arm.

    each technological approach can have pluses and minuses so one has to be careful with selection (cost, range of features, number of joints, sensitivity, speed, accuracy. reliability, ability to do field repair etc.). and this is why comparisons are difficult. really need to evaluate which products are suitable for the application, then compare specific criteria.

    1) read pinned topic: READ FIRST...

    2) if you have an issue with robot, post question in the correct forum section... do NOT contact me directly

    3) read 1 and 2

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