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  1. Re: Is it normal that even with the same model, some dynamiels generate some sound?

    Hi jwatte. Thanks for the suggestion. I did a test on two motors separately. They behaved as following:

    I connected a motor to a PC and scanned it under Dynamixel Wizard. The software found it. I...
  2. Is it normal that even with the same model, some dynamiels generate some sound?

    Hi, even with the same model, some units generate some sound when they are powered (no load and not being turned). I just plugged them to a controller one by one and assigned ID and Baudrate under...
  3. Question(s) Anybody tried replacing the Pi3 in TurtleBot3 with the Pi4?

    Does it work well? Is it straightforward to install?
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    Re: How to test Dynamixels upon arrival

    Thanks Kevin.
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    Re: How to test Dynamixels upon arrival

    Thanks
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    Re: How to test Dynamixels upon arrival

    Is it recommended to always update the firmware upon receiving the dynamixels?
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    Re: Discharge rate of LIPO

    Thanks jwatte.
  8. Re: Is it easy to change the adapter of those Robotis cables?

    Hi jwatte, McMaster sells so many different types of cable sheathings. Which one do you recommend?
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    Re: Discharge rate of LIPO

    Thanks KurtEck and jwatte. I am trying to decide between three batteries. They all have the same mHh. One has C=75 but 20-30g heavier. The other two have C=60. At such high C values, although the one...
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    Discharge rate of LIPO

    Hi, when choosing LIPO for MX-106 class high toque motors, is there a range of C values that I should be looking for? Is there a threshold C value above which there is no advantage or perhaps even...
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    Re: How to test Dynamixels upon arrival

    Thanks KurtEck.
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    How to test Dynamixels upon arrival

    Hi, when receiving expensive Dynamixels, what should one check to make sure that they arrived without any issue? Is updating the firmware the first thing to do?
  13. Re: Is it easy to change the adapter of those Robotis cables?

    Thank you
  14. Re: Is it easy to change the adapter of those Robotis cables?

    Thanks. I made custom cables many years ago. I know that I am not very good at it.

    Is it a bad idea to change the connectors soldered in the hub or controller board instead?

    What is the name...
  15. Is it easy to change the adapter of those Robotis cables?

    Hi, I need convertible cables longer than the 180mm one sold by Robotis. is it easy to remove the connectors from Robotis current cables for the X-series and older cables with MOLEX connectors? Any...
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    Re: Questions about powering

    Thanks KurtEck. Yes, I worry that accidentally I may connect the + pins of the batteries together and damage those expensive motors. So better to use only one battery for all the dynamixels?
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    Re: Questions about powering

    Thanks. I know the concepts of serial and parallel connection of batteries as shown below.

    https://batteryuniversity.com/learn/article/serial_and_parallel_battery_configurations

    However, I...
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    Re: Questions about powering

    Thanks jwatte. Am I correct that I also have to connect the ground of the controller, PC or SBC and the batteries for the dynamixels?
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    Re: Voltage for 6 Port AX/MX Dynamixel Power Hub

    removed
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    Questions about powering

    Hi, I recall reading something like if two batteries connecting to a system of dynamixels within the same robot are not of the same capacities or at different charge levels, then the dynamixels could...
  21. Re: What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

    Thanks. I will check with customs.
  22. Re: What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

    Thanks KurtEck.

    Is there any point to buy all required servos together at the same time?
  23. What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

    Hi, I see some users posting photos of their components before making their robots. What are the pros and cons of buying the required number of Dynamixel all at the same time vs. buying in 2-3...
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    Sticky: Re: Project Khepri - MX 106 hexapod.

    This is a very nice robot. At 1:22, I see a Trossen powered hub on each side with a thick red and black wires. Where are they connecting to? Are they connected to each other and then to a battery for...
  25. Question(s) Re: What is the best way to remove the horn of the Dynamixel?

    Thanks jwatte. I have successfully removed the horn. When I did that, I heard a pop sound. Hope it was just a sound caused by the horn being separated from the shaft.
  26. Question(s) Re: What is the best way to remove the horn of the Dynamixel?

    Thanks. I need to slowly digest your procedure. Maybe 3D print a thick plastic with three or five holes.

    I don't have M2 screws with me so I will need to order online. Giving the outbreak...
  27. Question(s) Re: What is the best way to remove the horn of the Dynamixel?

    Thanks tician. I don't know if the X-Series is similar. What do you think of the tool used in this video? The idea seems to be similar.

    https://www.youtube.com/watch?v=0Xof5-JkpU8

    The width of...
  28. Question(s) What is the best way to remove the horn of the Dynamixel?

    Hi, I inserted a horn on the X-series motor shaft. Then, I found that I was supposed to put a washer in between first. In this case, should I leave the motor as is? Could removing the horn easily...
  29. Question(s) Re: Companies that make aluminum frames and thickness of 3D printed frames

    Nice. Is there a reason you used PETG rather than other materials? What places would need enough plastic?
  30. Question(s) Re: Companies that make aluminum frames and thickness of 3D printed frames

    Thanks jwatte. I made 3D printed frame for the MX-106 in the past but it broke. Yes, setup costs for the first part is a problem. Do you mean if I go for 3D printing, sintered nylon is better than...
  31. Question(s) Companies that make aluminum frames and thickness of 3D printed frames

    Hi, can you please recommend good companies that can make nice aluminum frames at reasonable costs when CAD data are given by the customers? What kind of materials should I choose? In case of using...
  32. Question(s) Re: Do I need LIPO battery to power the Open CM9.04C with the 485 Extension Board?

    Thanks jwatte
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    News/Announcement Re: Turtlebot3 with Openmanipulator

    Based on your experience, do you see any point in getting the $150 base plate when it can be mounted on a TB3 Waffle Plate at 1/10 the cost? I am trying to save some money. I guess one needs to put a...
  34. Re: How useful are broadcast ID, Bulk Read/Write and Sync Read/Write? How often do people use them?

    Thanks KevinO.
  35. Question(s) Do I need LIPO battery to power the Open CM9.04C with the 485 Extension Board?

    Hi, I need some confirmation. If I have one SMPC power adapter, do I need a LIPO battery to power the following systems with dynamixels?

    a) OpenCM 9.04C+485 Extension Board
    b) OpenCR
    c) U2D2 +...
  36. How useful are broadcast ID, Bulk Read/Write and Sync Read/Write? How often do people use them?

    Hi, how often do all of you use these commands? Are these commands useful in controlling a robot with many motors? By using these commands, can I ask different motors to move differently at the same...
  37. Question(s) Re: In practice, any difference between the XM and XH series?

    Has anybody else used both series?
  38. Question(s) Re: Can we get accurate torque and current information from the dynamixels now?

    Thanks tician.
  39. Question(s) Re: Can we get accurate torque and current information from the dynamixels now?

    Thanks tician. Could you please explain what you mean by "flexible shaft" or two ends of a flexible shaft coupling? Do you have a photo? What LiPo capacity would be safe to use if I use high-end high...
  40. Question(s) Can we get accurate torque and current information from the dynamixels now?

    Hi, I recall that when the MX series came out few years ago, users were excited about the possibility to use the motors for torque control but at the end, they found that the motors could not provide...
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