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Page 1 of 5 1

by Snoopy
Replies
3
Views
13,802

by Snoopy
Replies
11
Views
27,466

OK. Thanks
3. ## Thread: Baudrate for dynamixels

by Snoopy
Replies
11
Views
27,466

### Question(s)Re: Baudrate for dynamixels

Thanks jwatte. For Moving Threshold, what value do you recommend? Do you set the Moving Threshold and Return Delay Time of all motors within the same robot to the same respective values? Do you...
4. ## Thread: Baudrate for dynamixels

by Snoopy
Replies
11
Views
27,466

### Question(s)Re: Baudrate for dynamixels

Thanks. These are all very good questions that I need to think about. I plan to use U2D2, XH series, Protocol 2.

From the emanual you linked, the Return Delay Time "delays transmitting the Status...
5. ## Thread: Baudrate for dynamixels

by Snoopy
Replies
11
Views
27,466

### Question(s)Re: Baudrate for dynamixels

Thanks.

I see many factors are involved. Is there a formula to calculate the recommended baud rate given the control loop frequency and the number of servos? Ideally I hope to get 1ms respond...
6. ## Thread: Baudrate for dynamixels

by Snoopy
Replies
11
Views
27,466

### Question(s)Re: Baudrate for dynamixels

Thanks KurtEck. By long wire, how long are you talking about?
7. ## Thread: Baudrate for dynamixels

by Snoopy
Replies
11
Views
27,466

### Question(s)Baudrate for dynamixels

Hi, it looks like some members in the forum use baud rate of 3M BPS. Is there a reason for that if 4M or 4.5M BPS are available? Is the higher the baud rate always the better since it allows higher...

by Snoopy
Replies
4
Views
9,228

Thank you.
9. ## Thread: Conversion between angle and position values

by Snoopy
Replies
4
Views
9,228

### Re: Conversion between angle and position values

Thanks jwatte. My simulator has 0 as the center and +- value degrees to indicate the amount of turning and whether it is turning clockwise or counter-clockwise.

In previous projects, I used...
10. ## Thread: Conversion between angle and position values

by Snoopy
Replies
4
Views
9,228

### Conversion between angle and position values

Hi, I have question about converting between rotational angle in degree and positional values accepted by dynamixel.

I have not built a robot but different motors can be oriented differently...
11. ## Thread: Is it normal that even with the same model, some dynamiels generate some sound?

by Snoopy
Replies
5
Views
42,314

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

Thanks. What do you mean by "twang"? For this test, since there are so many positions, is testing each motor under 2-5 different positions sufficient?

As for the torsion springs, don't they...
12. ## Thread: Is it normal that even with the same model, some dynamiels generate some sound?

by Snoopy
Replies
5
Views
42,314

### 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...
13. ## Thread: Is it normal that even with the same model, some dynamiels generate some sound?

by Snoopy
Replies
5
Views
42,314

### 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...
14. ## Thread: Anybody tried replacing the Pi3 in TurtleBot3 with the Pi4?

by Snoopy
Replies
0
Views
9,568

### Question(s)Anybody tried replacing the Pi3 in TurtleBot3 with the Pi4?

Does it work well? Is it straightforward to install?
15. ## Thread: How to test Dynamixels upon arrival

by Snoopy
Replies
7
Views
13,141

### Re: How to test Dynamixels upon arrival

Thanks Kevin.

by Snoopy
Replies
7
Views
13,141

Thanks
17. ## Thread: How to test Dynamixels upon arrival

by Snoopy
Replies
7
Views
13,141

### Re: How to test Dynamixels upon arrival

Is it recommended to always update the firmware upon receiving the dynamixels?
18. ## Thread: Discharge rate of LIPO

by Snoopy
Replies
5
Views
56,599

### Re: Discharge rate of LIPO

Thanks jwatte.
19. ## Thread: Is it easy to change the adapter of those Robotis cables?

by Snoopy
Replies
6
Views
11,090

### 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?
20. ## Thread: Discharge rate of LIPO

by Snoopy
Replies
5
Views
56,599

### 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...
21. ## Thread: Discharge rate of LIPO

by Snoopy
Replies
5
Views
56,599

### 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...
22. ## Thread: How to test Dynamixels upon arrival

by Snoopy
Replies
7
Views
13,141

### Re: How to test Dynamixels upon arrival

Thanks KurtEck.
23. ## Thread: How to test Dynamixels upon arrival

by Snoopy
Replies
7
Views
13,141

### 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?

by Snoopy
Replies
6
Views
11,090

Thank you
25. ## Thread: Is it easy to change the adapter of those Robotis cables?

by Snoopy
Replies
6
Views
11,090

### 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...
26. ## Thread: Is it easy to change the adapter of those Robotis cables?

by Snoopy
Replies
6
Views
11,090

### 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...

by Snoopy
Replies
8
Views
15,137

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?

by Snoopy
Replies
8
Views
15,137

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...

by Snoopy
Replies
8
Views
15,137

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?
30. ## Thread: Voltage for 6 Port AX/MX Dynamixel Power Hub

by Snoopy
Replies
13
Views
94,332

### Re: Voltage for 6 Port AX/MX Dynamixel Power Hub

removed

by Snoopy
Replies
8
Views
15,137

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...
32. ## Thread: What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

by Snoopy
Replies
4
Views
10,312

### 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.
33. ## Thread: What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

by Snoopy
Replies
4
Views
10,312

### 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?
34. ## Thread: What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

by Snoopy
Replies
4
Views
10,312

### 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...
35. ## Thread: Project Khepri - MX 106 hexapod.

by Snoopy
Replies
7
Views
61,508

### 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...
36. ## Thread: What is the best way to remove the horn of the Dynamixel?

by Snoopy
Replies
8
Views
39,855

### 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.
37. ## Thread: What is the best way to remove the horn of the Dynamixel?

by Snoopy
Replies
8
Views
39,855

### 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...
38. ## Thread: What is the best way to remove the horn of the Dynamixel?

by Snoopy
Replies
8
Views
39,855

### 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.

The width of...
39. ## Thread: What is the best way to remove the horn of the Dynamixel?

by Snoopy
Replies
8
Views
39,855

### 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...
40. ## Thread: Companies that make aluminum frames and thickness of 3D printed frames

by Snoopy
Replies
5
Views
57,819

### 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?
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