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

    The rubber band has enough tension if you can pluck it with your finger and it sounds like "twang."

    Yes, torsion springs add more torque in one direction. But, if your robot is standing against...
  2. Re: Is it normal that even with the same model, some dynamiels generate some sound?

    Yes, that sounds exactly like an output that's under no load, and thus the PID controller is over-eager.
    Either add some load on the servo, or tune the PID to be sloppier (but then of course the...
  3. Re: Is it normal that even with the same model, some dynamiels generate some sound?

    The PID controller may be overshooting and re-correcting back and forth.
    Assuming this only happens when they're on, and torque is enabled.
    If you disable the torque, does the sound go away?
    ...
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    Re: OpenCM 9.04 and SPI

    In the Arduino API, "transfer" returns the byte that came back while it sent the argument byte.
  5. Re: Is it easy to change the adapter of those Robotis cables?

    Bob's Used Cars sell so many kinds of used cars and trucks, which one would you recommend?

    I recommend that you buy the one that seems to work for your application.

    If you have a hard time...
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    Re: Discharge rate of LIPO

    The difference between C=60 and C=75 doesn't matter at all.

    Also, at those levels, it's very likely the batteries are rated "optimistically" ("this is the largest possible current the battery...
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    Re: Discharge rate of LIPO

    The current capacity of a battery cannot "push" current into a circuit. The circuit draws as much current as it's designed/made to do at the voltage you provide it. If the power source cannot keep...
  8. Re: Is it easy to change the adapter of those Robotis cables?

    Net-like sleeves are called "cable sleeving" or "cable sheathing."
    https://www.mcmaster.com/cable-sheathing/
    https://amzn.to/30f5w8y
  9. Re: Is it easy to change the adapter of those Robotis cables?

    If you need custom cables, you'll want to buy the crimping kits for the connector series from the manufacturer, and your own wire to crimp the cables onto.
    The main challenge there is generally the...
  10. Question(s) Re: Attempting to send voltage to teenssy board via Arduino C++.

    I suggest the best forum to ask this in is https://forum.pjrc.com/forums/3-Technical-Support-amp-Questions
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    Re: Questions about powering

    Connecting the + pins on the batteries won't damage the motors, but it could damage the batteries, and perhaps the wiring between them, if the batteries are not charged to the same state.

    These...
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    Re: Reccomendations for a CS student

    Walking is quite challenging, mechanically. It sounds like a rover (wheeled robot) with sensors would be more up your alley.

    You might want to look into the Donkey Car approach? That's a...
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    Re: Questions about powering

    Correct. The system should have a single reference ground, will connected (low impedance.)
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    Re: Questions about powering

    Also: If you do use multiple batteries, you still have to have a shared ground (negative wire.) Don't forget that!
  15. Re: What are the pros and cons of buying the required number of Dynamixel at the same time? Your experience with Robotis return policy

    If you're going to build the robot, having all the servos at once might be helpful :-)
    Also, you save a little bit on shipping.
    On the other hand, if you're buying and shipping through customs,...
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    Question(s) Re: Connecting Dynamixel Motor to PC (Windows)

    Also: How are you powering the servo? The U2D2 can't power it itself, and an insufficient or flaky separate power source might cause problems.

    Does "recover servo firmware" in the Dynamixel Wizard...
  17. Re: [Beginner here with no experience] Need help with Ideas for implementing an automation process

    There are cases when I re-use fasteners.

    For example, when I assemble a 80/20 based trade show booth frame, I re-use the bolts and studs that go into the frame.

    When I re-hang a picture on my...
  18. Re: [Beginner here with no experience] Need help with Ideas for implementing an automation process

    If all you have is 4,000 fasteners (not 4,000 fastener TYPES) then you should do this manually. It'll take two hours, and then you're done.

    If you have 4,000 fastener TYPES that need to be sorted...
  19. Thread: Alan and Alena

    by jwatte
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    Project Re: Alan and Alena

    I wish you'd keep the camera from the front longer, and not cut away to the side so quickly :-)
    (Most youtube videos are under-edited, but not this one!)
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    Question(s) Re: AX12+ servos not recognized/seen

    Do you have a logic analyzer or oscilloscope?
    Can you verify the data being sent by the USB2Dynamixel?
  21. Question(s) Re: What is the best way to remove the horn of the Dynamixel?

    What I do for MX series servos, which works great, is:
    1) Remove the center screw.
    2) Screw in a bracket into the horn, using 4 screws at each 90 degree cardinal direction.
    3) Pull on this bracket...
  22. Re: Should we move Mech Warfare discussions to some other forum?

    There's some discussion going on here: https://forum.mechwarfare.org/
    So far, it hasn't fallen off the internet :-)
  23. Question(s) Re: Companies that make aluminum frames and thickness of 3D printed frames

    To make aluminum frames, the cheapest way is to make a watercut or lasercut shop cut them out of something bendable, like 5052.
    BigBlueSaw.com is one such company that can do that. You will then...
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    Re: First steps for Legavos

    Cool! The first walker I built was a three-servo variant, too!

    (You could also post a description on https://forum.mechwarfare.org/c/builds/6 and you'll get a forum "Builder" badge for it :-)
  25. Thread: mjbots quad A0

    by jwatte
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    Re: mjbots quad A0

    Looking forward to it!

    You should post it in https://forum.mechwarfare.org/c/builds/6 -- it'll give you a badge ;-)
  26. Re: Should we move Mech Warfare discussions to some other forum?

    Specifically, having a forum with history plus ability to keep uploads, doesn't come for free, anywhere.
    There's a "hosted Discourse" option, which is $100/month.
    Slack removes discussions after a...
  27. Thread: mjbots quad A0

    by jwatte
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    Re: mjbots quad A0

    pronking!

    What provides the most elasticity when landing? Feet, frame, belts, or PID loop?
  28. Re: Should we move Mech Warfare discussions to some other forum?

    Yeah, I'm looking at various options for archiving vbulletin!

    I'm happy to share admin duties -- in the first batch, I invited R-team as moderator, but anyone could really step up.

    Currently,...
  29. Re: Should we move Mech Warfare discussions to some other forum?

    I had the email address for some of you (mainly those I've met in person!)
    You may find an email from mechwarfare.org in your inboxes. If so, that's me, trying to set up a forum specifically for the...
  30. Re: Should we move Mech Warfare discussions to some other forum?

    "Discourse" is different from "Discord" -- it's a community platform built by some of the people who initially built stack overflow.
    The confusingly named "Discord" (used by all the l33t gamers) is...
  31. Re: Should we move Mech Warfare discussions to some other forum?

    Yeah, these forums are great for reference!

    hackaday.io doesn't seem quite right for a discussion forum though.

    I'm using my Cloud Powerz to try to set up a Discourse based forum on an...
  32. Re: Should we move Mech Warfare discussions to some other forum?

    We could also host a Discourse somewhere affordable. Digital Ocean, perhaps?
    The main problem is that we'd have to run a SMTP server, which always has some personal cost.
    (That being said, I do run...
  33. Re: Should we move Mech Warfare discussions to some other forum?

    Don't all the cool kids have a Discord these days?

    I think hackaday might be a good option, though. I'm jwatte on hackaday.io
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    Re: Mech Warfare 2020

    The math says it probably won't happen in May, I agree.

    On the other hand, the voluntary work-from-home regime could make for very robot-productive lunch and coffee breaks :-D
  35. Thread: mjbots quad A0

    by jwatte
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    Re: mjbots quad A0

    Oh, neat!
    Still, you need to have a part number for them :-D
  36. Thread: mjbots quad A0

    by jwatte
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    Re: mjbots quad A0

    Probably not the most burning question, but what is the part number for those oval rubber feet?
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    Re: Mech Warfare 2020

    I need to get the bot working again, what better deadline? I'll likely be there.
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    Question(s) Re: Arbotix Pro doesn't recognize MX106T motors

    You will need an oscilloscope with capture, or a logic analyzer, to figure out what's different between the TTL bus signal of the Arbotix, and the U2D2 device. Assuming they're using the same baud...
  39. Re: How useful are broadcast ID, Bulk Read/Write and Sync Read/Write? How often do people use them?

    I use broadcast ID a lot, and sync write for writing a pose quicker than writing each servo individually. I don't use protocol 2.0, so I don't use bulk read.

    Broadcast ID is cool for things like...
  40. Question(s) Re: Do I need LIPO battery to power the Open CM9.04C with the 485 Extension Board?

    The U2D2 doesn't work without a PC; it is a "dumb" serial port adapter with no smarts.

    The OpenCM can run fine on the power supplied through the DXL bus, and can also supply power to the DXL bus...
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