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  1. 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 :-)
  3. 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 ;-)
  4. 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...
  5. 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?
  6. 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,...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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
  13. 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
  14. 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.
  16. 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...
  17. 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...
  18. 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...
  19. Question(s) Re: Can we get accurate torque and current information from the dynamixels now?

    I would assume that most servo motors that provide "torque control" actually measure the relationship between "current" and "torque" and actually implement it as "current control."
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    Question(s) Re: Where to start [Q]

    Try starting with some project that already exists. For example, https://www.donkeycar.com/
    It uses a Raspberry Pi to drive a small RC car around a race track, and it has reasonable tutorials.
    Once...
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    Re: XL430 Overload Error

    The overload error is thrown when the configured maximum PWM value is exceeded for several seconds. Thus, if you configure a lower PWM maximum value, and the servo cannot hold its position, and it's...
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    Re: Qt and serial programming questions

    It sounds like the problem you have is related to using QT or using the tools in question, not robotics in particular.
    You'll probably get a much better answer if you ask in a forum dedicated to...
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    Question(s) Re: What IDEs just work for ROS?

    The problem with IDEs in general, is that you have to be solving a problem that the IDE developers have already wanted to solve.
    Unfortunately, when you do something that's not "super common," then...
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    Re: 2018 Tucson Mech Brawl

    I was trying to get Onyx back up to snuff (with the new feeder design and the new PCB) but the coolant pump on the mill failed and apparently spare parts are only found in some untracked container in...
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    Re: Been a long time 3d printed Animatronics

    I didn't see it wink, but I guess you can do it, with separate servos for left/right?
  26. Question(s) Re: Weird problem: either all dynamixel AX12's discovered or none.

    If it affects all servos, it's more likely a short than a loose connection.
    it could be a bad connector (more likely than a cable) or it could be a bad solder joint on a board/hub or it could be a...
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    Question(s) Re: Xbee Pro on Arbotix M board

    The data rate of the Xbee may not be sufficient to support the communication protocol of the controller.
    I forget what the rate of the controller is.
    Note that I'm talking about...
  28. Question(s) Re: Weird problem: either all dynamixel AX12's discovered or none.

    Some things to check:
    If there's an intermittent short somewhere, it could make the TTL bus not work right.
    If there's a power loss to the serve power rail, it could affect all of them.
    If the bus...
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    Bioloid Re: Bioloid Library for OpenCM 9.04

    The OpenCM 9.04 is a 32-bit ARM board.
    The Bioloid library you're using was intended to run on an 8-bit AVR microcontroller, with 16-bit address space.
    It would be possible to update the code in...
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    Re: Making a mechanical gyro?

    How fast can you spin that encoder before it starts losing steps?
  31. Thread: Malum IK

    by jwatte
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    Re: Malum IK

    [quote]More crammed than this 33x50mm thing?[/COLOR]

    Probably not on average, but the dual-rail buck converter area, and the video-switch-and-general-inverter area are both quite full!
    ...
  32. Thread: Malum IK

    by jwatte
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    Re: Malum IK

    7632

    Not sure this is all that useful. The board is fairly crammed, so it's hard to tell from the CAD. Maybe I'll remember to take a photo when I get home.
  33. Thread: Malum IK

    by jwatte
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    Re: Malum IK

    They didn't have QFN footprints to match, so I constructed them in KiCad using the recommended dimensions from the data sheets. Also: I use "QFN" to mean all the packages with pads on the bottom but...
  34. Thread: Malum IK

    by jwatte
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    Re: Malum IK

    I have used exactly this circuit to interface between Teensy 3.2 and 3.5 and the DXL bus, yes!

    The RX pin has a 560 Ohm / 1 kOhm resistive divider to translate the 5V of the buffer chip down to...
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    Re: Making a mechanical gyro?

    Oooh, that'd be awesome!
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    Re: servo sequencing program? bipedal walker.

    Those are RC servos, using PWM control. You can generate such pulses from any of the Arduino boards, using the Servo library.
    I'd recommend using a Teensy, but really, any of the Arduino-like boards...
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    Re: Mech Warfare at the NorCal Robotics Expo

    I'd like to attend if possible, too!

    Also, I'd like to help a bit, perhaps with scoring plates or somesuch. Maybe we can make an order to Macrofab for the manufacture?
    I may have one or two spare...
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    Re: Making a mechanical gyro?

    That's what the magnetometer (and ideally also a GPS input) is supposed to help you solve, using some kind of Kalman conditioning.
    Another option is to mount the IMU on a thick sorbothane substrate....
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    Re: Making a mechanical gyro?

    Optical flow from a camera to detect movement and orientation isn't half bad!
    You could get a NVIDIA Jetson something-or-other and a camera for it; they already have some software demos to show how...
  40. Thread: Pronking robots

    by jwatte
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    Pronking robots

    https://youtu.be/G6fMV1UPzkg?t=29
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