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

    "A low-cost compliant 7-DOF robotic manipulator" (pdf here)
    Involves two disks linked with rubber tube stuck in cutouts in the disks to make compliant linkages (flex couplings) that allow fairly...
  2. Question(s) Re: Can we get accurate torque and current information from the dynamixels now?

    I have not used Robotis stuff in a few years, but I specifically recall the MX-28 having neither current-limiting motor drivers nor current sensors. It had only a magnetic encoder and an H-bridge...
  3. Thread: Malum IK

    by tician
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    Re: Malum IK

    I was never able to access jwatte's and mine is no longer showing the thumbnail or even properly linking the image. Might be because of "invalid token"/timeout -> re-open in new tab -> restore...
  4. Thread: Malum IK

    by tician
    Replies
    69
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    17,623

    Re: Malum IK

    More crammed than this 33x50mm thing?

    7640

    ATSAM D21 for control with 32k crystal, primary TB67S249 stepper driver, secondary DRV8871 brushed DC driver (for solenoid-based shutter), two...
  5. Thread: Malum IK

    by tician
    Replies
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    17,623

    Re: Malum IK

    Robotis ran into dead IC problems when using a single two-channel buffer on their earliest CM-900 boards, so they switched to two one-channel buffers at different voltages (5V TX to buss; 3.3V RX to...
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    Question(s) Re: Arduino 1.8.10 ?

    The board manager definitions from this thread will probably still work......
  7. Re: Question about a particular omnidirectional robot design

    Pretty much anytime I hear omnidirectional, it is some sort of omni-wheel or mecanum wheel system (even 3 or 4 omni-wheels balancing on a large ball for single ground contact point). Suppose the...
  8. Re: Question about a particular omnidirectional robot design

    I've usually seen that design referred to as some variant/combination of "steered/steerable/powered caster". The willowgarage pr2 was one of the better known designs using it, so that is another...
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    Project Re: More Mule then Rover?

    Just needs a new boot on the spark plug connector... and might be a bit under-powered for that alternator at full load. 1[hp] is 746[W], so even 100% conversion efficiency won't give you full 24V...
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    Re: Novel leg/chassis design

    For linkage based walking robots, see also: https://www.youtube.com/user/psyclopz http://www.nidona.com/marauder.html
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    Re: Novel leg/chassis design

    Which is the undecided factor that goes in the square tube cutout in the actuated end of the linkages. My first thought for that was solenoid, then linear actuator (threaded rod coupled to a small...
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    Re: Power for eight (8) Dynamixel XM-430-W350-R

    batteryspace.com still sells plenty of LiFePO4 cells, and assorted e-bike sites sell them as well.

    The 'accurate positioning on a plane' bit says indoor with human interaction not outdoor speed...
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    Re: Power for eight (8) Dynamixel XM-430-W350-R

    bleh. I've been encountering lots of people not reading for comprehension recently... one in particular at work last week.

    jwatte, they mentioned in the very first sentences: four independently...
  14. Question(s) Re: U2D2 Power Hub and LIPO Battery 11.1V 1800mAh LB-012

    The problem is that battery uses a Deans / T-connector and the board does not have that anywhere on it. So, you need something like this (https://www.trossenrobotics.com/battery-wiring-harness) or...
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    Re: The Raspberry pi 4 Model B

    In theory, the RPi4+4GB is more powerful than my netbook in its default configuration (2-core 1.0GHz/1.33GHz, 4GB, USB2, Fast Ethernet, 802.11n)...

    Probably will pick up one of the RPi4+4GB in the...
  16. Thread: Rip Van Winkle

    by tician
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    2,336

    Re: Rip Van Winkle

    I almost posted before about this in one of the Malum IK threads, but that ODrive board brings the ick back to the surface...
    if you are not using BGA ICs with sensitive power requirements and/or ...
  17. Thread: Malum IK

    by tician
    Replies
    69
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    17,623

    Re: Malum IK

    How has your experience with MacroFab been? Spent an hour or so assembling some PCBs* for small scale production (Seeedstudio PCBs and stencils plus low-temp solder paste), but hand producing these...
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    Question(s) Re: AVRDUDE ERROR - arbotix board

    It is possible - although not probable - that the FTDI dongle you are using is not plugged into the arbotix correctly, or it is unable to provide enough power to the arbotix. Are the jumpers set...
  19. Question(s) Re: AX12-A not communicating after failed firmware recovery

    Usually, the reason for an AX-12 failing to move when not under significant weight loading is some sort of mechanical interference like cables getting wrapped around frames or wedged into gaps...
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    Re: Malum Gun Sub-thread

    So what you're saying is I really should put in a bit of effort into making this ~2"-OD x ~6"-L fully self-contained airsoft cannon holding ~320 BBs in a single-file ratcheting magazine with breech...
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    Re: Malum Gun Sub-thread

    Stop thinking rigidly and things will stop breaking.
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    Re: Malum Gun Sub-thread

    That thing is the essence of a one-way bearing: shaft/wiper spins one direction and it removes the roller/pin/BB from contact with the housing completely decoupling motion of shaft and housing;...
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    Re: Malum Gun Sub-thread

    Congrats, you just reinvented the one-way roller bearing. ;-) Hope your motor can handle repeated, sustained stalling.
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    Re: Malum Gun Sub-thread

    Only equivalent if the hopper is also rotating relative to the fixed wiper. Otherwise, the fixed 'wiper' is just a blockage helping keep BBs away from the hole/sprocket.

    Perhaps something like...
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    Re: Malum Gun Sub-thread

    Most of the designs I've pondered involve single-file magazines to completely eliminate the need for sorting BBs during combat as that has been the greatest source of issues people have been having...
  26. Question(s) Re: Do I have to unplug the balance connector from the loader before use ? (LiPo)

    Definitely need to know more about the balance charger you are using to say for certain, but...

    Does the balance connector even need to be disconnected when not charging? Probably not.

    Most...
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    Re: MX-64 bricked after update

    So they are 'bricked' in the sense that they cannot be upgraded, but work fine otherwise? That sounds entirely like a bootloader software issue. I know some persistent parameters were moved around in...
  28. Thread: Ax12/18 pid

    by tician
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    5,759

    Re: Ax12/18 pid

    Also this with AX-12/18 servos: https://www.youtube.com/watch?v=DVq8Vp798gg
    It is mostly the DARwIn-OP framework and gait engine, but with cheaper servos...
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    Sticky: Re: Introduce yourself!

    https://www.manualslib.com/products/White-Box-Pc-Bot-914-3875566.html and http://www.theoldrobots.com/OddsEnds2.html have many manuals, but no software.
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    Re: Dumb Idea: So like... what about jumpjets?

    ...nope. 8g NOX is not enough to lift a mech. Isp would be roughly 260~110[s] with 8:1 NOX:diesel mass ratio with chamber pressure dropping from ~900[psi] to ~30[psi] as the NOX is depleted from the...
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    Re: Dumb Idea: So like... what about jumpjets?

    oh, dear. Someone please save me. I'm giving serious thought to building a N2O+alcohol pressure-fed liquid rocket engine using 8g N2O chargers and a few mL of denatured alcohol, and throttled by a...
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    Re: Dumb Idea: So like... what about jumpjets?

    Dumber idea would be a true jump jet using a nitrous oxide cartridge in a throttled micro-scale monopropellant, hybrid, or liquid fuel rocket engine.
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    Re: Dynamixel MX-28 no longer turning

    Has the cable assembly to the first servo in the leg been damaged? If you plug the power/comm cable assembly into the spare connector on the other end of the leg, do any of the servos appear?
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    Re: Bioloid Premium Kit

    The comprehensive kit was discontinued many years ago and the Premium kit has gone through several revision/updates as well. There are no upgrade kits, but the individual parts are available from...
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    Project Re: More Mule then Rover?

    Yet airplanes still break apart more often than you would hope because stress fractures can be difficult to impossible to detect visually. They are detected/tracked during scheduled...
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    Project Re: More Mule then Rover?

    That's actually the rough process for determining tear-out limits for fasteners in holes, but it says nothing about the rest of the bracket surviving. Also, non-ferrous materials have finite...
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    Re: Puppet Master/ Slave setup

    How big is the puppet? Does it have to support its own weight at all times (free standing, bolted to a floor, hanging off wires, etc.)? Does it have to physically interact with other objects (lift a...
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    Re: Arbotix and RoboPlus

    The arbotix is not immediately compatible with any part of RoboPlus.

    The Xbee/FTDI UART of the arbotix does not talk directly to the dynamixel buss, so you have to program the arbotix to act as a...
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    Re: dynamixel issue demagnetize/magnetize?

    The vast majority of power supplies can regulate in only one direction (input to output) by limiting how much energy gets transferred from the input to the output. If anything pushes energy back onto...
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    Re: PhantomX + CM9.04 but no Xbee!

    The Phoenix code does not use NUKE or PyPose. Phoenix is a completely independent gait engine developed by several lynxmotion forum members for their hobby servo multi-leg robots and their...
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