Forum Posts

jcoahran
Dec 25, 2021
In Robot Builds
I'm experimenting with a couple of servo driven grippers for my AR3. The first is an open source project. It uses a Dynamixel MX-28AR servo and 3D printed parts. https://ieeexplore.ieee.org/document/7109102?arnumber=7109102 https://www.alaris.kz/research/open-source-3d-printed-underactuated-robotic-gripper/ The next is very basic. It also uses a Dynamixel MX-28AR, a couple frame parts from Robotis and 3D printed parts. I'm using a Dynamixel Shield for Arduino to drive the servos. I'm currently using this with an Arduino Due because the shield takes over the uart, and the second uart of the Due makes debugging the code easier. The Uno might work as well. I'll need to add a 12v source for the shield. https://www.robotis.us/dynamixel-shield/ Programming is fairly straight forward so far. I believe there are other Robotis servos that might be better suited for this application, but this is what I started with from the Alaris project. They are a bit pricey, but they are intellegent devices. I'm currently adding wiring to the AR3 to support these grippers. The AR3 has been such a rewarding project to learn from. I knew nothing about robotics before starting, and this has been a blast! Thanks so much to Chris for making this possible.
Servo Grippers content media
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jcoahran
Nov 30, 2021
In Questions
Hello, My AR3 has been working perfectly. Then one day, I clicked auto-calibrate, and the J4 axis just twisted around until the wires finally stopped it. It doesn't appear to have broken any wires. I can manually jog any of the axis's now, but when I try individual joint calibration, it moves a short distance and stops. The message says successful calibration. I have checked voltage at the limit switches, and all switches are +5v when made, but 0v when not made. My understanding is they should be -5v when not made. Any hints on where to start looking? Thanks! Joe
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jcoahran
Oct 05, 2021
In Questions
I 've built my AR3, and everything works perfectly. I don have on question about the ARCS. When I run it, the screen seems a bit off. See below. Some areas are under other parts of the screen (buttons, etc.). Any suggestions on how to fix this? Update: Ran the program on another PC. The display is formatted properly. The only major difference in the two PC is the graphics card. The one that works is an NVidia 2080ti. The one with issues is an NVidia 3090. Thanks, Joe
ARCS Software Screen Issue content media
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jcoahran
Sep 22, 2020
In General Discussion
Hello All, I'm taking my aluminum parts to be anodized. Are there any parts that should not be anodized? I have the option of Type II or Type III Hard Coat. Thoughts? Thanks, Joe
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jcoahran
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