A ROS 2 robot arm you can actually afford
Six axes, a serial bus, one controller and a power supply sized for stall current. The parts list below is rebuilt from live stock on every visit, so it never points at a discontinued reference.
AdvancedTarget budget €700.00From €166.38 with the cheapest option at every step
1.Bus servos for the six axes× 6
Serial bus servos report their position, temperature and load back to the controller, which is what makes closed-loop control possible without adding encoders. Torque requirements fall off along the arm: the shoulder carries everything, the wrist carries the gripper. Size the first two joints on the fully extended arm with a payload, then step down.
Assembly
- Compute the shoulder torque as payload mass times full reach, then add the mass of the arm itself at half reach.
- Apply a factor of two on the result, because a stalled servo at its rated torque overheats within minutes.
- Keep every servo in the same family so they share one bus protocol and one voltage.
- Give each servo a distinct bus ID before mounting it, since the connector is unreachable once the arm is assembled.
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