How many joints does a robotic arm*** have?

3~7 or so. The robotic arm consists of several joints and motion axes, each of which has a different mode of movement and limitations. Usually, the number of joints in a robot arm is around 3~7. The number of joints depends on the design and purpose of the robot arm. The following are the joint compositions of several common robotic arms:

1.3 Degree of Freedom Geometry: It consists of 3 rotary joints, each of which rotates around a different axis, allowing motion in 3 directions.

2. SCARA type robotic arm: composed of 3 or 4 joints, i.e. 1 rotary joint and 2 or 3 translational joints, which can realize a variety of motions, such as horizontal translation, vertical up and down, rotation and telescoping.

3. 6-axis robotic arm: It consists of 6 joints, i.e., 1 rotary joint and 2 or 3 translational joints, which can realize 6 degree of freedom movements, and the robotic arm has the ability to rotate and telescope in the X, Y, and Z directions respectively.