A robot described as six-axis has how many joints contributing to movement?

• A. Six
• B. Four
• C. Three
• D. Eight

Answer: (A)

Six-axis describes a robot arm that has six joints (axes) that contribute to motion. Each axis adds one degree of freedom, so the arm can both reach and orient its end effector in three-dimensional space. In a common six-axis configuration, the joints are at the base rotation, shoulder, elbow, and three wrist joints (pitch, yaw, and roll), giving six independent movements. Therefore, the number of joints contributing to movement is six. If there were fewer joints, the arm would have limited reach or orientation; more joints would describe a different, nonstandard setup.