Six-Axis Robot
A six-axis robot has six driven rotary joints to position and orient its tool freely anywhere in the work envelope. It is the default used-market arm.
A six-axis robot is an articulated arm with six rotary joints. Three axes (often called the major axes) position the wrist in space; the remaining three (the wrist axes) orient the tool, giving full six-degree-of-freedom control.
Six degrees of freedom mean the tool can reach a target from virtually any angle, which is essential for complex welding seams, spray paths, and assembly approaches. Fewer axes constrain orientation; more axes add reach-around flexibility.
Six-axis robots are the default choice across the secondary market. When evaluating a used unit, check that all six axes move smoothly through their full range and that no axis shows backlash or drift.