Which Robot configuration represent a human arm?

Explanation:

Jointed arm configuration:

• Articulated/joint arm – 3 rotary

• The arm in these configuration robots looks almost like a human arm.
• It gets three rotary joints and three wrist axes, which form into six degrees of freedom.
• As a result, it has the capability to be controlled at any adjustments in the workspace.
• These types of robots are used for performing several operations like spray painting, spot welding, arc welding, and more.

Advantages:

• Increased flexibility,
• Huge work volume, and
• Quick operation.

Polar configuration robots:

• Polar/Spherical – 1 linear, 2 rotary Joints

• The polar configuration robots will possess an arm, which can move up and down.
• It comprises a rotational base along with a pivot.
• It has one linear & two rotary joints that allow the robot to operate in a spherical work volume.
• It is also stated as Spherical Coordinate Robots.​

​Advantage:

• Long reach capability in the horizontal position.

Disadvantage: 

• Vertical reach is low.

Cylindrical Configuration:

• This kind of robot incorporates a slide in the horizontal position and a column in the vertical position. It also includes a robot arm at the end of the slide. Here, the slide is capable of moving in an up & down motion with the help of the column. In addition, it can reach the workspace in a rotary movement like a cylinder.
• Cylindrical – 2 linear, 1 rotary

Advantages:

• Increased rigidity, and
• The capacity of carrying high payloads.

Disadvantages:

• Floor space required is more, and
• Less work volume.