The most common gripper configuration is which?

The most common gripper configuration is which?

• A. Curvilinear
• B. Three-point
• C. Two-point Parallel
• D. Magnetic

Answer: (C)

The main idea here is how the gripper’s contact arrangement affects stability, repeatability, and versatility in picking up parts. A two-point parallel gripper uses two jaws that close in a parallel fashion, creating a symmetric, stable grasp. This arrangement yields highly repeatable finger spacing and straightforward alignment with the part, which minimizes tilting and rotational errors during pick-and-place. The simplicity of the mechanism—two parallel-moving jaws driven by a single actuator (or synchronized actuators)—also makes it affordable, robust, and easy to integrate with sensors for feedback. That combination of reliability, precision, and broad applicability is why two-point parallel grippers are the most common in automation. Curvilinear grippers, with jaws shaped to follow curved surfaces, are useful for specific curved or irregular shapes but don’t offer the universal, straightforward grip that parallel jaws provide. Magnetic grippers work well with ferromagnetic parts and can be fast, but they’re limited to magnetic materials and can leave residue or require additional handling when dealing with non-magnetic parts. Three-point or multi-finger grippers can accommodate more complex or irregular shapes, but their added complexity, slower cycling, and tighter tolerances often reduce general-purpose versatility and cost-effectiveness compared to the simple, dependable two-point parallel design.

The main idea here is how the gripper’s contact arrangement affects stability, repeatability, and versatility in picking up parts. A two-point parallel gripper uses two jaws that close in a parallel fashion, creating a symmetric, stable grasp. This arrangement yields highly repeatable finger spacing and straightforward alignment with the part, which minimizes tilting and rotational errors during pick-and-place. The simplicity of the mechanism—two parallel-moving jaws driven by a single actuator (or synchronized actuators)—also makes it affordable, robust, and easy to integrate with sensors for feedback. That combination of reliability, precision, and broad applicability is why two-point parallel grippers are the most common in automation.

Curvilinear grippers, with jaws shaped to follow curved surfaces, are useful for specific curved or irregular shapes but don’t offer the universal, straightforward grip that parallel jaws provide. Magnetic grippers work well with ferromagnetic parts and can be fast, but they’re limited to magnetic materials and can leave residue or require additional handling when dealing with non-magnetic parts. Three-point or multi-finger grippers can accommodate more complex or irregular shapes, but their added complexity, slower cycling, and tighter tolerances often reduce general-purpose versatility and cost-effectiveness compared to the simple, dependable two-point parallel design.