What feature is common to both 2-point curvilinear and 2-point parallel grippers?

The correct response highlights that both 2-point curvilinear and 2-point parallel grippers are designed fundamentally for the purpose of grasping objects. This ability to grasp is a crucial function in robotic applications, allowing for the handling and manipulation of various items, whether they may be in industrial settings or more specialized tasks.

While it is true that they may also possess specific characteristics, such as pivot points and movement capabilities, the primary commonality lies in their core function. This aspect of both gripper types emphasizes their operational utility in a robotic system, where the ability to effectively grasp ensures tasks can be completed efficiently.

The other options introduce features that may not apply equally across both gripper types. For example, while movement in curves could be associated with curvilinear grippers, it is not a defining feature of parallel grippers. Similarly, the aspect of cost may vary significantly depending on specific designs and materials used, and the mention of dual pivot points does not accurately reflect the mechanism of a parallel gripper. Thus, focusing on the essential function of grasping highlights the shared use and primary purpose of both gripper types.