Two-Finger Parallel Robot Gripper

This parallel gripper provides precise, repeatable object manipulation for robotic arms. The two-finger design offers excellent stability for cylindrical and rectangular objects while maintaining a compact footprint suitable for confined workspaces.

Unlike commercial grippers, this custom design optimizes for specific task requirements including grip force range, finger spacing, and mounting compatibility. The modular design allows easy finger replacement for different gripping tasks.

The gripper architecture uses a rack-and-pinion mechanism driven by a servo motor. As the pinion rotates, it drives two racks in opposite directions, creating parallel jaw motion. Linear guide rails (8mm diameter) ensure precise parallel alignment throughout the grip range (10-80mm opening).

The body structure is machined from 6061 aluminum for strength and lightweight construction. Gripper fingers are modular with threaded mounting points accepting custom jaw designs. Rubber padding on the standard fingers provides friction without marking delicate parts.

Key design features include force sensors in each finger for grip force feedback, an ISO 9409 mounting flange for universal robot arm compatibility, and cable management channels for clean integration. The gripper weighs 450g and can exert up to 50N grip force.

Finite element analysis validated structural integrity under maximum load conditions, with safety factor of 3x applied. All components were designed for CNC machining manufacturability with standard tooling.

The completed gripper demonstrated excellent performance in pick-and-place applications. Repeatability testing showed position accuracy within ±0.2mm over 1000 cycles. Grip force control proved consistent across the full range (5-50N) with force sensor feedback.

The gripper successfully handled diverse object geometries including cylindrical bottles, rectangular boxes, and irregular shaped components. Soft rubber fingers prevented surface damage on delicate items while maintaining secure grip.

Integration with a UFactory xArm required minimal modification, using standard ISO mounting. The gripper has been reliably used for 500+ hours of operation without mechanical failures. Future enhancements include electrically actuated fingers and integrated object detection sensors.