$ cat projects/gripper.md

The Challenge

Traditional robotic grippers lack the ability to dynamically adjust their stiffness during physical operation. This significantly limits their versatility and safety when handling objects of varying fragility, stiffness, and shape. To solve this, we needed to design a modular variable stiffness system that could provide real-time stiffness control during live operations.

The Solution

Designed and built a modular version of a variable stiffness magnetic gripper system featuring:

• Magnetic Actuation: Enables continuous, smooth stiffness adjustments across the full operational range
• Modular Design: Quick-change finger mechanism for easy structural reconfiguration in under 5 minutes
• Real-time HMI Interface: Integrated a Raspberry Pi-powered touch display interface for live operator control and feedback
• Software Architecture: Developed the control and communication framework using ROS, C++, and Python for seamless robot arm integration

Results & Impact

• Successfully patented the variable stiffness mechanism via the HILS Lab
• Demonstrated continuous stiffness adjustment, enabling the robot to grasp delicate items (such as fruits) and rigid metal components alike without damage
• Maintained control loop execution latency under 10ms
• Proven reliability across over 1,000+ grasp cycles during validation testing