The Design and Fabrication of a Soft Robotic Hand

Once upon a time, in the realm of Soft Robotics, engineers embarked on a journey to create an articulated robotic hand that seamlessly combined the elegance of human hand essentials with the practicality of reliable manufacturing.

The result? A harmonious fusion of soft and rigid components, mirroring the biological principles of a human hand but tailored for the intricate world of robotics.

Unveiling the Symphony of Soft and Rigid Components

Unveiling the Symphony of Soft and Rigid Components

In the world of soft robotics, the creation of a robotic hand involves a careful dance between various components, each playing a crucial role in mimicking the capabilities of the human hand.

Let’s take a closer look at this ensemble:

  • Skeletal Structure: Just like human bones provide support and movement, the robotic hand features a skeletal structure, creating a load-bearing framework.
  • Joints and Flexibility: Joints in the robotic hand provide flexibility, allowing for rotations and fluid human-like gestures, mirroring the capabilities of the human hand.
  • Actuators and Tendons: Actuators act as the hand’s muscles, causing force, while tendons connect the actuators to the bones, enabling finger movement and manipulation.
  • Ligaments for Dexterity: Ligaments interconnect bones, mimicking the human musculoskeletal system and enhancing the hand’s dexterity and manipulation skills.

Navigating Design Choices

Navigating Design Choices

In the realm of soft robotic hand design, engineers face critical decisions to achieve optimal functionality while avoiding unnecessary imitation of nature.

Considerations include:

  • Degrees of Freedom: Balancing dexterity against complexity, cost, and weight is crucial when deciding on the number of degrees of freedom.
  • Finger Count and Thumb Design: Mimicking human-like interactions involves careful consideration of finger count and thumb design, as seen in Kadkowski’s and Fakes’s grasp taxonomy.
  • Joint Mechanisms: Choosing between pin joints, flexure joints, synovial joints, and rolling contact joints influences the hand’s movement and compliance.

Joint Mechanisms: Bringing Life to the Robotic Hand

Joint Mechanisms: Bringing Life to the Robotic Hand

Understanding joint mechanisms is key to bringing the robotic hand to life. From traditional pin joints with rotational motion to elastic flexure joints, synovial joints inspired by the human body, and rolling contact joints, each design has its advantages and considerations.

  • Fabrication Methods: The fabrication methods for these joints vary, from traditional machining to 3D printing, depending on batch size and material requirements.

Actuation and Powering the Robotic Hand

Actuation and Powering the Robotic Hand

Actuation is the heartbeat of dynamic robotics. Tendon-driven mechanisms rely on either electric motors or artificial muscles.

Servo motors provide precision and control, while artificial muscles, like fluid elastomer or electro-hydraulic actuators, offer unique advantages.

The Outer Layer: Crafting the Skin

The Outer Layer: Crafting the Skin

The outer layer, the skin, serves as a protective shield for delicate mechanics, enhances friction, and offers potential for sensing.

Design choices for the skin depend on the hand’s purpose, with options ranging from ready-made gloves to durable plastics and silicon, and even 3D-printed customization.

  • Sensor Integration: Sensors elevate the hand’s capabilities, measuring precise finger angles, detecting tactile feedback, and monitoring actuator performance.

Conclusion: A Symphony of Soft Robotics

Crafting a functional and dexterous soft robotic hand demands meticulous consideration of components and design choices. By emulating the principles of the human hand and adapting them for a robotic context, engineers unlock the potential for a versatile and capable creation.

As we delve into this realm of innovation, the question arises: What new frontiers will soft robotics explore next?

Put your parts into production today

Content in this article

Request A Quote

*We respect your confidentiality and all information are protected.