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Intro To Soft Robotics

Soft robotics is a branch of robotics that makes use of compliant (e.g. soft, stretchy, flexible) rather than rigid materials. These kinds of robots are particularly useful in applications involving people and other fragile objects, and they are of particular interest in medical robotics (including surgery, drug delivery and assistive robotics).

Often soft robots are based on biological organisms (which are themselves compliant), and make use of features such as artificial tendons, muscles and blood vessels.

Making Soft Robots at the CCI

Inflatable soft robots

Reference: Inflatable Robotic Project Examples

The classic image of the soft robotic 'tentacle' is made from cast stretchy rubber, with a chamber that guides airflow through a shaped internal structure. As air flows through the chamber, the shape causes the robot to bend in different directions.

We have a range of air pumps, syringes (for manual testing), tubing and valves to test inflatable robots.

For a guide on how to set up an air pump, please see the 5V Air Pump Guide.

Flat/Adhesive Inflatables

Coming Soon: How to make Heat Sealed Inflatables

Cast Inflatables

Workshop: How to make Cast Inflatables

If you're interested in using the silicone, you need to meet first with Alex and Rohit to discuss your project. We have some example moulds and tentacles in the hack space.

We have Ecoflex 00-30 and 00-50 Silicon Cure Rubber (00-50 is harder, 00-30 is softer and stretchier). This is a skin-safe silicon rubber that can be cast into 3D-printed moulds. It's also possible to make cast inflatables from other materials.

For instructions, please see ow to make a cast silicone inflatable.

Textile Robots

Workshop: Making a Knitted Actuator

It's also possible to fabricate robotic limbs using the knitting machine, using threads/wires woven into knitted fabric as tendons. CMU's Morphing Matter lab has a project on creating knitted actuators. We've not done much research into this here but want to develop it further, if you're interested come and chat to us.

Auxetic Materials, Origami and Kirigami

Reference:Coming Soon: Auxetic Materials Examples

There are a number of ways to change flat, rigid materials into surfaces with a variety of mechanical properties.

FormLabs 3d Printer

Coming soon!

Resources

The website Soft Robotics Toolkit was developed as part of an educational initiative by the Harvard Biodesign Lab, and has a huge amount of resources, design guides and learning materials for working with soft robotics. In particular, their OpenSCAD-based design tool

Research

If you're looking for inspiration in developing soft robotics, the following groups are all producing interesting research:

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