Data Set for Snapping Shrimp Mechanical Device
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abstract
How to build and operate your own snapping shrimp device: The bio-inspired snapping shrimp device is relatively easy to build. This is useful both for reproducibility of the science as well as being interesting and fun. We believe with appropriate supervision and less than $100 people of age 12 and up could complete reproduction of the device. Reproducing the data would require more costly instrumentation. A Solidworks assembly and parts CAD files for the bio-inspired device and the mesh files of the 3D scanned snapper claw is available at this OAKTrust entry. The dactyl plunger, propus socket and clutch can be ordered from Shapeways or printed with any similar high fidelity 3D printer. A proper and complete fit of the plunger into the socket might require multiple insertions and slight polishing of the plunger depending on the print quality. Torsion springs are necessary to power the device. McMaster part numbers for the springs used in this article are 9271K31 (left-hand) and 9271K29 (right-hand). Other parts can also be acquired through McMaster website using the part number listed in the CAD assembly file. The base and two lateral parts can either be machined or 3D printed and appropriate stainless steel rod for clutch shaft and plastic rod for clutch release. Once assembled the operation is relatively simple. First submerge the device, then open the claw plunger by pulling back with finger and lower clutch into place so plastic rod holds the plunger in position. The device is now cocked and ready to fire. Of note, do not allow the device to snap shut in air as this can easily damage the device. Use a string tied to the clutch and tug on it to initiate the clutch release. The claw will rapidly close. To a human observer the snap and cavitation oscillation is too fast to see about 10,000 fps video is required. The light emission is too dim to see with an unaided eye. The shock wave from the cavitation collapse is a loud snapping noise. Item list: 1. Mesh files on snapping shrimp claw morphology. 2. CAD design. 3. Schlieren imaging of the underwater shock wave generated by the bio-inspired device. 4. ICCD images and oscilloscope data for saline water with air doping. 5. Supplementary material data for distilled water with air or argon doping. 6. Movie raw data.
