Hollow Ball For Egg's Protection

grabcad

This entry for the challenge features a hollow ball with a threaded cover, adjustable via an axial direction mechanism, housing an egg. The trampoline principle inspired spring elements like cup springs to hold the egg in place centrally while two separate rings of spring element rings serve as elastic fixation in radial direction, similar to a cage. The outer ball housing diameter is 100mm and has a wall thickness of 3mm. Spring elements measure 1mm thick. Seishiro Okazaki's egg model is used. To use the device, insert the egg in a predefined position before closing the hollow ball with the threaded cover. ABS is preferred for 3D printing, though the user lacks access to a printer for testing. The assembly can be tested at a bowling alley or against a wall from a specified distance and velocity. Technical details include an impact velocity of 9471m/s after a 4572m fall, ABS density (1.04g/cm3) for mass calculation, assembly volume (106.86cm3), mass without egg (0.111kg), and potential energy without egg (4.9J). Spring elements aren't calculated or analyzed using FEM. The STEP file, STL files for 3D printing, native data in PTC Creo Parametric 2.0, and the model are available.