When we set out to look at developing ZewParts LLC, we needed an idea to launch the site. As soon as the need was created a solution arrived. Walking into the garage of a friend's house, we saw her ten year old son carving a small piece of wood into a two inch long and one inch wide block. With a skate bearing on each side and in the center it immediately caught my eye. As they explained the new market of fidget spinners I offered to build one on the 3D printer for him. Little did I understand what a crazy market would evolve around these little spinning toys in just the weeks to come.
With the primary creation of ZewParts LLC, to simply put fun ideas out there we discover at Zewski Corporation for all to see, I came back to my office that weekend and modeled up a spinner, printed a few and handed them around - including back to our friend's son.
Our first item took two months of spare time to perfect. Experimenting on the 3D printers trying both FDM and PolyJet designs. Initially we had several crack due to the tension on the printed material, which allows for fast turn around of unique designs, but has less than half the strength of convention injection molded design (not to mention the printed materials are more than 150x the cost of injection molded plastic).
Eventually, the bladed spinner was what we came up with. It is slightly smaller in diameter than the typical Amazon purchased spinners, which allows it to fit in a small child's hand more easily. Th spinner has 12 .045 inch thick louvered blades that generate airflow as the spinner spins, a "cool" effect with a non-cool side effect.
In line with Newton's First Law of Motion, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force and Third Law of Motion, when one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body. In generating the air flow the air passing through the blades acts as an opposing force to the momentum of the spin, slowing the spinner down at a deceleration equal to the force apply by the air passing across the blades.
Although we were able to successfully create a spinner with a ceramic bearing that would spin for almost two minutes, when we added the blades, the time of spin was greatly reduced to less than a minute. However, the bladed spinner can spin indefinitely if you are willing to blow in the blades like a pin wheel (happy face).