## Fidget SpinnerBy: Kevin Puliti, Will Pinkow, and Matt Flicker

Our Problem statement

Brainstorming part

For our group, we brainstormed a lot of different things. We knew we wanted to use ball bearings instead of regular ones. We also wanted to make the spinner big so we would have a bigger centrifugal force.

The research

https://coggle.it/diagram/WNpJvzxbKwABElPJ

Our research part of the project was spent on Coggle. Here we decided what bearings we wanted to use and learned more about the weights.

Our rough sketch(design)

Our detailed sketch

Originally, we did have 4 arms for our spinner. But after our first prototype broke, we figured we would add an extra arm for it to spin longer.

Now, it was time for us to print our final prototype. This spinner was a difficult to make, but the final result was really worth it.

Our Final Prototype

This was the 3-D printer that we used for our spinner. It's called the maker bot and it is very accurate at printing things out in 3-D.

We decided to call him the star because of his 5 sides. This magnificent spinner has 15 ball bearings all together. Each arm has 3 ball bearing and they allow the spinner to spin even longer after it seems like it is slowing down. The star is heavy enough for it to spin for a long time. It weighs in at a tremendous 0.93 grams.

The Testing Portion

Our spinner was able to spin for a good amount of time. I think it was the best in the class too. It's best time was around 3:40 and that is pretty good. Our spinner always got over at least 2 minutes. Even when you thought it was gonna slowed down, the star would just keep going for about another minute or so.

Analyze

Is there a relationship between the weight and the time?

Yes, there is a relationship between the weight of the spinner and the amount of time it spins. If there is too much weight, then the arm can't make the spinner start moving. However, if there is not enough weight on the spinner, then the spinner will not be able to keep spinning for extended periods of time.

Is there a correlation between the number of spokes and time?

The number of spokes can have little or no effect on how long a spinner can spin. Rather, it is what is on the arms that makes the difference. If you were to give the spinner 20 arms, all of which with no weight on it, the spinner would not last for very long. However, if you were to make a spinner with 3 arms and .8 grams worth of weight on the arms in total and the weight is evenly distributed, then the spinner will last much longer. The number of arms of the spinner is much less important than the weight and balance of the spinner in general.

Is there a correlation between the height of the trial and the time?

One may think that there is a correlation between height of the trial and the amount of time the spinner will spin. However, that is not what we found during the testing process. We found that Tier 2, the middle tier, was the most consistently the longest as our spinner lasted 3 minutes on each spin. Tier 2 also had the longest spin, at 3 minutes and 40 seconds.

For my personal spinner, I decided to go with 3 regular bearings. I figured that the bearings and the spikes would pull down creating a more centrifugal force. This would allow the spinner to spin even longer. My spinner also has a good balance to it as well, so this also allows it to spin easier and longer.

I was lucky enough to be able to spin the spinner and I got a time of around 50 seconds. I was hoping for at least around a minute, but i'm happy with that time. The spinner is small and well weighed. It can fit anyone's hands and can be spun for enjoyment.

# Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.