# Plastic Bottle and Aluminum can crusher

## Main Question or Discussion Point

I created a plastic bottle and aluminum can crusher. I researched and found out that my crusher should apply at least 175 lbf - 200lbf in order to crush the beverage container. My design idea is very similar to that of a cold rolling manufacturing process. Although I have research the cold rolling process and the calculations involved, I am still having trouble relating it to my design. As you can see from the attached image, the crusher will do a best effort attempt at crushing the article, if the force excedes that of the rollers then the springs attached (with a particular k value) will compress resulting in an increase in the gap between the rollers.

To clarify, my issues are...

Calculating the force of the drums on the can

Calculating the k value of the springs in order to allow them to only compress once the force of the rollers exceeds about 175 lbf

Calculating the torque needed out of a pair of DC motors in order to power the rollers

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