- #1
Hammad
- 22
- 1
Homework Statement
hi, I am designing a plastic bottle shredder machine, the mechanism looks like this roughly except that there are spur gears which enable the axles to rotate into each other. The axle on the left has 5 cutters which exert a total force of 1371.45 N in the given direction, this force is actually what i calculated the shear force of each cutter for a plastic bottle (PET material), and the total value of 1371.45 includes force exerted by the total weight of the blades at axle on the left. The right axle has 4 blades and total force plus weight is 1097.16 N. The curved arrow shows the direction of rotation of the respective axles.
i want to calculate the force and the torque required to move these two axles using a handle whose distance from centre of axle is 19.4 cm but the point of application of handle is 24 cm from the axle as well.
The maximum force which i have applied in the design is 400 N and a torque of 77.8 N m, it it sufficient to turn the axles for this design or not? actually i want to proof that it will require not more than 400 N to turn the handle and shred the plastic bottle.
i have not calculated the RPM, but it should be less than 60 as it is operated by a human, Horse power is also 1 or less as 1 HP is normally applied by an average human. The weight of the entire system is 40 Kg. the blades and the axle are made of stainless steel.
This is my system
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