Shredder Drive
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Calculations
- Largest force comparison- 15,000 in lb or 173 kg m.
Shredding Rate
- Precious plastic shredder - what is shredding rate of precious plastic shredder? 3kw, 50kg/hr. [1]
- By comparison, we have 5W steppers. Minebea_Stepper_Motor_Specs
- This allows us for 3000/5=600x less throughput. This means that for 12 hour run time, we get 1 kg of shred.
- This is minimal, but doable for production.
First Order Shaft Torque Calculations
- 1" shafts made of mild steel would break at 3000 ft lb of torque (ref?)
- Minimum torque requirement 200 ft lb, or 28 kg m.
- Precious Plastic Shredder calls for 3 kg m from Lyman_Filament_Maker_Calculations#More
Motor Torque
- Motor Torque Calculator says about 1 kg m for 3000 rpm with 3kW drive as in Treadmill Motor. Compare to 173 kg m for strongest torque relevant to tractor drive as in 15000 In Lb Motors.
- Our goal is in between for now, 30 kg m.
Geardown
Belt Geardown
- Serpentine belt on D=1.3" shaft of Treadmill Motor
Gears
Planetary Gears
Motor Choices
- Brushed motor is 75-80% efficient. [2]
- We can try a small DC motor, 30W. This yields a theoretical 12 kg per 12 hour day grind rate, which is just about correct. [3]
- Ex. JYCRS390H - [4]. Not 30W. Appears to be 5W - [5]