Shredder Drive

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

• Planetary Gearbox

Internal Links

• Precious Plastic Shredder
• Open Source Shredder