Revision as of 22:00, 28 May 2020

Calculations

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.

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 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.

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]

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 =Motor Choices=
-*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.
+*Brushed motor is 75-80% efficient. [https://www.google.com/search?q=efficiency+of+brushed+motor&oq=efficiency+of+brushed+motor&aqs=chrome..69i57.4377j0j7&client=ubuntu&sourceid=chrome&ie=UTF-8]
+*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. [https://www.amazon.com/AUTOTOOLHOME-Torque-Traxxas-Wheels-Electric/dp/B01M58POHF/ref=psdc_306577011_t1_B01L6EKGGQ]
+*Ex. JYCRS390H -  [https://www.amazon.com/AUTOTOOLHOME-Torque-Traxxas-Wheels-Electric/dp/B01M58POHF/ref=psdc_306577011_t1_B01L6EKGGQ]
 =Internal Links=