Shredder Drive: Difference between revisions

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=Calculations=
=Calculations=
*Largest force comparison- 15,000 in lb or 173 kg m.
*Largest force comparison- 15,000 in lb or 173 kg m. (1730 Nm) for the [[45.6 Cu In Hydraulic Motor]] that we use in [[LifeTrac]]
 
=Shredding Rate=
*Precious plastic shredder - what is shredding rate of precious plastic shredder? 3kw, 50kg/hr. [https://preciousplastic.com/starterkits/showcase/shredder.html]
*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 or 2 filament spools/day. This means. $1200 revenue/month if selling spools at $20/spool.
*This is a mere 5W. Use 100W - and get 10x-20x the production rate - of 20-40 spools/day. That is a potential business.


=First Order Shaft Torque Calculations=
=First Order Shaft Torque Calculations=
*1" shafts made of mild steel would break at 3000 ft lb of torque (ref?)
*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.  
*Minimum torque requirement 200 ft lb, or 28 kg m. This is 1/6 the strongest motor.
*[[Precious Plastic Shredder]] calls for 3 kg m from [[Lyman_Filament_Maker_Calculations#More]]
*[[Precious Plastic Shredder]] calls for 3 kg m from [[Lyman_Filament_Maker_Calculations#More]]. But that is old - and apparently not enough. The PP Pro shredder calls for 100 kg-m torque.


=Motor Torque=
=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]].
*[[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.
*Our goal is in between for now, 30 kg m. Reduction of only 30x to 100 RPM.


=Geardown=
=Geardown=
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*Serpentine belt on D=1.3" shaft of [[Treadmill Motor]]
*Serpentine belt on D=1.3" shaft of [[Treadmill Motor]]


==Gears==
=Motor Choices=
===Planetary Gears===
Try a treadmill motor (3kW) and a drill motor (100W).
*[[Planetary Gearbox]]
 
*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]. Not 30W. Appears to be 5W - [https://www.amazon.com/AUTOTOOLHOME-Electric-Drill-Motor-Drills/dp/B01LZYWFE4]
 
'''See [[Motor Selection Criteria]]'''
 
=Cost=
*Square tube - 3/8" wall - $27/foot. (1/2" wall weighs about 27 lb)
*Round tube, 5 mm wall (0.188") - $25/ft [http://www.metalbythefoot.com/]
*1" pipe, about $2.60 per foot (1.25 OD, 0.125 wall) - [http://www.metalbythefoot.com/]
*2" schedule 40 - $35 at Menards [https://www.menards.com/main/plumbing/pipe-fittings/black-pipe-fittings/threaded-black-steel-pipe-schedule-40/gs3410btbe/plumbing/pipe-fittings/black-pipe-fittings/threaded-black-steel-pipe-schedule-40/gs110btbe/plumbing/pipe-fittings/black-pipe-fittings/threaded-black-steel-pipe-schedule-40/gs210btbe/p-1444437590092.htm]


=Internal Links=
=Internal Links=
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*[[Open Source Shredder]]
*[[Open Source Shredder]]


=External Links=
*


[[Category:Shredder]] [[Category:Precious Plastic]]
[[Category:Shredder]] [[Category:Precious Plastic]]

Latest revision as of 22:23, 23 June 2020

Calculations

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 or 2 filament spools/day. This means. $1200 revenue/month if selling spools at $20/spool.
  • This is a mere 5W. Use 100W - and get 10x-20x the production rate - of 20-40 spools/day. That is a potential business.

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. This is 1/6 the strongest motor.
  • Precious Plastic Shredder calls for 3 kg m from Lyman_Filament_Maker_Calculations#More. But that is old - and apparently not enough. The PP Pro shredder calls for 100 kg-m torque.

Motor Torque

Geardown

Belt Geardown

Motor Choices

Try a treadmill motor (3kW) and a drill motor (100W).

  • 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]

See Motor Selection Criteria

Cost

  • Square tube - 3/8" wall - $27/foot. (1/2" wall weighs about 27 lb)
  • Round tube, 5 mm wall (0.188") - $25/ft [6]
  • 1" pipe, about $2.60 per foot (1.25 OD, 0.125 wall) - [7]
  • 2" schedule 40 - $35 at Menards [8]

Internal Links

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