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My first precious plastic machine!

This topic contains 21 replies, has 5 voices, and was last updated by  Olivier 3 months ago.

1
William Petersen vipermedic69

My first precious plastic machine!

10/06/2018 at 01:10

Hello from the Pacific Northwest (USA). I am excited as heck to show off my first machine my wife, brother and I made! With the help of Precious Plastic USA (Based out of Portland, OR) we were able to construct our shredder! We were lucky enough to get our hands on an old school art desk, and an ATV winch from Harbor Freight. We are using a belt drive system from an old car 12V battery set up on a constant flow charger until we can afford a converter to 110.

UPDATE: We ordered a pulley for the belt drive but it didn’t produce enough torque. We have a chain and sprockets coming by the end of the week. We also reversed the sides to where the larger one is on the shredder, and the smaller one is on the winch itself. Wish us luck!

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new
11/06/2018 at 20:23
2

Awesome! Keep it up! Best wishes from up the coast in AK!

starter
12/07/2018 at 21:21
3

ITS ALIVE!!! I finally got’er done!! Using a ATV Badlands 2500 winch, a 428 size chain, and a sprockets sized for torque. Unfortunately its slow AF, but it gets the job done! The hopper was just thrown together as a temporary fix until we build a good one.

 

 

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starter
12/07/2018 at 21:29
2

Special Thanks to Precious Plastic USA @justinc for the shredder components.

warrior
12/07/2018 at 22:36
2

That’s awesome @vipermedic69, congratulations
How well does it shred?

starter
13/07/2018 at 04:21
1

@xxxolivierxxx Its okay. There is some skipping in the chain when it reaches something it cant handle. The ATV winch is not made to run continuously so we have to grind up in small spurts. We just decided its best to grind it without the screen on the bottom, then toss that inside it again with the screen to refine it a little more.

 

Our plans are to get an electric motor from Harbor Freight and a worm gearbox from ebay and directly hook it up instead of the chain. Unfortunately where we sit financially we have to wait for some extra cash from pay checks to come around.

13/07/2018 at 13:44
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I am also interested to see more shredding videos (using PET, HDPE,…) of this build since this could be a cheap solution compared to a proper 500 $ reducer needed actually. I toyed around with making sprockets and old motor bike chain, it’s impressive force it can withstand.

starter
17/07/2018 at 17:40
1

Sad day(s). So as shown in the previous video the gears with chain was working okay. Unfortunately the winch gear stripped out the winch pulley. So we decided to go straight from the winch to a coupler, to the shaft like so

After drilling though hardened steel for several hours in order to put in a set screw we thought we were good to go, and then this happened….

 

 

 

Who would have thought shredder torque could break hardened steel

starter
17/07/2018 at 17:44
1

Currently we are ‘dead in the water’ until we can get funds to buy another motor, and gearbox. Seeing how we are self funded for the most part its probably  going to be a while.

 

We are thinking a small 3hp electric motor with a 50:1 worm gearbox.

 

The motor:

https://www.harborfreight.com/engines-generators/electric-motors/3-hp-compressor-duty-motor-68302.html

Any input would be helpful

warrior
17/07/2018 at 18:01
2

@vipermedic I think you will have a difficult time finding a gear box for that 3600RPM motor, most gear boxes are designed for max 1750rpm input.

17/07/2018 at 18:35
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@vipermedic,
no, you won’t have much or long fun with that. here some reference data: 5hp, 20:1 reducer (500$+) and an inverter for 4kw is what you want ! such drive setup pushes you in the 800-1200$ ballpark (couplers not included yet). if you go lower, you will have the consequences (jamming,…)! so all i can recommend : skip all that low-power stuff and do it right from the beginning 🙂 here my last shredder as reference.
there is an incredible torque needed for some plastic, no way you do this below 3 or 4 Hp.

17/07/2018 at 19:31
1

@vipermedic69, if i’d be you, i would ask your next machinist metal shop. these guys usally have lots of spare motors and reducers and if not, they gonna tell where to get it. just as reference: a 4k motor is sold here on a kg base, 25 kg = 70 euro. if you pay more then something is odd.

starter
17/07/2018 at 20:31
1

I got my hands on a SEW EURODRIVE WF20DT71K4-KS SEVERE DUTY MOTOR.

https://www.nriparts.com/item/sew-eurodrive-wf20dt71k4-14hp-230460v-ac-170023rpm-3ph-ac-gear-73911-electric-motor/382557

warrior
17/07/2018 at 20:59
3

@vipermedic69 That’s a 0.25hp motor, at 52RPM it will give you close to 34.23N.m of torque. Not good for the shredder, and even a extruder will have a hard time with that motor.

17/07/2018 at 21:57
2

well, to me they are all way too weak, and partly overpriced. that’s why, get in your car, drive to the next industrial area and ask a real machine shop. spend max. 80$ on a min. 3.5 kw motor, as said. reducer is the more expensive part

be careful with the reducer, there is nothing really good under 300$. if you go below, it’s a matter of time it wears out. also, expect at least 150-200 $ for an inverter.

sorry also to see you in trouble with all that, you will have to understand sooner or later that the pp machines are rather for hobbyist and also have very tough limitations; Dave’s exposed prices are just 20% of what the shredder actually needs.

so again: buy nice, not twice ! cutting corners here isn’t possible, its INDUSTRIAL equipment!

starter
26/07/2018 at 17:48
1

If power is used on both sides of the shredder axle (vs most designs that have 1 side), will this add to, or multiply the shredding ability/power?

starter
26/07/2018 at 17:56
1

example

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helper
26/07/2018 at 18:53
2

@vipermedic69 you will have the same torque as with one chain, the only thing you can trade is torque versus rpm by changing the sprocket size on either side.
A 250 w motor has a (theoretical) torque of nearly 300 Nm ……. at 8 rpm.
http://www.wentec.com/unipower/calculators/power_torque.asp

starter
26/07/2018 at 23:25
1

Question about gearboxes

 

Lets say you have a gearbox is rated something like 1400 and you got an engine that runs at 1800. What could potentially happen? Would that destroy it? or simply mess up the gear ratio equation?

warrior
27/07/2018 at 06:15
1

@vipermedic69 400rpm should not represent too much of a difference on the gearbox, it is not recommended but it should work fine. If you had a 1400rpm gearbox and a 3600rpm motor then It would be a NO-NO

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