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hero
17/05/2016 at 03:32
0

Welcome @tyoolip 😀

hero
17/05/2016 at 03:21
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Both plastics can be recycled, but you would need to experiment with melting both kinds of plastics to see how the final product could behave.

Here are a few resources:

EVA melting point: 250°F (96°C)

Rubber melting point: 356°F (180°C) or 750°F~1000°F if it’s tires/vulcanized rubber When you melt rubber, it “Devulcanizes“, which means it loses elasticity and will need to be vulcanized again depending on what you want to do with the final rubber product. Also, melting vulcanized rubber releases toxic gases that are highly contaminant for the environment, and can affect your health if you breath the fumes.

In reply to: Who needs a shredder?

hero
17/05/2016 at 03:07
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Looking forward to hear back from you 😀

hero
16/05/2016 at 20:52
1

Another idea:

Once the water used to wash your plastic get’s dirty, you can clean it first with a thin mesh to remove any solids, and then evaporate and condensate the water to make it clean again. Building an evaporator should not be complicated or costly. You just need to add a resistor on one of your recipients (the one with dirty water) to heat the water and start the evaporation process, and then a tube that transports and cools down that vapor to be deposited into another container.

hero
16/05/2016 at 19:24
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@cotrini7 disculpa la respuesta tardía. Preferiblemente debes usar un motor monofásico. Los motores monofásicos pueden ser conectados a las tomas eléctricas de 110v o 220v de las casas, mientras que un motor trifásico requiere de una instalación eléctrica especial que normalmente solo se encuentra en talleres de electromecánica.

In reply to: Making the Shredder

hero
16/05/2016 at 19:10
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@drillbit Look at Timmy’s reply on this thread

Looking for a machine builder or CNC cutter for Shredder – Saint Paul, MN

hero
16/05/2016 at 19:00
1

Yes, some plastics release gases that are not deadly, but irritant for your eyes. I would be more concerned about how clean is your plastic, and not how toxic it might be. For instance, I would not eat from a plate/cup/spoon made with recycled bottles that you got from a sewer.

Plastics only release gases (contaminants) when they are heated, and not all plastics release such gases. Once the plastic cools down, it is safe to be used for food consumption. Just as a security measure, you might want to clean your final plastic products with a mix of isopropyl alcohol + water + 1 drop of chlorine, to make sure they are as sterile as possible.

hero
16/05/2016 at 17:52
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The bigger pieces will continue to rotate inside of the shredder until they are small enough to pass through the mesh

hero
13/05/2016 at 00:47
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@cadena Look at Timmy’s reply on this thread

Looking for a machine builder or CNC cutter for Shredder – Saint Paul, MN

hero
13/05/2016 at 00:46
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Look at those colors <3

hero
13/05/2016 at 00:33
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One way would be to use an Oven to melt the plastic into a thin sheet, wait for it to cooldown, then crack it with a hammer, and shred it again.

hero
13/05/2016 at 00:32
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Here’s an idea. Pour some concrete in a wooden or plastic box, then cover it with a plastic bag or a sheet of thin plastic. Rub your door knob with oil or grease and then insert half of the door knob, over the plastic covered concrete. Finally, pour more concrete to cover the top half of the door knob. Once the concrete is dry, you can take the top “concrete mold” part, remove your door knob, fill any holes in the concrete to make the interior smooth, and there you have it.

The end result should look somewhat like this:

Attachments:

In reply to: Shredder motor

hero
13/05/2016 at 00:24
3

Just fyi, normally, the worm gearbox (Motor reductor) costs more than the motor itself. You will not find a motor with less than 1000rpm in the market, so you will need to buy a reductor, or buy a motor with the reductor preinstalled, or build your own reductor with pulley belts like this one:

hero
13/05/2016 at 00:21
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@godpepper just to give you an idea, I spent $300 in the motor with a reductor, plus $400 for the laser cutted parts, plus the cost of making the frame either in Wood or Metal. The only way a project like this could be affordable, is if you have access to scrapyards (which are virtually non-existent in Costa Rica) 😉

In reply to: samples

hero
13/05/2016 at 00:15
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I believe you can look at what other people are creating in the “Share your plastic creations” subforum and ask them directly 😉

hero
12/05/2016 at 20:44
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I saw this post a few weeks ago and was hoping that someone would provide an answer, but it looks like no one else has experimented with different motors.
The basic requirements of the motor are:
*Needs to be strong
*Needs to be slow

In my personal opinion, “Strong” means 1/4HP or more. A washing machine motor usually has 1/4 horse power

Next question, once you have the motor, how can you make it go slow?
The only answer to this is either getting a reductor and adapting it to your motor, or building your own reductor with a pulleys system, like these guys did:

Pulleys RPM calculator: http://www.blocklayer.com/pulley-belteng.aspx

I decided to just go ahead and buy a 1/2hp motor that already comes with it’s own reductor, like the one Dave used on his Shredder video. It wasn’t cheap (almost $300 motor + reductor), but it was the less painful way to get the motor I needed

hero
11/05/2016 at 20:59
2

I’m from Costa Rica and I’m building the Shredder and the Extruder. I’m not a metal worker and don’t have any machines to help you myself, but I can share all I have learned and researched so far.

My email is: [email protected]

Just as a heads-up, as you probably know already, Costa Rica is an expensive place to buy pretty much anything. So if you are thinking about making a Shredder, the costs involved will probably be the same as buying a professional shredder in US and shipping it by Sea to Costa Rica. I requested a quotation of the Shredder blades to a plasma cutting company in San Jose named “CEC” http://plasmacut.cr, and just those metal parts would cost me $500 plus another ~$350 for the motor with reductor, plus the costs of building the frame.

For the other machines (Filament extruder, compresion, injection) you can buy many of the parts in any local hardware store like “EPA” or “El Lagar”, and any parts you can’t find here, you can get them from Amazon and ship them to Costa Rica with http://smartcouriercr.com/ or any other PO BOX Company.

hero
11/05/2016 at 20:48
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It’s simple. A round Tube with this measures 34x26x4MM means that it has a thickness of 4mm, the external diameter is 34mm and the internal diameter is 26mm

A = 34mm
B = 26mm
C = 4mm

The dimensions doesn’t have to be exact, but make sure that the drill fits perfectly inside of the tube, which means that the Internal dimension (B) is the most important to consider.

hero
08/05/2016 at 20:36
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@timmy I’m interested, just sent you an email.

hero
08/05/2016 at 07:45
4

I would suggest building a “Solar Oven”, it’s a very old idea with lots of available designs that you could use for your project.

You could build a Solar Oven like this one https://www.youtube.com/watch?v=4qN27f7zO2M&ab_channel=comuntierra and then make a mold to melt your plastic in the oven in the form of “plastic bricks”.

You might just need to shred the plastic, put it in the “brick” mold, place it in the solar oven, and then just wait for the sun to do its thing.

The bricks could be melted in the form of giant Legos, or using these guys idea:

hero
08/05/2016 at 07:36
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I believe that kind of motors are hard to find from salvage/junk yards, you might consider using car starters, washing machine motors, but not sure if they would work.

hero
08/05/2016 at 07:28
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The .dxf files were already uploaded on this forum on another thread, you can find them attached here for your convenience. If you find someone to cut the parts for you, please let me know, I need to get someone to make them for me as well.

Attachments:
  1. Dxf-laser-1.zip

In reply to: Machine in USA

hero
06/05/2016 at 20:32
0

@santybarrios yes, you just need to sent .dxf files (attached here) to a laser cutting company. The file names specify the thickness of the inox steel needed, and the amount of pieces needed of each one.

If you find someone to cut the pieces for you please let me know and we might place 2 orders, I have been trying to find a laser cutting company in florida but none of them are responding my emails

Attachments:
  1. Dxf-laser.zip
hero
06/05/2016 at 19:58
0

By the way. I was able to find a laser cutting company in Costa Rica, but they charge almost $500 for cutting all the parts on Inox Steel. I’m now looking for a cheaper alternative in Florida but haven’t had any luck yet.

I also contacted about 10 recycling centers and none of them sell resins (shredded plastic) or pellets, so I’ll have to find a way to shred my own plastic until I can afford to make the shredder. A kitchen blender perhaps?

hero
06/05/2016 at 19:54
0

Pura vida 😉

hero
06/05/2016 at 19:54
0

I’m looking for the same, I have emailed at least 10 Laser Cutting companies in Florida but haven’t got 1 simple reply.

In reply to: Read before you help

hero
28/04/2016 at 10:49
0

Sorry for the late response, I just joined this forum today 😉
Your motor looks perfect, but 1730RPM is way too fast. You might need to add a reductor on your motor to reduce the RPM to aproximately 60~70RPM

Viewing 28 replies - 1,141 through 1,168 (of 1,168 total)