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Viewing 30 results - 1 through 30 (of 2,220 total)
  • In reply to: Shredder efficiency


    hi Kamel nice work from you, and we really appreciate your efforts on documenting the shredding process, well i have test your motors and torque details on the ( will it shred doc ) and the result looks so clear that the shredder will jam little bit, this why we are alimenting our shredder with a 3kw motor and we will put the documentation about very soon. wish y all the best luck


    Hi team,
    I finally bought a motor.
    Got this one  : https://www.motorcontrolwarehouse.co.uk/tec-worm-gearmotor-2-2kw-20-to-1-1.html

    It has a 35mm output shaft with keyway and I’m wondering how to connect it to the shredder shaft.
    Is it a good idea to turn the 35mm shaft down to 20mm and buy a 20mm coupling bit?
    Or should I try and manufacture myself a 35mm to 20mm coupling?
    Thank you for your answers

    In reply to: Shredder efficiency


    hello dears,
    thank you for your replies, i tested the shreeder yesterday afternoon, in fact it has nothing to do with the motor, the problem was the blades ( it got rounded ) i had to sharp those blade to 60° angle.
    i didn’t got time to reassemble everything.
    those blades are made of normal and non stainless steel, i am thinking to use those ones to their max than switch to hardox knifes.
    i will keep you guys informed with the future results
    Best regards and thanks again.
    ps: i have no pictures because yesterday i got engin grease all over my hands


    Just make sure that the motor stalls out before your shredder fails.


    Is that a good thing then? Or should I look for something smaller?
    Really struggling with the choice of motor..


    I think I understand. Any tips on the sort of inverter I need?
    I thought the inverter was converting mono-phase to 3 phase so I could run a 3 phase motor in a workshop with only mono-phase.
    Is there a different kind of inverter that goes from 3 phase to 1 phase?
    Thanks for the shaft, that’s clear 😉


    inverter : will save you energy and gives you speed control and a number of safety electric functions. however, without you still need to install a start & run capacitor (large) on this very motor.

    there is nothing you have to fix, ‘just’ get a drive shaft of 35mm diameter, with keyways and fitting couplings. 25ish mm driveshaft suggests a smaller type of motor too; even less likely to run well for this device.

    I know this can be overwhelming and as always I recommend to find a metal work shop near you – for them it’s a piece of cake to get you the right parts, also for a better price.


    the motor is alright but yet a little weak for thicker plastic.
    the hollow bore means the inner diameter of the reducer, should be at 35mm for this type. so yes, you still need a coupling for this.
    also, it´s good idea to operate this motor at 3phase, you still need and inverter to run it on mono phase.
    does this make sense ?


    Hi there,
    I’ve just received delivery of the shredder laserparts. Excited to get started with the build!
    I’m looking for motors at the moment and I found this one on ebay
    I’m not knowledgeable at all and I’m wondering what the “hollow bore” means.
    Will I be able to put the hex shaft straight into there? (Once turned to the correct dimension?) Or do I need to find another shaft and some sort of coupler?
    There is another motor with a 25mm hollow bore, is that preferable?
    Thanks for your help!


    JULI (Shenyang Juli Engineering Co., Ltd.) is a professional China Portal Reclaimers Manufacturers and Portal Reclaimers Suppliers. our factory is located in Shenyang, the center city of Chinese heavy industry and capital city of Liaoning Province. At present, JULI has 66 employees who are assigned in different departments. JULI has the independent import and export rights with the capability of designing low voltage motor and manufacturing of solid material handling system.

    Homepage: https://www.julimachine.com/

    Tel: 86-24-85718940

    E-mail: [email protected]

    Add: Economic Technological Development Zone, Shenyang City, Liaoning Province, China


    hi guys
    i am making the compression machine and i’d like to get it more automated
    i am looking into arduinos modules.
    so it would be :
    -1 arduino uno
    -1 max6675 module to get the temperature
    -1 dual bridge l298n to command 2 electric cylinders.
    -2 electric cylinders

    safety :
    -no cold start of motors before t° has reach 200°
    -upper limit switch when 2 moulds are touching each other
    -lower limit switch

    has it been ever tested  ? anyone in the team happy to help me with arduino programmig ?

    crea-cregy sas



    As i am new on this i would like to ask few questions:

    RPM of Shredder PRO around 20 RPM
    RPM of Extrusion PRO = 263 RPM

    I am planning to use 5HP Motor on both machines. That sound reasonable?
    Would be possible to use speed controller besides a gearbox?

    Just one last question, i found this motor single false:(photo)
    that would work on both project or better use 3 phase

    thanks for all answer and help


    I found those 2 motors 5hp (USD 150.00) to Shredder PRO  and 3hp (USD95.00)for Extrusion PRO.
    Do you guys think those are good motors for this projects?
    I would need a reduction gear ratio 25:1 for Shedder Pro
    and what would be good RPM to the Extrusion PRO?



    What works better or/and cheaper?

    I have a powerful motor 8,5kw all set and ready to shred but I still need to reduce rotation speed.

    Can anyone help me with that?
    Separate gear boxes cost a lot (better to buy them together with a motor)
    I lean more towards changing frequency but I need some drawings and general market knowledge.



    I would be skeptical. I think the hot glue gun works because the piston (glue rod) diameter is small and moderate force creates decent pressure. Also I think the hot glue material has lower viscosity when liquid than something like HDPE. There was a post about a handheld extruder that was motor driven.

    Using the oven heating makes it hard to know when all is melted and ready to inject. Also the fumes need to be considered.

    If you try this approach, post your results, it will be new data for the forum.

    I realize resources are different around the world but I was able to build a desktop injector for about $100 in parts ( https://davehakkens.nl/community/forums/topic/portable-desktop-injection-machine/  ). Depending on what you have available locally you may be able to reduce it further ($30?) to just the two controllers and heaters.

    Good luck


    Romero sorry it took so long.
    With cross section of 619.28 mm^2 of cut which is circle of blade there. as max cutting of material
    Using HDPE as material with 24MPA Ultimate Yeild Stress
    Force to cut required is 3,340.5 Pounds of Force
    thus torque with your blade radius length of around 1.1 you are left with 500 ft lbs of force. so in this case if you are 160 lbs you would need to put a handle on it that is 3 feet long. But the most important thing about this is this is per contact tooth to material. If you have 6 teeth engaging the material at once then that goes up by x amount of time per extra tooth engagement so if 6 teeth are engaging you have 3000 ft lbs required etc. from my studying of my own shredder cutting by hand just cant really be done unless you have massive amount of mechanical advantage. Pulley system. giant breaker bar (10 ft long). Or hydraulic or something.

    However, with these same calculations at about 30 rpm of the motor you need approximately .45 hp or 340Watts of engine power per tooth engagement. so if you had a 3 hp motor geared down to 30 rpm then you can have almost 7 teeth engaged at once no problem. Now will you mechanical components survive 3hp that is probably not going to happen.

    This calculation is again worst case scenario if you tried to cut a 1″ diameter piece of HDPE in your machine. So these calculations would be fore the worst possible scenario you machine will encounter.


    josette: the design does come into account. Once you find out what force it requires you need to design the shaft such that it does not fail in torsion. Generally in a shredder if not designed properly this is the first place it will fail if you have a motor strong enough.

    sail: this: Solve for Torque = (HP * 5252) / RPM = 10.5 Ft-lbs (pounds) is correct equation.


    Hey guys and girls!
    I am brand new in the community and i was thinking about to combine the shredder and extruder together with one motor so you need much less materials and have a 2 in 1 machine!!!!

    For explanation you connect the 2 machines on the same motor or wave!

    Does anybody of you tried out these method?

    Id like to say thank you for such a nice project! Its fantastic!!!!!
    I am traveling right now threw indonesia and see everyday tons of plastic lieing arround or burned on the street!!!! I think THESE project is a big step forward to become plastic precious!!!!


    Unfortunately, no.

    Based on the first reply I contacted the electrical engineer that had wired up my motor and he assured me that it was properly earthed.

    I then took another approach.  Where I shred is close to the earth grounding rod for our house, so I ran a cable directly from the earth rod to the machine and I still had a build-up of static.

    Topic: About the Motors.. in forum Questions?


    How can i use 380V  motors as 220V?


    What does the output speed affect on Extrusion Machine, How much should the output speed be for the average machine? I mean, Precious Plastic’s website says an output speed of 40-140. When it’s 40, what purpose can we use it for? When it’s 140, what purpose can we us it for? We talked with those who make the machine with output speed around 70-80, but if our supplier gives us an engine with 140 output speede what happens?


    Unfortunately no reactions to my post,
    which amazes me a little ’cause i think that almost everyone working with plastic will eventually have to make/get a shredder?

    For me making ‘an original with all the blades and motor’ was out-of-scope for now and the alternative seemed doable with the materials I already had, so i decided to give it a try.
    The result: https://www.youtube.com/watch?v=g0bfGw5liHY

    Feel free to leave comments here, or below the video!




    Well, actually, that’s a good question! I don’t really have a method of monitoring the motor power output. I can set the stepper driver amperage and the control software gives me information about set and actual speed, but I think for real measurements I would have to hook a torque meter on the motor shaft?

    The die swell seems to be quite essential. For now the nozzle diameter is 1.75 mm, but I was thinking about a nozzle size of 5-6 mm in order to get the carbon fibers nice and easily through the orifice.

    One thing, I have to figure out somehow is the e-steps/mm value, which is usually determined by the difference 100 mm filament extrusion and the actual measurement. But… I’m not extruding filament :/ any ideas?


    Looks like a great start. Do you have a way of monitoring how hard the motor is working?

    What nozzle size do you plan on using? I noticed that when I create a bead of hdpe with my injection machine, it tends to expand quite a bit.

    Actually, your back-up plan of bolting it to a CNC machine sounds like a great trial run for optimizing the print parameters.

    Good luck, great work


    Thank you for your feedback!

    Yes, indeed the use of HDPE/PP will be a challenge in every way, but as I mentioned, I’m going to mix long (6-25 mm), chopped, carbon fibers into the polymer in order to gain maximal strength and rigidity. I’ve been printing quite a lot with CF-enhanced filaments like CF-Nylon and CF-PET/G and you can achieve pretty amazing stuff with them, although the fibers in those filaments are quite short. Usually they have to go through a nozzle of 0.4/0.6mm.

    The nozzle size I’m aiming at with my pellet extruder would be 5-6mm. This enables me to use much longer fibers, maybe even a continuous fiber tow. The polymer acts as a binder material to keep the fibers together. For sure, this process won’t give you parts as strong and stiff as the cross laminated carbon fiber mats, but I’ve read some research that stated that the strength could be as high as 45% of a traditional carbon fiber part. The material testing of the printed CF-HDPE/PP will be also part of my thesis.

    For now, let’s say it is a hunch, that there could be something in this approach. In 5-6 months I can deliver facts.

    As for the size of the stepper motor and the reducer, I used the Dyze Design Pulsar extruder as benchmark. The stepper I’m using is Nema 23 with a 47:1 reducer. We’ll see, if that is going to generate enough torque. According to the torque curve, it should be able to output 40Nm at low speed. The screw profile is a standard 3-stage compression profile, channel depth starting at the 4 mm feed section and going up to 1.5 mm at the metering section. The L/D ratio is around 14:1.

    The mass of the extruder and its inertia will be an issue, but I regard it to be solvable by a stronger/stiffer frame. The BLDC I’m going to use have enough power and speed. I’m not sure though, if I manage to come up with an improved frame on schedule. My backup plan is to bolt the extruder to the gantry of our school’s CNC router.

    I’ll keep you updated 🙂


    Thank you for posting this. I had not seen the hangprinter materials. Sounds like you have and exciting project for your thesis.

    A few questions and comments:
    How did you size the stepper motor/gearbox for your extruder? What does the leadscrew profile look like?

    Doing a scooter frame design with HDPE or PP sounds challenging given the low structural properties. I wonder if you will end up with mostly solid cross sections.

    The hangprinter design appears to be sensitive to printhead inertia. Putting your extruded on the print head will increase both the mass and the moment of inertia. The printhead that @3dseed https://davehakkens.nl/community/forums/topic/3d-printer-for-pet-particles-no-filament-ever/ is using in his design appears to be a lot smaller. Perhaps for larger prints, develop a larger or flexible hopper that can feed a smaller printhead.

    Please post updates, this is an interesting approach.


    Hi there!

    I’ve been following Precious Plastic for about a year now and I have to say, it’s a wonderful project! One, I’d like to contribute to at some point. Currently, I’m in my last year of industrial design studies and I’ll start soon my Bachelors Thesis on designing a 3D-printable monocoque frame for an electric scooter.

    I’m planning to actually print & test the frame next spring/summer. As my primary tool I will use my Hangprinter, that I’ve been developing the past 1.5 years. The Hangprinter is a frameless printer-concept by Torbjorn Ludvigsen. The printer consists of a base unit with all the electronics and motion mechanics, and three anchor points on ground level for dyneema lines, which are used to position the print head. It is a quite unique concept, but foremost it is easily scalable to (theoretically) any size needed by only extending the lines.

    For more detailed information you can head over to http://www.hangprinter.org There is also plenty of information on the RepRap Forum

    My printer has currently a 2.5 m tall tetrahedron frame, a heated print surface and the e3d-online SuperVolcano filament extruder attached to it. I did this summer two big print projects on it. One was a giant high heel for a finnish shoe designer and for the other project we printed the shell parts of a prototype robot. What I learned, was that the current FDM-technology is far too slow for a printer this big and of course that in long term it is not viable to print anything else than waste plastic.

    This is also the reason, I’ve been interested in Precious Plastic. You guys have come up with nice machinery for shredding and extruding plastics. If you want to print with waste plastic, the first step is to shred it. My initial thought was to make my own filament, but after second thoughts I realized, that it is just a unnecessary step. So, I began to study commercial pellet extruders and their open source counterparts. Finally, I designed my own extruder and I’m now in short time getting it ready for testing.

    Tech specs are as followed:
    Weight: 4.5kg
    Length: 550mm
    Effective screw length: 225mm
    Heating: 3 x 180W /230V

    First, I’m going to test commercially available recycled HDPE and PP pellets in order to rule out issues caused by raw material impurities and quality, but eventually my plan is to test shredded flakes.

    I know that both HDPE and PP are going to be really tough to print due to their heavy warping properties. That is something, that can possibly be addressed only by a controlled heat chamber. But before that is going to be on my todo list, my idea is to mix chopped carbon fibers into the polymer. Fiber-enhanced polymers usually print nicely, since the warping is mostly eliminated. I’m hoping this will be the case also with HDPE and PP.

    The printer frame is going to need an update to be able to handle the stress caused by the pellet extruder. I already have a new set of BLDC-motors with rotary encoders, that will do the heavy lifting. Each of them is rated with 1.8kW and there will be 4 of them in total. Also new Dyneema line is on the way. A single line will be able to lift around 140kg. The whole system runs on a Duet 2 Wifi controller and ODrive BDLC-driverboards.

    So, what do think? Do you have any questions, feedback, etc.? Do you think this setup could be beneficial for Precious Plastic?


    In reply to: Shredder motor


    For the small amount that the Shredder can spread at one time. I feel that the motors are overrated. Liking the idea of the mobile unit, has anyone tried a 12vDC high torque, low-speed motor?  like these shorturl.at/fDUV4

    Much Cheaper and lighter 🙂

    I have been looking at the idea of making the Shredder with Plastic,


    In reply to: Hi from Saarland


    Thanks Patrick,

    That’s great news, and I’ll go that route as well and try to get a motor similar to yours. I love not needing to mess with a gear box in the beginning.

    Cheers and happy holidays!

Viewing 30 results - 1 through 30 (of 2,220 total)
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