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Viewing 30 results - 1 through 30 (of 2,228 total)
  • Participant

    Yet another modification to the extrusion machine.

     

    v3 upgrade screw.

    Using 2hp copper wound motor with belt and pulley/sprocket and chain speed reduction.

    2 heat zones

    Upgraded the heaters to 2.25kw and the barrel is 1.75 inch bar stock, turned down to 40mm OD and the inside is a much tighter tolerance than the sloppy plumbing pipe.

     

    We are about a maximum of 6.4kg per hour extrusion with this screw.  Next unit will use the Robot Digg 30mm OD screw.

     

     

    Participant
    0

    Hi @klasu,
    thanks for your pm
    I have solved my problem with the coupling and this is what I used:
    HRC couplings (this explains a bit what they are)
    https://simplybearings.co.uk/shop/Engineering-Parts-Couplings-HRC-Couplings-HRC-Coupling-Flanges/c4713_7586_7587_7589/index.html?page=1
    I had a 35mm shaft from the motor and 20 for the shredder
    I used a HRC 110 H coupling : Here
    and two metric 1610 taper bushes, one 35mm and one 20mm : here

    the 1610 taper bushes are the correct number for the 110 couplings. If you chose a different size coupling, you’ll need a different number taper bush.
    Here is a good table showing you the different specs for HRC couplings.

    Good luck!
    Let me know how you get on

    Participant

    Hi out there,

    my shredder is almost ready. But one crucial detail is unsolved:
    how to connect the motor (28mm shaft) to the hex bar (20mm) of the shredder.
    For industrial purposes are a ton of expensive couplings available, with a fixed size.
    Do you know any low-tech-methods of connecting them together without the use of a lathe?

    Thanks

    In reply to: Managing static

    Participant
    0

    We had the exact same problem. We are using couplings to connect the axles from the gearbox to the shredder box, so I don’t think the shredder box was actually grounded. We solved it by running a wire from a bolt on the shredder box directly to the motor’s ground (grounding the shredder box).

    Not only did it kill the static charge, but it also sped up the shredding process by removing the buildup on top of the blades and gave us larger sized mulch instead of a fine “snow”.

    I hope this helps!

    Participant
    0

    We had the exact same problem. We are using couplings to connect the axles from the gearbox to the shredder box, so I don’t think the shredder box was actually grounded. We solved it by running a wire from a bolt on the shredder box directly to the motor’s ground (grounding the shredder box).

    Not only did it kill the static charge, but it also sped up the shredding process by removing the buildup on top of the blades and gave us larger sized mulch instead of a fine “snow”.

    I hope this helps!

    Participant

    Hello Everyone in the PP team
    So we have been following for years the development and the community and after some time we finally built our machines here in Cairo, Egypt
    We are facing some minor problems so first we are seeking the community support for that:
    1- The extrsuion machine output seems to be bubbling out of the nozzle even when using the smaller 3 mm nozzle,if not pulled it keeps expanding into a bubble and makes it hard to have a uniform output

    2-The bearing support got bent towards the motor, the same problem was reported on the forum before but not much replies. Our extruder is the old design and I know the screw can create forces for the horizontal motor and coupling, but any thoughts?

    3- The texture of the output seems rough and uneven, is this more related to speed or heat, too much heat or too low. I think cooling is a factor as well. I know I am asking a lot but we had a late start 🙂

    For any people here in Egypt feel free to reach out to grow the community and have impact collaborations

    Stay safe everyone

    Attachments:

    In reply to: Shredder efficiency

    Participant
    3

    @peterlimburg
    @xxxolivierxxx
    @mohammede335

    Hello dears,
    first of all i want to thank you all for your useful replies.
    i was not actif during last months because of the covid-19 pandemic and our country’s curfew.
    the comment in the table is very correct, this is really what i am facing, once i make some money i will switch to 3 kw motor.
    for the threaded rod bending please check the picture attached to this post.
    Best regards.

    Attachments:

    In reply to: mold active cooling

    Participant
    0

    Those look really great. I really like your “engineered with what’s cost effective locally” approach to building your machines.
    Would a motor (drill?) driven scissor jack work as a replacement for the log splitter?

    Thanks for the update.

    Participant

    As the title suggests, I need a motor for my shredder but can’t find one with an rpm lower than 2000. So anybody got one for sale or any tips?

    Kind regards,

    Pele

    In reply to: Shredder efficiency

    Participant
    1

    @khebizi
    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

    Attachments:
    Participant

    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
    Jean

    In reply to: Shredder efficiency

    Participant
    1

    @peterlimburg
    @xxxolivierxxx
    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

    Participant
    0

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

    Participant
    0

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

    Participant
    0

    Thanks,
    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 😉

    Participant
    0

    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.

    Participant
    1

    hi,
    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 ?
    g

    Participant

    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
    https://www.ebay.co.uk/itm/Single-Phase-2-2kw-Motor-and-Worm-Gearbox-70-rpm-output-35mm-Hollow-Bore-182Nm/221311814628?hash=item3387364be4:g:QLUAAOSw6VRbKQIp
    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!
    Jean

    Participant

    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

    Participant

    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 ?
    thanks

    Arnaud
    crea-cregy sas

    thanks

    Attachments:
    Participant
    1

    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

    Attachments:
    Participant
    1

    Hi.
    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?

    Regards
    Elton

    Attachments:
    Participant

    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.

    Thanks!

    Participant
    0

    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

    Participant
    0

    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.

    Participant
    0

    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.

    Participant

    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!!!!

    Participant
    0

    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?

    Participant

    How can i use 380V  motors as 220V?

    Participant

    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?

Viewing 30 results - 1 through 30 (of 2,228 total)
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