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Hello @juanbravo1992 !
I will try to answer your questions.
A motor with lower then 1.5-2kW seems to be to weak for shredding thicker plastic (thou this depend on your reducer).
You can use a motor with higher power then 2kW, but they usually cost more, and is most likly to be 3-phased. Most households do not have 3-phase current.
I believe that this was the best/most functional design to use. Others were tried, but this seemed to be the best. @davehakkens may know this?
If you shredd to fast the plastic can start to melt, and if you shredd slower then well, it goes slow…
I am aiming for something between 40-60 rpm for my shredder.
Hope this help you.
Try to get as close as you can, I got a barrel with 20mm ID and a 20mm drill, this is really tight, need to sand the barrel and/or the drill a little..
It is a good idea to have some thickness on the wall of the barrel, my barrel got 4mm walls.
The 34.9×1.2 pipe would be the best of those of your two options.
So, the questions should be, how much torque do you need?
I acctually got that question from the guys in R&D on Optinova when I asked for a motor…
Yeah, i got a used 2.2 kW motor and a 3 kW motor, got some reducers that hopefully can be fitted together with the motors. But for the shredder that I am building for Optinova I Think I will use a new motor with reducer 🙂
Also I tried to use as basic tools as I could, and noticed that you do not need so many tools. (this is for assemble the shredder)
Angle grinder, powerdrill, drill stand, vice, countersink (up to 20.5 mm or you can use a big drill), small files/rasps, rubber hammer, center punch, drills (10.5 mm & 9 mm), spanners (in my case 15 mm & 17 mm) threading tap (M5). And protective gear of course.
Alright, I have not had so much time working with the shredder, but yesterday I did some hours of work.
The guys at the workshop at my work did a great job with the axle/shaft. If you are going to have someone else make your axle/shaft for you, I recommend you also bring one of the bearings with you, so you get a perfect fit.
The assembly with almost without problems, only one of the countersunk holes in the sideplate for the bearing was not deep enough, also I needed to use some washers/spacers between the side plate and the bearings.
I am going to change some of the screws to shorter ones (not needed but it will look nicer).
The most particular thing is that our central dump is located in the crater of a volcano and every windy day we get a volcano that spits out plastic bags, literally.
I know its horrible, but I did laugh when I read it, now I got an image in my head of a volcano erupting plastic…
Nice, did that myself erlier 🙂
Remember to check that the blades fit to 🙂
Yes, a link to the forums… (like the links, “home” – “the plan” – “machines” – and so on…)
Did some more sanding and grinding, I did not need to do so much sanding on the parts, but I did need to use a small metal file (rasp) on the holes (first image).
Also did some preassembly to check that everything fits correctly. (second image)
Now I am waiting for the axle/shaft to get done.
Thank you @jegor-m for the advice to stack the blades to check the combined width, my axle/shaft will be 149 mm instead of 148 mm.
My wife caught me…. working!
My sanding machine broke down, so I acctually have to do some work :S
Trying to get the lasercut part sanded so I can get an exact measurement on the shredder axle/shaft.
Went and got some more materials to the shredder and extruder today 🙂
Stainless Steel would be hte best, but you can make it in carbon steel to..
Should not be a problem as long as your power supply can handle it..
Hey @iago !
It is a bearing (rolamento), this type of bearing got many names, Mounted bearing, Pillow Block bearing, Flange Bearing or a mixture of those name, technical name is “UCFL 204”.
Here is one from AliExpress with a good price; https://www.aliexpress.com/item/FL204-20mm-Bore-Self-aligning-Flange-Bearing-UC204/32795341714.html?spm=a2g0s.9042311.0.0.wH1S84
I think he is using the extruder and then some cutter machine?
Will try to guesting it!