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In case extrusion screws run out of stock in the bazar or unavailable in your country, I found a supplier who provides extrusion screws, barrels and other accessories.
They both have 588mm and 790mm sizes.
Here the links :
588mm set (screw+barrel+nozzle or just separately)
790mm set (screw+barrel+nozzle or just separately)
Also a nice post to make your own filament maker :
TO precious plastic team : You can delete my message if you think it is not appropriated to send it here. I don’t advertise anything, I just want to help people to find this famous screw so difficult to obtain.
@thegreenengineers, thank you for your interest, hope to see some explanations about my questions A,B,C.
@s2019, thank you for your answer, if I understand well, you mean it is better to keep the bicycle rim empty inside and just put the weight around. Is that right?
If yes, for sure I can keep the original rim. Easier.
Then how should I put the weights ?
Distributed in a balanced or unbalanced manner?
If unbalanced i will not put the weights all around.
Continuously or discontinuously?
If continuously, I can fill the inner tube of the tire with concrete.
If discontinuously, I can fix some weights 1kg around following your way.
A quick sketch could be very useful for me.
Below a link to the new inertia flywheel using concrete (which is very good in compression and not good in traction) enclosed in a shell.
And a link to an interesting machine : the pedal powered mill
I would like to continue the idea Katharina started.
Hope you can see my message.
A- So you confirm that a flywheel with a gym 20kg cast iron lifting plate would be enough?
B- I also want to have the shredder in front of me so I can put some plastics during I do exercises. And also higher, so I will need to have a second set of sprocket and chain. Could you tell me which diameters should I use for the wheel sprockets 1,2,3? I know that there is some rule about small then big to get better torque. But with 3 sprockets I don’t know.
C- I will cut the rear frame and keep the whole shift mechanism to mount it to the front, so I could increase the speed progressively. Do you think it is necessary to keep the shift mechanism with all different diameters of sprockets?
It’s seems to be extrusion, but steps behind i am not sure.
Anyone have an idea about how they keep a similar grey color each time?
Seps before extrusion?
Conceptos plasticos already do this :
I am searching about the process
To not waste time at keeping shavings, I saw my friend use a vaccum plugged on the cnc milling machine when is running 😉
A clean bag is better before start with a different material in order to separate materials.
Looking forward to hear news
Just before compression, you could try to add carbon or glass fiber stringers (in the same time as the bolt insert (depend of you mold))
I think it’s a nice idea, and it needed to be tried to be sure it doesn’t work.
One hard part is the mold, i would be interrested to help you as i work already with molds for others products and i like your concept.