wondering why stainless steel is used. Looking at making these in a developing country. Is there any reason any cold rolled steel could not be used? what about leaf springs. the have a high carbon contact and are hardened.
Great question, we are in Cameroon and do not have access to stainless. So it will have to be another type of steel. Hopefully, someone will have some experiences to share.
what if the blades whre made in plastic to?
This question has been ask a few times now, the use of stainless steel is optional. As mentioned in the download kit
Regarding plastic blades, I have see a video on YouTube of a mini shredder built with plastic blades actually I think the whole shredder was 3D printed, a bit of a gimmick, it worked, however very limited in what it could shred. Just not practical 🙂
I don’t think you would have very much luck 3D printing the parts for the shredder and trying to shred plastic bottles (PET).
However, something interesting for some people might be looking into “lost PLA casting” as mentioned here:
The idea being that you 3d print the parts out to make a mold, then mold them out of aluminum (steel casting is a bit more work, much higher temps)
Just a thought. However, you would likely still need to machine some of the cast surfaces to allow for good motion.
It would be a long process, but, then again, I love thinking in out of the box roundabout ways.
Hi, I’m doing a bit of research on this matter, I found these interesting links about materials for blades and hardening treatments:
At the end of the day I believe it’ll be down to your budget and what you have around. Sure the shreder will shred with just mild steel if you have a low budget, but if you can afford hardened steel it will have a longer life and require less maintenance. On that basis, you don’t have to use stainless steel but it’d be good if you can.
Hello guys the stainless steel is optional but someone mention that parts made out of regular steel (cold roll) will get rust with time depending how moisture is your place which will contaminate the plastic. just a thought
Mild steel would need to get zinc plated, and I believe that would still be cheaper than stainless, but probably not as durable.
I’d be surprised if you could 3D print plastic parts cheaper than having them cut from steel (unless you get free access to 3D printer and 3D print material).
I don’t think zinc (galvanized) steel would gain you much because the zinc wear and you’re left with mild steel. Also keep in mind galvanized steel generally has slightly different dimensions (since it’s mild steel + zinc plated).
Another option might be paint/coating (powdercoating/anodizing). Plastic isn’t terribly hard, so you could probably find some pretty good wear resistant paint that would last a reasonable length of time.
I found this website that provides a variety of instructional videos and, I found two pages that show simple and cost effective DIY plastic shredders. Maybe someone will find them useful.
hi guys! im from one of the provinces in the Philippines and dont have access to SS so what we used for our shredder was medium carbon steel which is cheap in our area.
and our machine worked fine.
Leaf Springs from Cars as shredder blades. Going back to an early idea of using leaf springs in third world contries It sounds like a good idea as per the steel type, as spring steel are generally 5100 series steel which should be excellent or that purpose. However when re-using springs, ie, flat leaf springs from cars, which are already hardened may cause some processing issues unless you have some blacksmithing equipment and a source of heat like a propane forge for example.
I would envision the leaf to be cut into pieces for the blades and opposing parts with a cut off wheel on a hand grinder, then these parts would need to be heated red hot and forged until reasonably flat and to the right thickness. Finally a hexagon tool would be required to make the inner hole if the current design is to be followed. Not impossible but very labour intensive, perhaps Ok when you don`t have any other options… You will need to be a pretty good craftsman to do that, then again a friend of mine routinely forges blades by hand often using old files or leaf springs from cars. Be safe if you intend to go this route!
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