chicks

starter

06/04/2019 at 06:59

@xxxolivierxxx Thanks! I will double check the reducer but I think it should work, its definitely a beast of a machine. Its nearly as heavy as the motor. 😀

msnmck

starter

17/04/2019 at 09:06

This shredder design is based on the 2.0 version of the shredder, however, all the changes from 2.1/3.0 are fully compatible (new hopper and new sieve design)

This is my biggest fear right here.  I’m trying to send the 2.1 designs off to a shop to get the pieces made but the 2.0 design is the de facto so I would have no idea how to easily get these conversions to a shop.  Isn’t pretty much the only difference a few holes and one less weld spot?  Idk, I’m probably overthinking it.

xxxolivierxxx

hero

17/04/2019 at 09:17

@msnmck all these shredder versions are the same thing, the only difference is that the newest version has a square hopper instead of a piramidal one, and an easier to remove mesh filter. The base of the shredder box is the same in 2.0/2.1/3.0 so you can use these files without any fear

msnmck

starter

17/04/2019 at 09:52

That’s useful information. Thank you. I just remember the official assembly video saying something about less welding and mentioning the sieve.  I would kind of like the convenience involved with an easily removable sieve but eh 🤷‍♂️

msnmck

starter

30/04/2019 at 07:32

So I was actually reading through the thread just now and wanted to point something out

You can buy the sheets of steel in many places, but my favourite is Online metalsSome examples:
Mild: https://www.onlinemetals.com/merchant.cfm?pid=13973&step=4&id=944
Stainless: https://www.onlinemetals.com/merchant.cfm?pid=9806&step=4&id=793#

The “Stainless Steel” link leads to an aluminum extruded thingy.
Thanks for all of the info regardless.

xxxolivierxxx

hero

30/04/2019 at 07:40

@msnmsk seems like they changed the link or ran out of stock for that item. Here’s an alternative https://www.onlinemetals.com/en/search/results?q=stainless+steel+sheet+0.125%22%3Arelevance%3AMaterial%3AStainless%3AShape%3ASheet&checkbox=on#

msnmck

starter

30/04/2019 at 07:44

Wow, that’s a huge difference in price.
I have learned so many things I will never remember thanks to all of this community’s hard work. 😅

chicks

starter

24/05/2019 at 13:03

After many hours of machining/sanding/design tweaking (I learned a lot of things making this for class) I finally have my fully functional plastic grinder ready to go and help break down usable material for my thesis. Much thanks to this community I wouldn’t have been able to do it without your help. As a side note: yes that dress is made out of recycled upholstery fabric AND the grinder also shreds fugitive rubber from old molds like a dream (although its a bit fleshy when it comes out…).

chicks

starter

24/05/2019 at 13:05

One of the techs made me lock out the machine because people can’t seem to stop putting their fingers near the blades… … …

xxxolivierxxx

hero

24/05/2019 at 19:43

That’s awesome @chicks, congratulations. Do you have any videos of the shredder you can share?

By the way, did you build your shredder using the Imperial units files from this post, or the metric ones?

chicks

starter

24/05/2019 at 20:00

@xxxolivierxxx it was the imperial format. I was unable to open the original files for some reason but the imperial files worked well enough though I wish I’d been able to reference the originals. I do have video but I’m having a hard time uploading it places because it’s apparently too big. I’ll upload it when I get a chance to fix my file 😊

xxxolivierxxx

hero

24/05/2019 at 20:13

@chicks Awesome
I would suggest uploading it to youtube, and then just put the link here

snyder-devin

starter

16/06/2019 at 04:42

We are just starting our operation, and we purchased an assembled shredder head on ebay (the cost of laser cutting services here are very expensive). Our unit’s knives/spacers were made with 3/16″ and 1/4″ plate. we have noticed many of the thinner plastics we are working with don’t shear consistently, it seams like lots of plastics wrap around the knives and slide in between the fixed and moving knives.

I did the math on the spacing, sorry for you metric folks my brain works in imperial.

the original design has a 0.0393″-1mm gap between the knives
our American plate has a 0.0625″-1/16″ gap between the knives

Our unit has over 150% of the gap of the metric design do you think this is enough to cause the issues we have been seeing?
please note our head never came with the screen under the shredder and is putting out very course shredded plastic similar to a traditional ribbon paper shredder.

chicks

starter

16/06/2019 at 04:51

@snyder-devin
It was a bit of an issue but I ended up cutting a few extra pieces out of 11 gauge material and mostly moved them around till they fit right. A little annoying but I fully expect to see that kind of issue when converting any file 😊 so not a big deal. Converting anything into rhinocad that isn’t rhino is always a hassle but that’s what our machines run off of.

snyder-devin

starter

17/06/2019 at 00:06

I am not sure what you mean buy using 11 gauge sheets, this is a factor of 1/4″ plate is a bit bigger than 6mm and 3/16″ plate being a bit smaller than 5mm plate. Our shredder head is sturdy we can shake the knives side to side a tiny amount but that is the only slop in the system.

By the way we are using a 3/4hp 1140rpm with a 39-1 gearbox 29rpm output/1617inch pounds and a chain coupling which seems to work fine. We tried a half coupling with a spider like your unit, but it crushed the rubber spider in seconds. Found out it was only rated for 120 inch pounds.

jamesindia

starter

08/08/2019 at 09:08

Hi
I am planning one PP shredder that works after trial . can any one share a move if available ?

Thanks in advance
James

jamesindia

starter

08/08/2019 at 09:28

Hi
The above mail is confusing I suppose . I need a successful PP shredder model that works after trial , so that I can do it right at the first time . Any one may give a reply .

Thanks

xxxolivierxxx

hero

08/08/2019 at 09:30

@jamesindia there’s a big DOWNLOAD button right above the youtube video, at the beginning of this topic, that will allow you to download the shredder files in Imperial Units. If you want to use metric units, then download the original PP kit.

jamesindia

starter

08/08/2019 at 11:41

Dear Olivier,
Thanks for the information , It looks grate one . Is this a successful model after trial for PP   ?  what is the out put  size of expected from the shredder ?
Have a good day

eokeke82

starter

13/09/2019 at 03:41

It is extremely difficult for us to source for materials for machine production here in Ghana.Please we humbly wish to ask if anyone has information about where to source the materials for machine production. Getting to buy from outside the country is way to expensive for use to do as we are just a community based organisation working on promoting environmental sustainability through plastic waste recycling.We are also soliciting for anyone who has used or damaged machine which we can fix and use. Eve of it is outdated, we are greatly willing to [email protected] keep up the good works, as I have been following up on Dave for over 2 years now.

jeana

starter

20/11/2019 at 00:58

I’ve taken steps here in San Diego to get this process going – taking a class tomorrow to learn how to plasma cut the parts for the shredder… Many people have told me that laser cutting is better, but I do not at this moment have access to a laser cutter suitable for metal.  People have also informed me it might be wise to farm out the blades… but… well… I quite enjoy learning how to do new things.  Especially because it might inspire some ideas for other future projects.

Wish me luck!
And if there’s anyone in San Diego looking to help build a shredder from scratch, look up @preciousplasticsandiego on Instagram and shoot us a DM (not sure how messaging works on this website).

-Jeanna

jeana

starter

25/11/2019 at 03:25

I’m confused about a couple of things with the posts here… Someone posted that they sent the CAD files to be cut with the price points for each piece.

Knife 1 = is 3.89″ x 3.89″
Knife 2 = 2.76″ x 4.36″
Knife 3 = 2.89″ x 4.72″

This is confusing to me because the original blueprints say that Knifes 1, 2, and 3  are all 120mmx120mm, which implies they are square.

I figured when olivier did the original conversions, maybe he didn’t keep them square.  That’s fine.

The extra confusing part now is when I import the Knife 2 drawing, for example, for some reason the original size is 84.5″ x 104.431″… and when I keep the image proportional, then change the width to 2.76″, the automatic height becomes 3.397″.  I am wondering where conversion came from to A) no longer be a square, and to B) be so far off from the stated 4.36″?

Thank you in advance for any explanation on this.  I just learned how to cut metal and was going to start officially cutting the pieces, but then this really stumped me.

xxxolivierxxx

hero

25/11/2019 at 16:27

Hello @jeana
All size proportions for the shredder Knives were left untouched in the new Imperial design, the only thing I changed is the thickness of the files, but of course you cannot see that on a 2D file 🙂

Just Fyi, the Knives and spacers used here are not the original PP files, I’m using the files redesigned by @keesdeligt where the hex holes are “1 instead of 27mm. You can see his topic at http://onearmy.world/community/forums/topic/shredder-modifications/

jeana

starter

25/11/2019 at 17:12

Okay thank you. I’ve read all the info about the conversions and am very impressed and extremely grateful. The strange thing is Knives 1,2,3 are the only ones that don’t have the same dimensions as are listed in the blueprints, even in Dave’s files. The ones in Dave’s files are 84.5mm x 104.38 mm while
the blueprints say 120×120. Every other file except those three knives is spot on. I downloaded Dave’s files back in September so maybe he updated them before September but not the blueprints.

I’ll have to look into the shredder mods forum.

Just FYI, if you have access to CorelDRAW (you can get a free 15-day trial), they open the original files from Dave. And then you can tell it to convert to inches. No math, no fuss 🙂 Just save it as inches and send it to your cutting machine.

Thank you! I’m going to buy steel this week and get to cutting this weekend. Wish me
luck ❤️

xxxolivierxxx

hero

25/11/2019 at 17:20

@jeana Don’t trust in the blueprint measurements. I have found that they were probably created and never updated, while the CAD files received multiple updates over the time (For instance, the blueprints will tell that you need 15 knives but only 14 are used in the shredder).

About the Imperial conversion, its not as easy as just using a converter. Metric steel and Imperial steel are different. For instance, you can find 3mm metric steel, but you will never find a 3mm imperial equivalent, the closest is 1/8″ which is 3.175mm. That difference in thickness means that the shredder files (walls, screw holes) had to be resized, not just converted to imperial.

henrygi

starter

10/12/2019 at 23:25

i’m having the same problem as @nimrodmachine
the dimesions in the DFX files are all messed up

henrygi

starter

14/12/2019 at 23:35

i sent the DFX files to a machine shop. they said they were 10 feet long when they treated the measurements as inches, and when they treated the measurements as metric, they said that some of the parts had holes smaller than the width of a  human hair.

I opened the files in fusion 360 with the dimensions treated as inches, and they look fine.

what am I missing?