Open Source Ecology Development Team, 31 May 2020

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From YouTube: Precious Plastic Pro Shredder Coversion to 3D Printed Parts

Description

Take a look at the design of the pro shredder from Precious Plastic. Download the STEP and use FreeCAD STEP import - https://wiki.opensourceecology.org/wiki/Precious_Plastic_Shredder#Github_Download

About 6" separation between rotors, shafts are 1.7". A gear transfers the motion from one shaft to another.

What can be replaced with 3D prints? We're determining if 3D printed bearings and geardowns could do this. While we know that a 1kW+ motor is required, we are doing both the kW-scale motor and a small motor like in a cordless drill, 100W, with 1000x geardown to achieve about 30 kg-M torque. Study the torque requirements at https://wiki.opensourceecology.org/wiki/Shredder_Drive

You can follow progress at https://wiki.opensourceecology.org/wiki/Open_Source_Shredder.

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A

Let's take a look at a precious plastic shredder here, so this is the dual shaft one. These chefs here are 45 millimeters. So it's about one and three-quarter inch about distance between the two shafts is about 140 or close 140 millimeters are close to 6 inch. So let's keep stripping this down. Click on the inside.

A

So the gears gonna take a look at how long this gear is these metal gears. So, let's see if we can 3d print them by beefing them up a bit, making them larger. So these are right now.

A

58 millimeters about sixty over two inches long. This is a pretty big thing, yeah over two inches, so quite chunky.

A

We can probably do that in plastic if we make these- maybe double herringbone, so there's more contact area and make them larger so talking about instead of two inches more like four inches and possibly on each side. So what I might do? Because the challenge here is okay, can we do this using lower cost methods? 3D printing is 5,000 psi for the structural strength of plastic and I.

A

Think if we quadruple this and do double herringbone, which is easy to 3d print, we might be able to do this.

A

And put on the other side put another set of gears like that. If these are not gonna hold cuz here, we're talking about pretty pretty good forces, two four, six, eight ten twelve about 24 blades on each side. So that's that's! Quite a bit there and.

A

Yeah, it's still the same construction here with these plates. A lot of these plates now we're looking at doing half inch blades so do about half the blades compared to here, but these blades are have more teeth. They've got.

A

C, let's expose this, take a look at one I mean these shafts are significant just to measure that again look at it.

A

Forty four millimeter.

A

Under two inches, but about 100 quarter inch yeah, that's about what we need. If you look at the individual blades.

A

They've got quite a bit of teeth, one two, three, four: five, six, seven, eight, nine ten, eleven, twelve thirteen or so, and then what about the opposing teeth? Are they the same?

A

The opposing teeth are actually different, so there's a bunch of on one side, it's more more teeth. On the other side, it's less teeth here, two four six. So let's count that again.

A

The starting of this one, one, two three can't see: okay, one two: three, four: five: six: seven, eight, nine, ten, thirteen. Thirteen to sixteen visit the race show you can take a look at this file. You can open it up in a freak, add import it as a step file, but yeah. This is pretty good. This is quite solid and for us we're gonna do since we want to ship up larger things like say, PVC, pipe sections and that could be like six inches.

A

Think we're going to benefit from the larger half inch, half inch blades just to be more scalable. At this point. Okay,.