Plastic Shredder

MachineInfoBox Plastic Shredder
Synonyms:	DE: Kunststoffschredder, Plastikschredder, Kunststoffschneidmühle, Plastikschneidmühle
Material:	plastics
Access Requirements:	Plastic Shredder Introduction
Manual:	preciousplastic.com (build instructions)
Tutors:	Lukas NitramLegov

This machine is still under construction, but over time the page should contain more and more information!

The shredder is the first machine we are building for the Precious Plastic project as all the other machines require small, somewhat uniform pieces of plastic as their raw material.

We should remember to take some photos with each step, so that we can put together a nice build log like this one in the end!

Materials

Armin got the laser cut parts and two flange bearings; they are in a box in the metal workshop.

Lukas contributed a piece of 27 mm (Schlüsselweite) hexagonal steel.

Components:

• 3 kW, approx. 1500 rpm Drehstrom-Asynchron-Motor
• gearbox: 20:1
• electronic components:
  • emergency stop: TBD (similar to the one at the CNC router)
  • 1xMotorschutzschalter 6,3-10A Gekauftes Modell:
  • 2xLeißtungsschutzschalter mit Hilfskontakten Gekauftes Modell: DIL EM 01 G mit 22 DIL E
  • 2xLeuchttaster für rechts- linkslauf
  • Stopp Taster
  • 3Phasen Hauptschalter

Missing:

• electronic components:
  • z.b.Gehäuse mit Hutschiene
  • z.b. Netzteil 230v zu 24V Output:>500mA
  • hopper cover safety switch (should stop motor when open)

We have a small selection of perforated metal plate (Lochblech) that could be adapted (cut and perhaps re-drilled) to be the "sieves" determining the particle size that comes out of the shredder.

Other materials include threaded rods and other metal parts that we should already have at the Space.

Tasks

The following tasks should be sufficient in order to assemble the shredder. If everybody is fine with github, we can also move this task list into a project on github. Please contact Martin if you want this to be done.

Number	Relevant Part	Task	Status	Responsible	possible tools
1	Shredder	Buy laser cut parts for the shredder itself	Done	Armin	-
2	Shredder	Buy the hexagonal Steel	Done	Lukas	-
3	Shredder	Adjust the hexagonal steel	Done	Johannes, Armin	Metal Lathe
4	Shredder	Assemble the Shredder	Done	Flor	-
4.1	Shredder	sharpen the blades	mostly(?) done	Flor, Armin	bench grinder
4.2	Shredder	harden the blades	not started	who else would like to help?	Luca's & Chris' furnace?!
5	Shredder	weld the assembled shredder parts together	Done	Luzian	Welding Transformer
6	Shredder	make a hand crank for first tests	Done		-
7	Motor	set up suitable motor - we have a motor (3 kW, 1500 rpm) and ordered a gear box (target speed approx. 70 rpm), they need to be mated	Done	Johannes, Lukas	hacksaw & clamps as makeshift gear puller
8	Motor	attach the gearbox to the shredder axis	Done	who else would like to help?	metal lathe
9	Motor	switches - select & install an emergency stop, direction selector and a Motorschutzschalter	Done	Johannes, who else would like to help?	-
10	Framework	design the framework	Done	Armin, who else would like to help?	-
11	Framework	buy the needed parts	Done	who else would like to help?	-
12	Framework	Assemble the framework	Done	who else would like to help?	Welding Transformer
13	Hopper	Decide on the Material	Done (all metal, window could be added later)	-	-
14	Hopper	Assemble the hopper	Done	Flor	Welding Transformer
15	Hopper	add a clear cover and a safety switch (endstop) that recognizes when the cover is open another option could be a "revolving door" one-way feed like at the end of Kunststoffschmiede's shredder bike video	Done	who else would like to help?	-
16	Overall	put it all together. Mount it to table and create particle size filter.	Done	who else would like to help?	-
17	Overall	security check, define the introduction	In progress	at least 1 manager, who else would like to help?	-

Vorläufiger Strohmlaufplan: