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Nice, great idea!
I was thinking on this to, and the use of an old washing mashine. Like the one on the images, this type you can remove and use the motor, electronic and the drum.
Dave´s pipe is probably mild steel, the thermo-plastic extruder we use where I work use stainless I think. It should not be a problem using mild steel, thou there could be corrosion if left for a longer period.
The wall thickness one Dave´s pipe is 4mm, (OD 34 – ID 26 = 8 / 2 (two walls) = 4mm)
If you increase the size of the pipe, you should increase the wall thickness also, becose if you use a proper extrusion screw you will have higher pressure.
But with auger drill bits you should be good with 4mm wall thickness (biggest auger drill bit I have seen is only 34mm)
If you increase the RPM you run the risk of the plastic not heating up sufficiently, and increasing the temperature has the risk of burning the plastic.
You could also make an longer extruder then the plastic has more time to heat up, but then you have to find longer auger drill bit, or if you are skilled you could weld auger drill bits together, but that might be hard becose the screw needs to be straight.
Also the screws do get worn.
Hope this helps anything.
I guess you are talking about the shredder parts.
When I went to the cutter I used a memorystick(pendrive/flashdrive), and copied the entired 00_laser files folder.
If you downloaded the files kit, you will find the laser file folder.
precious-plastic-kit-master – precious-plastic-kit-master -& 3. Build – Shredder – Blueprints
Shredder blades look like blades/set from a paper/document-shredder?
Good work! Nice upgrade. And good idea with the gear system, I think I will use something like it for my machines, becose its hard to find a geared motor that gives 60-70 rpm cheap here.
On the blueprint and the Bill of Material it says that the tube is 34 x 26 (not 28).