DIY Tools and machinery

Hi guys,

I thought maybe we could compile a list of tools or machinery for scrapping that one can build on his own with limited tools as I always look at if I can build something before I buy it.

Starting off there is a shaker table that can be used to sort materials of different mass as for example copper from wire after shredding wires:




Then of course the heap of homemade wire strippers, this is my favourite as it takes five minutes to build:

I think the shaker table design is pretty cool. Now someone needs to come up with a way to pulverize insulated wire in a way that would separate the jacket from the copper. I know they do this sort of thing with Christmas tree lights.

I was think a paper shredder might work for thinner stuff, but I don't think it would separate the jacket very well.