If your in farming country check around some of the hog farms, most had their own hammer mills.
I have two a light duty 5 hp and very heavy duty 7.5 hp, both mills came with a good assortment of screens.
The smaller mill is used to shred electric thermostats from electric ranges, hot water tanks, timers from washing machines and dryers to recover the silver contacts.
My larger mill will shred **** near shred anything you feed it, I mainly use the large mill to shred the plugs from computer cables to recover the gold plated pins.
I have feed the large mill satellite LNA's and B's then used a magnet to pick out the iron, which would have been the screws and some other trash. After it goes through the mill they so not look like screws anymore just balled up nodes.
The aluminum fractures almost like broken glass.
The output size of your shred will vary depending on the hole size of the screen installed, for instance a 1/8" hole size will make fine shred while 3/8" will be larger and 1/2" screen even larger.
Another thing I use the large mill for is cleaning heavy copper wire, the cooper and insulation are both liberated rather quickly. it's an easy task to separate the plastic from the shredded copper.
Just put the shredded material into a plastic pail then give it a couple of shakes, the heavy copper falls to the bottom while the plastic rises to the top where you can skim it off.
I try to keep things like stainless steel and iron out of my feedstock, it raises cane with the screens, but non ferrous metals and plastics are fair game.
Paid $200.00 each for these mills with screens. The large hammer mill is worth over 7 grand, it's lined with heavy amour plate.
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