alloy2 
Since we're interested in things seperating copper from insulation I'll go into some detail as to how the table works. There is two versions to chose from bumping or oscilating, they both peform well.
The bumping table gives a quick forward motion then on the return hits a solid bumper that gives the table a shock which tends to move the heavier stuff forward the water also helps move stuff forawrd as well wash the junk over the side for discard. This type of table has to be secured otherwise it dances around and they're very noisey.
An oscilating table runs much quiter with the advantage the table frame etc does not have to be bolted to a concrete floor to keep it from dancing around, this table probably needs a heavier film of water, The offset on the cranksaft that produces the ocsilaltion is 3/4".
As the table top become covered with heavies and lighter material water washes the lighter stuff over the side for discard same as the bumping table, here's the game changer the water a fluid moving forward then as the table quickly chages direction with the sudden change of direction the water rushes forward carring the heavier material along.
Water in itself is CDN gallon 9.9 lbs.
Tables are fairly simple, been around since the late 1880's, I'm going with the oscilating version also longer table work much better than a short one, some manufactues double deck them with the top table feeding onto a lower table to maximize performance.
The table used for the motherboards appears to use a solid rubber mat with the grooves having been cut into the mat, not sure if a dado blade could be fitted into skill saw to make these slots. For those of you that do not have welding skills a wood frame would work.
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