mate i saw that a few weeks ago .
Its correct name is " gold shaker table "
It doesnt have an offset cam drive to shake the table , it has a flywheel with offset counterweights to shake it so you may be able to drop to single phase if you can gain some efficiency in the drive.
If it was mine , i would go to a reduction gearbox so you get around 3 - 4 cycles per second and you only need a stroke of around 5 - 12 mm , that thing would have shaken like a Hula dancer so you should need way less horsepower than it originally used , 4 cycles per second needs 240 RPM at the output shaft (equals a 6:1 reduction on a 1475 RPM motor).
, however the riffles on that table are too high in my opinion , they would be around 12 mm height so although you should give it a test run first before modifying them , i think you will end up shaving them down to 4 - 5 mm height to suit fine gold.
The easiest and most accurate way to do that is to get a bit of 20 x 5 steel flat bar 4 - 8 inches long , sit it next to the plastic riffle and run an angle grinder over the riffles with a 60 - 80 grit flapper disc , using the flat bar for a height gauge.
The catch tanks have rust in them , unless you have a mate with a sheetmetal folder then youre only option is to put a layer of fiberglass inside the tanks.
Youre in for alot of work but it beats paying $ 25 grand for a new one.
the other important detail is setting the thing up , the slope on the table top is critical , so too is the amount of water flowing across it , the water flow is the last thing you fiddle with and will change for every different type of material you put across the table.
They are usually set up with a level on the frame , get the frame exactly level and the table should have the right slope , i think from memory they use 4 degrees for a starting point.
ps , i have a few motors in my factory with offset cams , i will take a look tomorrow and see whats there.
