Job Description:

• 1) Operates pebble mill to grind emery, rouge, and other abrasives and separates them according to fineness by water suspension method: Examines abrasive under microscope to determine grinding time required, and grinds abrasive in pebble mill.

• 2) Turns valve to allow ground particles and water to flow into agitator tank.

• 3) Presses button to start agitator which stirs particles into suspension.

• 4) Stops machine and determines by microscopic examination when particles of particular grade have settled below tank outlet.

• 5) Opens stopcock to allow particles remaining above the outlet to descend into vat.

• 6) Repeats separation process for other grades, regrinding as required.