A professional who tends machines that separate sugar crystals, according to grain size. Respnsibilities include:

• Observes machine vibrating screens to ascertain that sugar is flowing.
• Cleans screens with brush and regulates vibrations of screens to maintain flow.
• Changes screens by disconnecting sleeves, removing wing nuts, and hoisting cover, using block and tackle.
• Takes sample of screened sugar for laboratory analysis.
• Tightens machine parts loosened by vibration, using handtools.