If the integrated screening device is not sufficient (i.e. if chips and components have almost the same size, or if no mixture of parts is allowed), external screening systems are used.
If ferrous work pieces and grinding or polishing media have a similar size, they can be separated magnetically. Magnetic separators are also used to transport the work pieces from the finishing machine to the drier.
For trouble-free screening of chips and work pieces outside a circular vibrator, i.e. the Trowal double batch system.

