Steel rollers are required for calibrating whenever the workpiece has portions of soft and hard wood. For example:
When calibrating with rubber rollers, the soft parts would be ground out more, giving the illusion of antique wood.
Through calibrating some tenth of a milimetre up to max. 1 mm material can be abrased according to unit and abrasive grain. If a stronger material erosion is necessary, the use of a slicing unit is recommended or the calibration of the panel on one calibrating milling machine, e.g. LEDINEK ROTOLES.