The leveling operation itself


Leveling is performed exclusively by adjustment of the draft. Theoretically, there are two possibilities for such adjustment, namely via the break draft and the main draft, respectively. However, the main draft is always used because it is larger, and therefore finer adjustments are possible. Furthermore, use of the break draft would run the risk of entering the stick/slip zone.
Draft variation can also be carried out by adjusting either the infeed or the delivery speed. Adjustment of the infeed speed is generally used, since lower masses then have to be accelerated and decelerated at lower speeds. Furthermore, the delivery speed, and hence the production rate, remains constant.