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Fastening of Load cell and Adapter Plates Screw joints that have not been properly tightened or have lost their pre-tightening force, cause sliding at the mating surfaces. Fastening of the load cell is especially critical. If a load cell is not properly secured, the zero point will be unstable. Sliding between other surfaces may cause the same symptoms.
Rolls and Bearings
An incorrectly designed bearing arrangement may give rise to high axial forces. The roll should be fixed at one end and free at the other. If both ends are fixed there will be a high axial (thrust) force due to expansion of the shaft with rising temperature. Even a correctly designed bearing arrangement may deteriorate with time; bearings become worn, and so on. This may give similar symptoms, such as slow zero point drift between cold and hot machine, or sudden jumps in the signal.
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