The two considerations for setting conveyor belt height will depend primarily on the visual acuity required and downward force required. Generally, a degree of both will be required but the mechanics and posture related tradeoffs need to be considered. In a simpler example, if an object size is small there will be a need to raise the height closer to view, however, the tradeoff would be the weight of the upper body cannot use gravity so much to its advantage to apply pressure onto the object and allow the weight of the arms to relax the shoulder more.
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