4.Adjusting Side tilt
After a good air pattern has been obtained, observe the depth of material across the discharge end of the deck.
The surface of the material should be smooth and uniform. The depth of the high side of the deck should be 1 to 3 times as deep as on the low side (closest to the operator). If the bed is too deep on the high side, increase the tilt. If the material is too thin on the high side then reduce the tilt. See figure 14c and 14d.
5. Adjustting speed
Vibration or speed serves two purposes in the correct operation of a Gravity Separator. First, the vibration serves to agitate the product bed so that it can be fluidzed more completely by the air flow. If speed is too slow, the product bed will not be properly fluidzed and no separation will result. If the speed is too fast, the product will be put into a turbulent flow condition. This result in too much agitation, and will tend to remix the product producing poor seperations.
Secondly, vibration is used as the separating factor foe converting the vertically stratified bed into a horizontally graded product. When operating within the range required for proper fluidization, increasing the speed moves product toward the high side of the deck and ddecreasing the speed moves the product toward the light side of the deck. See Figure 15A and 15B.