2-5 mm, this is simple and each vibratory separator will be able to handle this with a screen with a mesh aperture of 1 mm. If the difference between the product and the foreign objects is large enough, we call it coarse sieving. However, control sieving is also possible in cases where the difference between the product and the foreign objects is small, or in cases where both are very fine. This second case is called fine sieving.

The classic AMKCO vibrating vibratory separator has a spherical bottom, which guides the product towards a tangentially located outlet. This type of frame has capacity limitations. The product moves in a spiral movement on the way to the outlet of the vibratory separator and a large amount of the product will fill the machine. In most cases, the limiting factor will be the capacity of the screen mesh (the surface area of the screen that is available), but for those applications where this is not the case, a "Scalper frame" is available. A diagonally placed, flat bottom removes the product quickly towards the outlet. This scalper frame can be placed in any AMKCO vibratory separator and prevents the bottom of the vibratory separator becoming clogged with the product.