TECHNICAL NOTES 8 GRINDING R. P. King
The particle will remain against the wall if these two forces are in balance ie. Fc Fgcos (8.3) where is shown in Figure 8.2 Thus a particle will separate from the wall at the point where cos Fc Fg (8.4) The critical speed of the mill, & c, is defined as the speed at which a single ball will just remain against the wall for a full cycle.
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