5. DESIGN OF BELT CONVEYOR The design of the belt conveyor must begin with an evaluation of the characteristics of the conveyed material and in particular the angle of repose and the angle of surcharge. The angle of repose of a material, also known as the angle of natural friction is the angle at which the material, when heaped freely onto Length related mass of the rotating parts of the idlers in a conveyor section Length related mass of conveyor belt 3.6 v Q l c zkd kg/m l m l m kd kg zkg k m kg/m 1000 B m t tj. v Q m j St l c 3 6 U M www.kmg.agh.edu.pl