Take two shoelaces, hook each other in the middle part so that the two ends of each shoelace are located in the left and right directions, respectively.
Use the right clamp (moving clamp) of the machine to fix the two ends of the right shoelace, ensure that the two ends of the shoelace are 25mm apart, and then make the right shoelace hook the left shoelace at an angle of 52.2° with the help of a spacer, ensure that the hook point and the clamping point is 120mm apart.
Use the left clamp (fixed clamp) to clamp one end of the left shoelace and place the other end in the pulley groove. Attach a specified weight to this free end, and guarantee that the clamping point is 35 ± 5 mm away from the wheel groove.
During the test, the movable clamp reciprocates along the left and right straight lines at a constant speed to make the middle sections of the two shoelaces rub against each other. The abrasion resistance of the shoelace is determined according to whether the sample can survive the preset number of frictions or record the number of rubbing when the shoelace breaks.