The manufacturing process of the weighing scale

(1)（weighing scale)Select a disposable chopstick and polish it with a knife and sandpaper;

(2)(weighing scale)Cut the iron sheet into a circle to make a scale plate, bind it around the disc with string and lift it;

(3)(weighing scale) Drill a hole in one end of the polished scale and hang the disc;

(4)(weighing scale) Tie a rope with a 5g nut to make a weight;

(5) Hang the scale bar, disc and nut, find out the center of gravity of the whole system, drill a small hole in the center of gravity, and hang the rope as the lifting button;

(6) Do not put objects to balance the scale, find out the position of the zero scale line and make marks;

(7) Put on a 20g object and find out the position of the weight when the 20g object is balanced. Here is the position of the 20g object;

(8) Draw an average of 20 scales between the zero scale line and the position of 20g, and each scale is 1g