in the section be the cutting force is constant. if ever, in the trait ab you have a trend of the cutting force that decreases linearly. in a, worth 5/4f. poi, passing from a to the knot b, the cutting force is reduced to -3/4f.
in the section from b ad e, the cutting force is constant and then it will be annulled in the knot e. I'll draw you a pattern in the evening.
