English to Spanish Tech/Engineering Mechanics / Mech Engineering

Hola a todos, estoy con una duda sobre "drafted" yo lo entendía como tracción pero en estos casos no veo que aplique.

FIG. X is a perspective view of a wide grader tool bit that is drafted to reduce drag as the tool bit passes through the ground or other work surface.

FIG. X is a perspective view of a penetration grader tool bit that is more heavily drafted than the tool bit of FIG. 23, helping to penetrate the ground or other work surface, and also lacking arcuate surfaces.

Various surfaces of the working portion of the tool bit may be drafted relative to the longitudinal axis L of the shank portion, allowing the tool bit to enter and exit the ground or other work surface more easily.

Muchas gracias por cualquier ayuda!