Final answer:
To compute angles of rotation and tilt for drilling and milling angular surfaces when no length dimensions are known, trigonometry and basic geometric principles are used.
Step-by-step explanation:
In order to compute angles of rotation and tilt for drilling and milling angular surfaces when no length dimensions are known, you would typically use trigonometry and basic geometric principles.
For drilling, the angle of rotation would be determined by the angle of the drill bit relative to the surface being drilled. The angle of tilt would be the angle at which the drill is inclined relative to the perpendicular.
For milling angular surfaces, the angles of rotation and tilt would depend on the specific milling operation and the desired outcome. The angles would be determined based on the geometry of the surfaces being milled and the orientation of the milling tool.