This document investigates the influence of flank wear land inclination on orthogonal machining using a slip line field model. It summarizes previous research that has considered both zero and non-zero inclination of the flank wear land with respect to the cutting direction. An experimental study is cited that provides evidence of a non-zero flank wear land inclination. A slip line field model is developed that takes flank wear land inclination as an input. Solutions are obtained for variables that characterize the slip line field using an algorithm. Results show that flank wear land inclination decreases with increasing rake angle and increases cutting and thrust forces and subsurface plastic deformation. Uncut chip thickness also decreases with higher flank wear land inclination. The study verifies that flank wear land inclination influences attributes