Haas Alarm: 401 (M) INVALID TANGENT IN GROUP 1 CORNER ROUNDING OR CHAMFERING – The point or angle calculated has yielded invalid results in automatic chamfering or corner rounding. This can be for one of the following: 1.) Tangent of angle was too close to zero. 2.) Cosine of angle was invalid. 3.) Hypotenuse of calculated right triangle was shorter than side. 4.) Calculated point did not line on arc or line. Check your program for geometry error and recalculate your coordinates.