Inside corners in this application create the motion shown below.
The inside corner logic uses two geometric variables to control the motions in the corner. The two variables are *r4x_corner_offset* and *r4x_corner_incr*. The illustration shows what these two variables control. The head moves perpendicular to the material until it is within *r4x_corner_offset* of the corner to be cut. At that point, the remaining segment to be interpolated is broken by *r4x_corner_incr* and the motions of the head are interpolated around while the angle of the head is changed as shown. When the tool reaches the actual corner, the tool direction will bisect the angle of the corner. Then, the process is reversed until the tool is again *r4x_corner_offset* from the corner and normal to the material.