Method of milling an interior region

A non-transitory computer readable storage medium having an executable program stored thereon, wherein the program instructs a computer to generate a tool path for milling a region of a workpiece with a milling cutter, the region comprising a first side, a second side and a third side, the method comprising the steps of:

• generating with a processor a first arc having a corresponding in-process material boundary which intersects the first side and which is tangent to the second side and to the third side;
• generating with the processor a succession of one or more second arcs, each one of which being characterized by:
• (1) having a corresponding in-process material boundary which intersects the first side, (2) being parallel to the first arc, and (3) progressing by a corresponding first predetermined value from the first arc toward the first side until the in-process material boundary corresponding to one of the second arcs has a maximum distance from the first side that is less than the first predetermined value;
• and thereafter
• generating with the processor a succession of transition passes connecting each one of the second arcs, end to end, with the first arc to form the tool path.

A machine for generating a tool path for milling a region of a workpiece with a milling cutter, the region comprising a first side, a second side and a third side, comprising:

• a processor coupled to a memory, wherein the processor is programmed to generate the tool path by the steps of:
• generating a first arc having a corresponding in-process material boundary which intersects the first side and which is tangent to the second side and to the third side;
• generating a succession of one or more second arcs, each one of which being characterized by:
• (1) having a corresponding in-process material boundary which intersects the first side, (2) being parallel to the first arc, and (3) progressing by a corresponding first predetermined value from the first arc toward the first side until the in-process material boundary corresponding to one of the second arcs has a maximum distance from the first side that is less than the first predetermined value;
• and thereafter
• generating a succession of transition passes connecting each one of the second arcs, end to end, with the first arc to form the tool path.