What the machine knows: (1) Where the head is. (2) If you program it right, where the end of the tool is. (3) If you program it right, what the width of the cu

What the machine knows: (1) Where the head is. (2) If you program it right, where the end of the tool is. (3) If you program it right, what the width of the cutting edge of the tool is. That's it. You could maybe prevent it from diving the tool into the table. But you won't prevent it from trying to take a 2" cut into D2 steel. Or going down into a pocket and crashing the tool holder into a section of the workpiece. Or going down into a pocket and rapid moving left, slamming the tool into the workpiece (which if you're lucky will just break the tool).