Five-axis machine limitations can affect how one chooses to perform five-axis machining on a mold. CAM software must be able to simulate the particular five-axis machine and adjust the cutter paths to avoid running into a rotational limit. If a particular five-axis machine has a limit on the c-axis,

the CAM software must be able to place the necessary unwind movements into the cutter path, all the while maintaining a collision-free cutter path.

Additionally, many five-axis mill configurations have varying limits on their a/b axis. Many trunnion style machines can rotate in the a axis negative 90 degrees, but allow only 15 degrees positive rotation. For this reason, it makes sense that the CAM software automatically takes this limit into consideration to avoid running into limits in the positive direction.