Reliability of the five-axis cutter paths is critically important. With the addition of the two rotation motions in five-axis the chance for collisions greatly increases,

thus the collision checking and avoidance must be reliable, or else suffer damage to expensive equipment.

If one is not completely confident in their CAM system’s three-axis software, then they will not be confident in that company’s five-axis offerings. If a company is not willing to run their three-axis cutter paths unattended, they will not be able to trust their five-axis cutter paths.