Five-axis machines are roughly 3× the capital cost of a 3-axis VMC. Programming time is also higher. So when does the math actually favor five-axis?
The decision factor: setups
Forget cycle time. The dominant cost on small-batch work is setup time. A part that needs five orientations on a 3-axis machine takes five setups, each with its own fixture, indicator pass, and tool offset check.
- 1–2 setups: 3-axis wins on cost every time
- 3 setups: roughly break-even, depends on part complexity
- 4+ setups: five-axis wins, often by 40%+
The hidden multiplier
Each setup also stacks tolerance error. A part with five 3-axis setups can accumulate 0.005″ of stack-up between features. On five-axis, that error stays inside the machine’s repeatability — usually under 0.0005″.
Count setups, not features. That’s the number that decides the machine.