Coaxiality

In CNC machining, Coaxiality means: Deviation in concentricity between two axes. Good control here reduces both scrap and unnecessary overprocessing. Consistent handling of this concept is a strong predictor of first-pass success. Measurement capability and datum strategy must be validated together for this topic.

Process Impact

Do not tune this in isolation. Stable outcomes come from balancing machine behavior, fixturing response, and metrology feedback at the same time.

How to Apply It

• Control thermal and clamping influence during capability studies.
• Define acceptance examples for operator and inspector consistency.
• Align datum interpretation across programming, setup, and inspection.

Risk Focus

Surface issues are often system problems, not just feed or speed mistakes. Ignoring gauge variation can hide real process drift.

Inspection Priorities

• Retain known-good samples for calibration and training.
• Confirm datum reference frame before judging feature results.
• Run periodic gauge capability checks on critical characteristics.