Rz

In CNC machining, Rz means: Maximum roughness height parameter. Good control here reduces both scrap and unnecessary overprocessing. Its value grows when teams review it as part of the full machining system. Measurement capability and datum strategy must be validated together for this topic.

Execution Guidelines

• Separate geometric error from surface-generation error in analysis.
• Use staged control plans from roughing through final verification.
• Control thermal and clamping influence during capability studies.
• Define acceptance examples for operator and inspector consistency.

Early Indicators

• Capability loss after fixture or tool replacement
• Burr growth near tolerance-critical edges
• Dimension pass with poor assembly behavior

Stability Risks

Ignoring gauge variation can hide real process drift. Symbol misinterpretation can pass local checks but fail assembly-level requirements.

Scaling to Batch Production

Teams usually stabilize this area by linking inspection plans to feature function and datum strategy.

• Keep setup records and inspection evidence linked to each process revision.
• Re-validate after tooling, fixture, or control-logic changes.
• Use first-article and restart checks as mandatory release gates.