Fit

On the shop floor, Fit can be understood as: General term for hole-shaft fit relationships. Good control here reduces both scrap and unnecessary overprocessing. Treating it as controlled process data reduces shift-to-shift variation. Use first-article evidence and trend data to keep this item stable over time.

Setup Notes

• Select gauges and measurement strategy based on feature function.
• 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.

Early Indicators

• Roughness drift without obvious parameter change
• Different decisions between inspectors on same feature
• Capability loss after fixture or tool replacement

Failure Modes

Symbol misinterpretation can pass local checks but fail assembly-level requirements. Surface issues are often system problems, not just feed or speed mistakes.

Stabilization Strategy

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.