Transition Fit

For CNC teams, Transition Fit points to this concept: Fit condition between clearance and interference. 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.

Where It Shows Up

This item performs best when programming, setup, and quality teams review it together. Cross-functional control is what keeps results repeatable after handoffs.

Best-Practice Steps

• 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.

Practical Warning Signs

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

Typical Pitfalls

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

Daily Control Items

• Inspect edge condition and burr state on tight features.
• Retain known-good samples for calibration and training.
• Confirm datum reference frame before judging feature results.