Straightness

In production use, Straightness is commonly defined as: Straight-line deviation of a linear feature. Good control here reduces both scrap and unnecessary overprocessing. A clear standard around this topic usually shortens prove-out time. Use first-article evidence and trend data to keep this item stable over time.

Operational Value

Treat this as part of an integrated process chain rather than a standalone parameter. That approach reduces trial-and-error and speeds up reliable release.

Control Actions

• 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.

On-Machine Signals

• Different decisions between inspectors on same feature
• Capability loss after fixture or tool replacement
• Burr growth near tolerance-critical edges

Troubleshooting Signals

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.