Tolerance

In production use, Tolerance is commonly defined as: Permissible range of dimensional deviation. This concept links drawing intent to measurable manufacturing capability. Treating it as controlled process data reduces shift-to-shift variation. Feature function should guide acceptance decisions, not measurement convenience.

Execution Guidelines

• Define acceptance examples for operator and inspector consistency.
• Align datum interpretation across programming, setup, and inspection.
• Select gauges and measurement strategy based on feature function.
• Separate geometric error from surface-generation error in analysis.

On-Machine Signals

• Burr growth near tolerance-critical edges
• Dimension pass with poor assembly behavior
• Roughness drift without obvious parameter change

Typical Pitfalls

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

How Teams Standardize It

Teams usually stabilize this area by treating gauge repeatability as part of process capability.

• 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.