Dimensional Tolerance

During CNC planning and execution, Dimensional Tolerance denotes: Permissible deviation for a nominal dimension. Good control here reduces both scrap and unnecessary overprocessing. Managed well, it improves process repeatability and lowers correction workload. Measurement capability and datum strategy must be validated together for this topic.

Why It Matters

Evaluate this topic with machine condition, setup method, and inspection evidence in one loop. That systems view prevents local fixes from creating new instability elsewhere.

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.

Frequent Issues

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

Inspection Priorities

• Trend capability metrics together with roughness outcomes.
• Inspect edge condition and burr state on tight features.
• Retain known-good samples for calibration and training.