Geometric Tolerance

During CNC planning and execution, Geometric Tolerance denotes: Control of allowable shape and position deviations. It determines functional acceptance, assembly fit, and long-term product reliability. Managed well, it improves process repeatability and lowers correction workload. Interpretation should stay aligned between process engineering and inspection teams.

Engineering Significance

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.

Programming and Setup Tips

• Control thermal and clamping influence during capability studies.
• Define acceptance examples for operator and inspector consistency.
• Align datum interpretation across programming, setup, and inspection.

What Usually Goes Wrong

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

Monitoring Checklist

• Retain known-good samples for calibration and training.
• Confirm datum reference frame before judging feature results.
• Run periodic gauge capability checks on critical characteristics.