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Tag bore inspection
Reducing Probe Lobing Error on Curved Features (Without Turning Your CMM into a Guessing Machine)
If you’ve ever measured a bore, a sphere, or a nice smooth radius and thought:
“Why does this ‘perfect’ curve look slightly… three-lobed?”
You’re not imagining things. That pattern often comes from lobing error—a direction-dependent trigger behavior common in kinematic (mechanical-switch) touch-trigger probes. In plain terms: the probe doesn’t trigger at the exact same deflection in every direction, so the measured surface can come out with a subtle “triangular / three-lobe” signature.