³Ô¹Ïtv / ENGINEERING EXPLANATIONWorked example and model boundaryILLUSTRATIVE INPUTDepth 1.60 mm; declared diameter 0.20 mmAspect ratio = relevant depth / declared diameter8:1 under the stated basisChanging the diameter basis to 0.25 mm changes the same-depth ratio to 6.4:1.This example is a model explanation, not a quoted limit or an approval.Conceptual diagram, not to scale. Dimensions and examples are not manufacturing limits.