Repeatability ≤ 3 µm
Core specification of Hanna HR®: when replacing the insert, the finished diameter varies by less than 3 µm — eliminating the need for presetting and zero reset.
Repeatability is guaranteed by the combination of: ground insert seat, M4 screws retorqued to 22.5 N·m, and HSK/BT taper that maintains the tool's position in the spindle. Result: edge change without adjustment.
Production case: biela-automotiva — 2,000 parts between adjustments, 3 µm cylindricity, 2 µm hole tolerance.