Roundness testers must rotate the part or stylus with near-zero runout. Hydrostatic spindles supply the sub-micron, drift-free rotation that true roundness measurement requires.
Прибор сравнивает профиль с идеалом. Биение оси само ложится в результат. Ось должна быть почти идеальной.
Биение ≤0,1 мкм, нет ползучести и дрейфа — идеальная ось для контроля круглости.
Плёнка не изнашивается — эталон стабилен годами.
Máy so sánh profile với hình tròn lý tưởng. Biên trục lẫn vào kết quả. Trục phải gần hoàn hảo.
Biên ≤0,1 μm, không bò, không trôi — trục chuẩn lý tưởng cho đo độ tròn.
Màng không mòn — chuẩn ổn định nhiều năm.
La machine compare le profil à l'idéal. Le défaut propre de l'axe fausse le résultat. L'axe doit être quasi parfait.
Défaut ≤0,1 μm, sans rampement ni dérive—axe de référence idéal pour la mesure de rondeur.
Le film ne s'use pas—la référence reste stable des années.
Das Gerät vergleicht das Profil mit dem Ideal. Eigenrundlauf verfälscht das Ergebnis. Die Achse muss nahezu perfekt sein.
Rundlauf ≤0,1 μm, kein Kriechen, keine Drift—ideale Referenzachse für Rundheitsmessgeräte.
Der Film verschleißt nicht—die Referenz bleibt jahrelang stabil.
A roundness measuring instrument compares the part's profile against an ideal circle. If the rotating axis itself has runout, that error is measured as if it were the part's—corrupting the result. The reference rotation must be near perfect.
A hydrostatic spindle provides radial runout at or below 0.1 μm with no low-speed crawl and no thermal drift. That makes it an ideal reference axis for roundness testers, where the instrument's own error budget must be a tiny fraction of the tolerance being checked.
Because the film does not wear, the tester's reference accuracy stays constant for years, avoiding the creeping measurement error that wears mechanical spindles introduce.
