The three numbers that decide a rotary table
A high-precision rotary table is the angle reference in five-axis machining, measurement, and semiconductor work. For a hydrostatic table, buyers should compare three hard numbers: axial and radial runout, positioning accuracy in arc-seconds, and repeatability in nanometres.
Runout
Axial and radial runout set the roundness of the machined face and the flatness of end surfaces. A good hydrostatic table holds axial runout around 0.1 μm and radial runout around 0.15 μm.
Positioning accuracy
Positioning is measured in arc-seconds (1 arcsec ≈ 4.85 μrad). High-precision tables reach roughly ±1 arcsec. That is the number that matters when a feature must land at an exact angle.
Repeatability
Repeatability, given in nanometres, shows how consistently the table returns to the same angle. Top tables sit around ±0.2–0.3 μm.
Build forms
4th and 5th axis tables, direct-drive tables, and milling, turning, or grinding tables, plus rotary swivel and measuring tables.
Typical capability
| Parameter | Typical capability |
|---|---|
| Axial runout | ≤ 0.1 μm |
| Radial runout | ≤ 0.15 μm |
| Positioning accuracy | ±1 arcsec class |
| Repeatability | ±0.2–0.3 μm class |
| Drive | Direct drive / worm gear |
| Table diameter | Per model |
Where they go
Five-axis machining centers, semiconductor lithography and bonding, optical polishing, medical implant machining, and aero-engine blade production.
Get a matched table
Tell us your axis count (4th/5th), load, and positioning need. We match a direct-drive or worm-gear solution and send a confirmed spec sheet. Related: hydrostatic spindles and the hydrostatic range.