Hollow-shaft rotary table with precision gearbox and Ezi-SERVO ST: high-accuracy positioning, cables, hoses or optics routed straight through the axis of rotation, and controlled via pulse/direction from any PLC or motion controller – for indexing tables and rotary axes with demanding accuracy and load requirements.
Mechanics
The low-backlash precision gearbox achieves a repeatability of ±10 arcsec (≈ 0.003°). With no belts or pulleys, there is no re-tensioning – the unit is low-maintenance. On HG130S and HG170S a crossed roller bearing supports the output table and handles high axial and moment loads. Frame sizes 60, 100, 130 and 170 mm with hollow shaft Ø20 to Ø85 mm, reduction ratios from 1:5 to 1:36 and up to 170 N·m permissible torque. The HG170S is also available with an 86 mm motor for up to 107 N·m holding torque. A home sensor set (NPN or PNP) is available as an option.
Control
The Ezi-SERVO operates in closed loop: no lost steps, no hunting at standstill, no gain tuning required. The axis follows the pulse commands of the controller immediately, without the settling time of conventional servo systems – even with rapid load changes. No fieldbus is needed: cabling is limited to I/O signal, encoder, motor and power cables.
