Hollow-shaft rotary table with timing-belt drive and Ezi-SERVO ST: precise 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 varying load inertia.
Mechanics
The low-backlash involute timing belt achieves a repeatability of ±30 arcsec (≈ 0.008°) and runs quietly. A ball-bearing output table and carbon-steel timing pulleys make the unit rigid and wear-resistant. The drive pulley has its own bearings, so the motor shaft carries no belt forces – extending service life. Frame sizes 60, 85 and 130 mm with hollow shaft Ø27, Ø37 and Ø55 mm, reduction ratio 1:5 and up to 12.8 N·m permissible 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.
