Hollow-shaft rotary table with timing-belt drive and Ezi-SERVO II EtherCAT: precise positioning, cables, hoses or optics routed straight through the axis of rotation, and integrated into the machine control via EtherCAT – 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. It connects via EtherCAT using the standard CiA 402 profile, so the axis works with common EtherCAT masters, including positioning, homing and cyclic synchronous operation. Cable lengths of up to 100 m between nodes are possible.
